gdb/procfs.c

gdb/procfs.c - gdb

Source code

/* Machine independent support for SVR4 /proc (process file system) for GDB.



   Copyright (C) 1999-2015 Free Software Foundation, Inc.



   Written by Michael Snyder at Cygnus Solutions.

   Based on work by Fred Fish, Stu Grossman, Geoff Noer, and others.



   This file is part of GDB.



   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.



   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.



   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */



#include "defs.h"

#include "inferior.h"

#include "infrun.h"

#include "target.h"

#include "gdbcore.h"

#include "elf-bfd.h"                /* for elfcore_write_* */

#include "gdbcmd.h"

#include "gdbthread.h"

#include "regcache.h"

#include "inf-child.h"



#if defined (NEW_PROC_API)

‌#define _STRUCTURED_PROC 1        /* Should be done by configure script.  */

#endif



#include <sys/procfs.h>

#ifdef HAVE_SYS_FAULT_H

#include <sys/fault.h>

#endif

#ifdef HAVE_SYS_SYSCALL_H

#include <sys/syscall.h>

#endif

#include "gdb_wait.h"

#include <signal.h>

#include <ctype.h>

#include "gdb_bfd.h"

#include "inflow.h"

#include "auxv.h"

#include "procfs.h"

#include "observer.h"



/* This module provides the interface between GDB and the

   /proc file system, which is used on many versions of Unix

   as a means for debuggers to control other processes.



   Examples of the systems that use this interface are:



     Irix

     Solaris

     OSF

     AIX5



   /proc works by imitating a file system: you open a simulated file

   that represents the process you wish to interact with, and perform

   operations on that "file" in order to examine or change the state

   of the other process.



   The most important thing to know about /proc and this module is

   that there are two very different interfaces to /proc:



     One that uses the ioctl system call, and another that uses read

     and write system calls.



   This module has to support both /proc interfaces.  This means that

   there are two different ways of doing every basic operation.



   In order to keep most of the code simple and clean, I have defined

   an interface "layer" which hides all these system calls.  An ifdef

   (NEW_PROC_API) determines which interface we are using, and most or

   all occurrances of this ifdef should be confined to this interface

   layer.  */



/* Determine which /proc API we are using: The ioctl API defines

   PIOCSTATUS, while the read/write (multiple fd) API never does.  */



#ifdef NEW_PROC_API

#include <sys/types.h>

#include <dirent.h>        /* opendir/readdir, for listing the LWP's */

#endif



#include <fcntl.h>        /* for O_RDONLY */

#include <unistd.h>        /* for "X_OK" */

#include <sys/stat.h>        /* for struct stat */



/* Note: procfs-utils.h must be included after the above system header

   files, because it redefines various system calls using macros.

   This may be incompatible with the prototype declarations.  */



#include "proc-utils.h"



/* Prototypes for supply_gregset etc.  */

#include "gregset.h"



/* =================== TARGET_OPS "MODULE" =================== */



/* This module defines the GDB target vector and its methods.  */



static void procfs_attach (struct target_ops *, const char *, int);

static void procfs_detach (struct target_ops *, const char *, int);

static void procfs_resume (struct target_ops *,

                           ptid_t, int, enum gdb_signal);

static void procfs_stop (struct target_ops *self, ptid_t);

static void procfs_files_info (struct target_ops *);

static void procfs_fetch_registers (struct target_ops *,

                                    struct regcache *, int);

static void procfs_store_registers (struct target_ops *,

                                    struct regcache *, int);

static void procfs_pass_signals (struct target_ops *self,

                                 int, unsigned char *);

static void procfs_kill_inferior (struct target_ops *ops);

static void procfs_mourn_inferior (struct target_ops *ops);

static void procfs_create_inferior (struct target_ops *, char *,

                                    char *, char **, int);

static ptid_t procfs_wait (struct target_ops *,

                           ptid_t, struct target_waitstatus *, int);

static enum target_xfer_status procfs_xfer_memory (gdb_byte *,

                                                   const gdb_byte *,

                                                   ULONGEST, ULONGEST,

                                                   ULONGEST *);

‌static target_xfer_partial_ftype procfs_xfer_partial;



static int procfs_thread_alive (struct target_ops *ops, ptid_t);



static void procfs_update_thread_list (struct target_ops *ops);

static char *procfs_pid_to_str (struct target_ops *, ptid_t);



static int proc_find_memory_regions (struct target_ops *self,

                                     find_memory_region_ftype, void *);



static char * procfs_make_note_section (struct target_ops *self,

                                        bfd *, int *);



static int procfs_can_use_hw_breakpoint (struct target_ops *self,

                                         int, int, int);



static void procfs_info_proc (struct target_ops *, const char *,

                              enum info_proc_what);



#if defined (PR_MODEL_NATIVE) && (PR_MODEL_NATIVE == PR_MODEL_LP64)

/* When GDB is built as 64-bit application on Solaris, the auxv data

   is presented in 64-bit format.  We need to provide a custom parser

   to handle that.  */

static int

‌procfs_auxv_parse (struct target_ops *ops, gdb_byte **readptr,

                   gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)

{

  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());

  gdb_byte *ptr = *readptr;



  if (endptr == ptr)

    return 0;



  if (endptr - ptr < 8 * 2)

    return -1;



  *typep = extract_unsigned_integer (ptr, 4, byte_order);

  ptr += 8;

  /* The size of data is always 64-bit.  If the application is 32-bit,

     it will be zero extended, as expected.  */

  *valp = extract_unsigned_integer (ptr, 8, byte_order);

  ptr += 8;



  *readptr = ptr;

  return 1;

}

#endif



struct target_ops *

‌procfs_target (void)

{

  struct target_ops *t = inf_child_target ();



  t->to_create_inferior = procfs_create_inferior;

  t->to_kill = procfs_kill_inferior;

  t->to_mourn_inferior = procfs_mourn_inferior;

  t->to_attach = procfs_attach;

  t->to_detach = procfs_detach;

  t->to_wait = procfs_wait;

  t->to_resume = procfs_resume;

  t->to_fetch_registers = procfs_fetch_registers;

  t->to_store_registers = procfs_store_registers;

  t->to_xfer_partial = procfs_xfer_partial;

  t->to_pass_signals = procfs_pass_signals;

  t->to_files_info = procfs_files_info;

  t->to_stop = procfs_stop;



  t->to_update_thread_list = procfs_update_thread_list;

  t->to_thread_alive = procfs_thread_alive;

  t->to_pid_to_str = procfs_pid_to_str;



  t->to_has_thread_control = tc_schedlock;

  t->to_find_memory_regions = proc_find_memory_regions;

  t->to_make_corefile_notes = procfs_make_note_section;

  t->to_info_proc = procfs_info_proc;



#if defined(PR_MODEL_NATIVE) && (PR_MODEL_NATIVE == PR_MODEL_LP64)

  t->to_auxv_parse = procfs_auxv_parse;

#endif



  t->to_magic = OPS_MAGIC;



  return t;

}



/* =================== END, TARGET_OPS "MODULE" =================== */



/* World Unification:



   Put any typedefs, defines etc. here that are required for the

   unification of code that handles different versions of /proc.  */



#ifdef NEW_PROC_API                /* Solaris 7 && 8 method for watchpoints */

#ifdef WA_READ

     enum { READ_WATCHFLAG  = WA_READ,

            WRITE_WATCHFLAG = WA_WRITE,

            EXEC_WATCHFLAG  = WA_EXEC,

            AFTER_WATCHFLAG = WA_TRAPAFTER

     };

#endif

#else                                /* Irix method for watchpoints */

     enum { READ_WATCHFLAG  = MA_READ,

            WRITE_WATCHFLAG = MA_WRITE,

            EXEC_WATCHFLAG  = MA_EXEC,

            AFTER_WATCHFLAG = 0                /* trapafter not implemented */

     };

#endif



/* gdb_sigset_t */

#ifdef HAVE_PR_SIGSET_T

‌typedef pr_sigset_t gdb_sigset_t;

#else

‌typedef sigset_t gdb_sigset_t;

#endif



/* sigaction */

#ifdef HAVE_PR_SIGACTION64_T

‌typedef pr_sigaction64_t gdb_sigaction_t;

#else

‌typedef struct sigaction gdb_sigaction_t;

#endif



/* siginfo */

#ifdef HAVE_PR_SIGINFO64_T

‌typedef pr_siginfo64_t gdb_siginfo_t;

#else

‌typedef siginfo_t gdb_siginfo_t;

#endif



/* On mips-irix, praddset and prdelset are defined in such a way that

   they return a value, which causes GCC to emit a -Wunused error

   because the returned value is not used.  Prevent this warning

   by casting the return value to void.  On sparc-solaris, this issue

   does not exist because the definition of these macros already include

   that cast to void.  */

‌#define gdb_praddset(sp, flag) ((void) praddset (sp, flag))

‌#define gdb_prdelset(sp, flag) ((void) prdelset (sp, flag))



/* gdb_premptysysset */

#ifdef premptysysset

‌#define gdb_premptysysset premptysysset

#else

‌#define gdb_premptysysset premptyset

#endif



/* praddsysset */

#ifdef praddsysset

‌#define gdb_praddsysset praddsysset

#else

‌#define gdb_praddsysset gdb_praddset

#endif



/* prdelsysset */

#ifdef prdelsysset

‌#define gdb_prdelsysset prdelsysset

#else

‌#define gdb_prdelsysset gdb_prdelset

#endif



/* prissyssetmember */

#ifdef prissyssetmember

‌#define gdb_pr_issyssetmember prissyssetmember

#else

‌#define gdb_pr_issyssetmember prismember

#endif



/* As a feature test, saying ``#if HAVE_PRSYSENT_T'' everywhere isn't

   as intuitively descriptive as it could be, so we'll define

   DYNAMIC_SYSCALLS to mean the same thing.  Anyway, at the time of

   this writing, this feature is only found on AIX5 systems and

   basically means that the set of syscalls is not fixed.  I.e,

   there's no nice table that one can #include to get all of the

   syscall numbers.  Instead, they're stored in /proc/PID/sysent

   for each process.  We are at least guaranteed that they won't

   change over the lifetime of the process.  But each process could

   (in theory) have different syscall numbers.  */

#ifdef HAVE_PRSYSENT_T

‌#define DYNAMIC_SYSCALLS

#endif







/* =================== STRUCT PROCINFO "MODULE" =================== */



     /* FIXME: this comment will soon be out of date W.R.T. threads.  */



/* The procinfo struct is a wrapper to hold all the state information

   concerning a /proc process.  There should be exactly one procinfo

   for each process, and since GDB currently can debug only one

   process at a time, that means there should be only one procinfo.

   All of the LWP's of a process can be accessed indirectly thru the

   single process procinfo.



   However, against the day when GDB may debug more than one process,

   this data structure is kept in a list (which for now will hold no

   more than one member), and many functions will have a pointer to a

   procinfo as an argument.



   There will be a separate procinfo structure for use by the (not yet

   implemented) "info proc" command, so that we can print useful

   information about any random process without interfering with the

   inferior's procinfo information.  */



#ifdef NEW_PROC_API

/* format strings for /proc paths */

# ifndef CTL_PROC_NAME_FMT

‌#  define MAIN_PROC_NAME_FMT   "/proc/%d"

‌#  define CTL_PROC_NAME_FMT    "/proc/%d/ctl"

‌#  define AS_PROC_NAME_FMT     "/proc/%d/as"

‌#  define MAP_PROC_NAME_FMT    "/proc/%d/map"

‌#  define STATUS_PROC_NAME_FMT "/proc/%d/status"

‌#  define MAX_PROC_NAME_SIZE sizeof("/proc/99999/lwp/8096/lstatus")

# endif

/* the name of the proc status struct depends on the implementation */

‌typedef pstatus_t   gdb_prstatus_t;

‌typedef lwpstatus_t gdb_lwpstatus_t;

#else /* ! NEW_PROC_API */

/* format strings for /proc paths */

# ifndef CTL_PROC_NAME_FMT

‌#  define MAIN_PROC_NAME_FMT   "/proc/%05d"

‌#  define CTL_PROC_NAME_FMT    "/proc/%05d"

‌#  define AS_PROC_NAME_FMT     "/proc/%05d"

‌#  define MAP_PROC_NAME_FMT    "/proc/%05d"

‌#  define STATUS_PROC_NAME_FMT "/proc/%05d"

‌#  define MAX_PROC_NAME_SIZE sizeof("/proc/ttttppppp")

# endif

/* The name of the proc status struct depends on the implementation.  */

‌typedef prstatus_t gdb_prstatus_t;

‌typedef prstatus_t gdb_lwpstatus_t;

#endif /* NEW_PROC_API */



‌typedef struct procinfo {

  struct procinfo *next;

  int pid;                        /* Process ID    */

  int tid;                        /* Thread/LWP id */



  /* process state */

  int was_stopped;

  int ignore_next_sigstop;



  /* The following four fd fields may be identical, or may contain

     several different fd's, depending on the version of /proc

     (old ioctl or new read/write).  */



  int ctl_fd;                        /* File descriptor for /proc control file */



  /* The next three file descriptors are actually only needed in the

     read/write, multiple-file-descriptor implemenation

     (NEW_PROC_API).  However, to avoid a bunch of #ifdefs in the

     code, we will use them uniformly by (in the case of the ioctl

     single-file-descriptor implementation) filling them with copies

     of the control fd.  */

  int status_fd;                /* File descriptor for /proc status file */

  int as_fd;                        /* File descriptor for /proc as file */



  char pathname[MAX_PROC_NAME_SIZE];        /* Pathname to /proc entry */



  fltset_t saved_fltset;        /* Saved traced hardware fault set */

  gdb_sigset_t saved_sigset;        /* Saved traced signal set */

  gdb_sigset_t saved_sighold;        /* Saved held signal set */

  sysset_t *saved_exitset;        /* Saved traced system call exit set */

  sysset_t *saved_entryset;        /* Saved traced system call entry set */



  gdb_prstatus_t prstatus;        /* Current process status info */



#ifndef NEW_PROC_API

  gdb_fpregset_t fpregset;        /* Current floating point registers */

#endif



#ifdef DYNAMIC_SYSCALLS

  int num_syscalls;                /* Total number of syscalls */

  char **syscall_names;                /* Syscall number to name map */

#endif



  struct procinfo *thread_list;



  int status_valid : 1;

  int gregs_valid  : 1;

  int fpregs_valid : 1;

  int threads_valid: 1;

‌} procinfo;



‌static char errmsg[128];        /* shared error msg buffer */



/* Function prototypes for procinfo module: */



static procinfo *find_procinfo_or_die (int pid, int tid);

static procinfo *find_procinfo (int pid, int tid);

static procinfo *create_procinfo (int pid, int tid);

static void destroy_procinfo (procinfo * p);

static void do_destroy_procinfo_cleanup (void *);

static void dead_procinfo (procinfo * p, char *msg, int killp);

static int open_procinfo_files (procinfo * p, int which);

static void close_procinfo_files (procinfo * p);

static int sysset_t_size (procinfo *p);

static sysset_t *sysset_t_alloc (procinfo * pi);

#ifdef DYNAMIC_SYSCALLS

static void load_syscalls (procinfo *pi);

static void free_syscalls (procinfo *pi);

static int find_syscall (procinfo *pi, char *name);

#endif /* DYNAMIC_SYSCALLS */



static int iterate_over_mappings

  (procinfo *pi, find_memory_region_ftype child_func, void *data,

   int (*func) (struct prmap *map, find_memory_region_ftype child_func,

                void *data));



/* The head of the procinfo list: */

‌static procinfo * procinfo_list;



/* Search the procinfo list.  Return a pointer to procinfo, or NULL if

   not found.  */



static procinfo *

‌find_procinfo (int pid, int tid)

{

  procinfo *pi;



  for (pi = procinfo_list; pi; pi = pi->next)

    if (pi->pid == pid)

      break;



  if (pi)

    if (tid)

      {

        /* Don't check threads_valid.  If we're updating the

           thread_list, we want to find whatever threads are already

           here.  This means that in general it is the caller's

           responsibility to check threads_valid and update before

           calling find_procinfo, if the caller wants to find a new

           thread.  */



        for (pi = pi->thread_list; pi; pi = pi->next)

          if (pi->tid == tid)

            break;

      }



  return pi;

}



/* Calls find_procinfo, but errors on failure.  */



static procinfo *

‌find_procinfo_or_die (int pid, int tid)

{

  procinfo *pi = find_procinfo (pid, tid);



  if (pi == NULL)

    {

      if (tid)

        error (_("procfs: couldn't find pid %d "

                 "(kernel thread %d) in procinfo list."),

               pid, tid);

      else

        error (_("procfs: couldn't find pid %d in procinfo list."), pid);

    }

  return pi;

}



/* Wrapper for `open'.  The appropriate open call is attempted; if

   unsuccessful, it will be retried as many times as needed for the

   EAGAIN and EINTR conditions.



   For other conditions, retry the open a limited number of times.  In

   addition, a short sleep is imposed prior to retrying the open.  The

   reason for this sleep is to give the kernel a chance to catch up

   and create the file in question in the event that GDB "wins" the

   race to open a file before the kernel has created it.  */



static int

‌open_with_retry (const char *pathname, int flags)

{

  int retries_remaining, status;



  retries_remaining = 2;



  while (1)

    {

      status = open (pathname, flags);



      if (status >= 0 || retries_remaining == 0)

        break;

      else if (errno != EINTR && errno != EAGAIN)

        {

          retries_remaining--;

          sleep (1);

        }

    }



  return status;

}



/* Open the file descriptor for the process or LWP.  If NEW_PROC_API

   is defined, we only open the control file descriptor; the others

   are opened lazily as needed.  Otherwise (if not NEW_PROC_API),

   there is only one real file descriptor, but we keep multiple copies

   of it so that the code that uses them does not have to be #ifdef'd.

   Returns the file descriptor, or zero for failure.  */



enum { FD_CTL, FD_STATUS, FD_AS };



static int

‌open_procinfo_files (procinfo *pi, int which)

{

#ifdef NEW_PROC_API

  char tmp[MAX_PROC_NAME_SIZE];

#endif

  int  fd;



  /* This function is getting ALMOST long enough to break up into

     several.  Here is some rationale:



     NEW_PROC_API (Solaris 2.6, Solaris 2.7):

     There are several file descriptors that may need to be open

       for any given process or LWP.  The ones we're intereted in are:

         - control         (ctl)          write-only        change the state

         - status         (status) read-only        query the state

         - address space (as)          read/write        access memory

         - map                 (map)          read-only        virtual addr map

       Most of these are opened lazily as they are needed.

       The pathnames for the 'files' for an LWP look slightly

       different from those of a first-class process:

         Pathnames for a process (<proc-id>):

           /proc/<proc-id>/ctl

           /proc/<proc-id>/status

           /proc/<proc-id>/as

           /proc/<proc-id>/map

         Pathnames for an LWP (lwp-id):

           /proc/<proc-id>/lwp/<lwp-id>/lwpctl

           /proc/<proc-id>/lwp/<lwp-id>/lwpstatus

       An LWP has no map or address space file descriptor, since

       the memory map and address space are shared by all LWPs.



     Everyone else (Solaris 2.5, Irix, OSF)

       There is only one file descriptor for each process or LWP.

       For convenience, we copy the same file descriptor into all

       three fields of the procinfo struct (ctl_fd, status_fd, and

       as_fd, see NEW_PROC_API above) so that code that uses them

       doesn't need any #ifdef's.

         Pathname for all:

           /proc/<proc-id>



       Solaris 2.5 LWP's:

         Each LWP has an independent file descriptor, but these

         are not obtained via the 'open' system call like the rest:

         instead, they're obtained thru an ioctl call (PIOCOPENLWP)

         to the file descriptor of the parent process.



       OSF threads:

         These do not even have their own independent file descriptor.

         All operations are carried out on the file descriptor of the

         parent process.  Therefore we just call open again for each

         thread, getting a new handle for the same 'file'.  */



#ifdef NEW_PROC_API

  /* In this case, there are several different file descriptors that

     we might be asked to open.  The control file descriptor will be

     opened early, but the others will be opened lazily as they are

     needed.  */



  strcpy (tmp, pi->pathname);

  switch (which) {        /* Which file descriptor to open?  */

  case FD_CTL:

    if (pi->tid)

      strcat (tmp, "/lwpctl");

    else

      strcat (tmp, "/ctl");

    fd = open_with_retry (tmp, O_WRONLY);

    if (fd < 0)

      return 0;                /* fail */

    pi->ctl_fd = fd;

    break;

  case FD_AS:

    if (pi->tid)

      return 0;                /* There is no 'as' file descriptor for an lwp.  */

    strcat (tmp, "/as");

    fd = open_with_retry (tmp, O_RDWR);

    if (fd < 0)

      return 0;                /* fail */

    pi->as_fd = fd;

    break;

  case FD_STATUS:

    if (pi->tid)

      strcat (tmp, "/lwpstatus");

    else

      strcat (tmp, "/status");

    fd = open_with_retry (tmp, O_RDONLY);

    if (fd < 0)

      return 0;                /* fail */

    pi->status_fd = fd;

    break;

  default:

    return 0;                /* unknown file descriptor */

  }

#else  /* not NEW_PROC_API */

  /* In this case, there is only one file descriptor for each procinfo

     (ie. each process or LWP).  In fact, only the file descriptor for

     the process can actually be opened by an 'open' system call.  The

     ones for the LWPs have to be obtained thru an IOCTL call on the

     process's file descriptor.



     For convenience, we copy each procinfo's single file descriptor

     into all of the fields occupied by the several file descriptors

     of the NEW_PROC_API implementation.  That way, the code that uses

     them can be written without ifdefs.  */





#ifdef PIOCTSTATUS        /* OSF */

  /* Only one FD; just open it.  */

  if ((fd = open_with_retry (pi->pathname, O_RDWR)) < 0)

    return 0;

#else                        /* Sol 2.5, Irix, other?  */

  if (pi->tid == 0)        /* Master procinfo for the process */

    {

      fd = open_with_retry (pi->pathname, O_RDWR);

      if (fd < 0)

        return 0;        /* fail */

    }

  else                        /* LWP thread procinfo */

    {

#ifdef PIOCOPENLWP        /* Sol 2.5, thread/LWP */

      procinfo *process;

      int lwpid = pi->tid;



      /* Find the procinfo for the entire process.  */

      if ((process = find_procinfo (pi->pid, 0)) == NULL)

        return 0;        /* fail */



      /* Now obtain the file descriptor for the LWP.  */

      if ((fd = ioctl (process->ctl_fd, PIOCOPENLWP, &lwpid)) < 0)

        return 0;        /* fail */

#else                        /* Irix, other?  */

      return 0;                /* Don't know how to open threads.  */

#endif        /* Sol 2.5 PIOCOPENLWP */

    }

#endif        /* OSF     PIOCTSTATUS */

  pi->ctl_fd = pi->as_fd = pi->status_fd = fd;

#endif        /* NEW_PROC_API */



  return 1;                /* success */

}



/* Allocate a data structure and link it into the procinfo list.

   First tries to find a pre-existing one (FIXME: why?).  Returns the

   pointer to new procinfo struct.  */



static procinfo *

‌create_procinfo (int pid, int tid)

{

  procinfo *pi, *parent = NULL;



  if ((pi = find_procinfo (pid, tid)))

    return pi;                        /* Already exists, nothing to do.  */



  /* Find parent before doing malloc, to save having to cleanup.  */

  if (tid != 0)

    parent = find_procinfo_or_die (pid, 0);        /* FIXME: should I

                                                   create it if it

                                                   doesn't exist yet?  */



  pi = (procinfo *) xmalloc (sizeof (procinfo));

  memset (pi, 0, sizeof (procinfo));

  pi->pid = pid;

  pi->tid = tid;



#ifdef DYNAMIC_SYSCALLS

  load_syscalls (pi);

#endif



  pi->saved_entryset = sysset_t_alloc (pi);

  pi->saved_exitset = sysset_t_alloc (pi);



  /* Chain into list.  */

  if (tid == 0)

    {

      sprintf (pi->pathname, MAIN_PROC_NAME_FMT, pid);

      pi->next = procinfo_list;

      procinfo_list = pi;

    }

  else

    {

#ifdef NEW_PROC_API

      sprintf (pi->pathname, "/proc/%05d/lwp/%d", pid, tid);

#else

      sprintf (pi->pathname, MAIN_PROC_NAME_FMT, pid);

#endif

      pi->next = parent->thread_list;

      parent->thread_list = pi;

    }

  return pi;

}



/* Close all file descriptors associated with the procinfo.  */



static void

‌close_procinfo_files (procinfo *pi)

{

  if (pi->ctl_fd > 0)

    close (pi->ctl_fd);

#ifdef NEW_PROC_API

  if (pi->as_fd > 0)

    close (pi->as_fd);

  if (pi->status_fd > 0)

    close (pi->status_fd);

#endif

  pi->ctl_fd = pi->as_fd = pi->status_fd = 0;

}



/* Destructor function.  Close, unlink and deallocate the object.  */



static void

‌destroy_one_procinfo (procinfo **list, procinfo *pi)

{

  procinfo *ptr;



  /* Step one: unlink the procinfo from its list.  */

  if (pi == *list)

    *list = pi->next;

  else

    for (ptr = *list; ptr; ptr = ptr->next)

      if (ptr->next == pi)

        {

          ptr->next =  pi->next;

          break;

        }



  /* Step two: close any open file descriptors.  */

  close_procinfo_files (pi);



  /* Step three: free the memory.  */

#ifdef DYNAMIC_SYSCALLS

  free_syscalls (pi);

#endif

  xfree (pi->saved_entryset);

  xfree (pi->saved_exitset);

  xfree (pi);

}



static void

‌destroy_procinfo (procinfo *pi)

{

  procinfo *tmp;



  if (pi->tid != 0)        /* Destroy a thread procinfo.  */

    {

      tmp = find_procinfo (pi->pid, 0);        /* Find the parent process.  */

      destroy_one_procinfo (&tmp->thread_list, pi);

    }

  else                        /* Destroy a process procinfo and all its threads.  */

    {

      /* First destroy the children, if any; */

      while (pi->thread_list != NULL)

        destroy_one_procinfo (&pi->thread_list, pi->thread_list);

      /* Then destroy the parent.  Genocide!!!  */

      destroy_one_procinfo (&procinfo_list, pi);

    }

}



static void

‌do_destroy_procinfo_cleanup (void *pi)

{

  destroy_procinfo (pi);

}



enum { NOKILL, KILL };



/* To be called on a non_recoverable error for a procinfo.  Prints

   error messages, optionally sends a SIGKILL to the process, then

   destroys the data structure.  */



static void

‌dead_procinfo (procinfo *pi, char *msg, int kill_p)

{

  char procfile[80];



  if (pi->pathname)

    {

      print_sys_errmsg (pi->pathname, errno);

    }

  else

    {

      sprintf (procfile, "process %d", pi->pid);

      print_sys_errmsg (procfile, errno);

    }

  if (kill_p == KILL)

    kill (pi->pid, SIGKILL);



  destroy_procinfo (pi);

  error ("%s", msg);

}



/* Returns the (complete) size of a sysset_t struct.  Normally, this

   is just sizeof (sysset_t), but in the case of Monterey/64, the

   actual size of sysset_t isn't known until runtime.  */



static int

‌sysset_t_size (procinfo * pi)

{

#ifndef DYNAMIC_SYSCALLS

  return sizeof (sysset_t);

#else

  return sizeof (sysset_t) - sizeof (uint64_t)

    + sizeof (uint64_t) * ((pi->num_syscalls + (8 * sizeof (uint64_t) - 1))

                           / (8 * sizeof (uint64_t)));

#endif

}



/* Allocate and (partially) initialize a sysset_t struct.  */



static sysset_t *

‌sysset_t_alloc (procinfo * pi)

{

  sysset_t *ret;

  int size = sysset_t_size (pi);



  ret = xmalloc (size);

#ifdef DYNAMIC_SYSCALLS

  ret->pr_size = ((pi->num_syscalls + (8 * sizeof (uint64_t) - 1))

                  / (8 * sizeof (uint64_t)));

#endif

  return ret;

}



#ifdef DYNAMIC_SYSCALLS



/* Extract syscall numbers and names from /proc/<pid>/sysent.  Initialize

   pi->num_syscalls with the number of syscalls and pi->syscall_names

   with the names.  (Certain numbers may be skipped in which case the

   names for these numbers will be left as NULL.)  */



‌#define MAX_SYSCALL_NAME_LENGTH 256

‌#define MAX_SYSCALLS 65536



static void

‌load_syscalls (procinfo *pi)

{

  char pathname[MAX_PROC_NAME_SIZE];

  int sysent_fd;

  prsysent_t header;

  prsyscall_t *syscalls;

  int i, size, maxcall;

  struct cleanup *cleanups;



  pi->num_syscalls = 0;

  pi->syscall_names = 0;



  /* Open the file descriptor for the sysent file.  */

  sprintf (pathname, "/proc/%d/sysent", pi->pid);

  sysent_fd = open_with_retry (pathname, O_RDONLY);

  if (sysent_fd < 0)

    {

      error (_("load_syscalls: Can't open /proc/%d/sysent"), pi->pid);

    }

  cleanups = make_cleanup_close (sysent_fd);



  size = sizeof header - sizeof (prsyscall_t);

  if (read (sysent_fd, &header, size) != size)

    {

      error (_("load_syscalls: Error reading /proc/%d/sysent"), pi->pid);

    }



  if (header.pr_nsyscalls == 0)

    {

      error (_("load_syscalls: /proc/%d/sysent contains no syscalls!"),

             pi->pid);

    }



  size = header.pr_nsyscalls * sizeof (prsyscall_t);

  syscalls = xmalloc (size);

  make_cleanup (free_current_contents, &syscalls);



  if (read (sysent_fd, syscalls, size) != size)

    error (_("load_syscalls: Error reading /proc/%d/sysent"), pi->pid);



  /* Find maximum syscall number.  This may not be the same as

     pr_nsyscalls since that value refers to the number of entries

     in the table.  (Also, the docs indicate that some system

     call numbers may be skipped.)  */



  maxcall = syscalls[0].pr_number;



  for (i = 1; i <  header.pr_nsyscalls; i++)

    if (syscalls[i].pr_number > maxcall

        && syscalls[i].pr_nameoff > 0

        && syscalls[i].pr_number < MAX_SYSCALLS)

      maxcall = syscalls[i].pr_number;



  pi->num_syscalls = maxcall+1;

  pi->syscall_names = xmalloc (pi->num_syscalls * sizeof (char *));



  for (i = 0; i < pi->num_syscalls; i++)

    pi->syscall_names[i] = NULL;



  /* Read the syscall names in.  */

  for (i = 0; i < header.pr_nsyscalls; i++)

    {

      char namebuf[MAX_SYSCALL_NAME_LENGTH];

      int nread;

      int callnum;



      if (syscalls[i].pr_number >= MAX_SYSCALLS

          || syscalls[i].pr_number < 0

          || syscalls[i].pr_nameoff <= 0

          || (lseek (sysent_fd, (off_t) syscalls[i].pr_nameoff, SEEK_SET)

                                       != (off_t) syscalls[i].pr_nameoff))

        continue;



      nread = read (sysent_fd, namebuf, sizeof namebuf);

      if (nread <= 0)

        continue;



      callnum = syscalls[i].pr_number;



      if (pi->syscall_names[callnum] != NULL)

        {

          /* FIXME: Generate warning.  */

          continue;

        }



      namebuf[nread-1] = '\0';

      size = strlen (namebuf) + 1;

      pi->syscall_names[callnum] = xmalloc (size);

      strncpy (pi->syscall_names[callnum], namebuf, size-1);

      pi->syscall_names[callnum][size-1] = '\0';

    }



  do_cleanups (cleanups);

}



/* Free the space allocated for the syscall names from the procinfo

   structure.  */



static void

‌free_syscalls (procinfo *pi)

{

  if (pi->syscall_names)

    {

      int i;



      for (i = 0; i < pi->num_syscalls; i++)

        if (pi->syscall_names[i] != NULL)

          xfree (pi->syscall_names[i]);



      xfree (pi->syscall_names);

      pi->syscall_names = 0;

    }

}



/* Given a name, look up (and return) the corresponding syscall number.

   If no match is found, return -1.  */



static int

‌find_syscall (procinfo *pi, char *name)

{

  int i;



  for (i = 0; i < pi->num_syscalls; i++)

    {

      if (pi->syscall_names[i] && strcmp (name, pi->syscall_names[i]) == 0)

        return i;

    }

  return -1;

}

#endif



/* =================== END, STRUCT PROCINFO "MODULE" =================== */



/* ===================  /proc  "MODULE" =================== */



/* This "module" is the interface layer between the /proc system API

   and the gdb target vector functions.  This layer consists of access

   functions that encapsulate each of the basic operations that we

   need to use from the /proc API.



   The main motivation for this layer is to hide the fact that there

   are two very different implementations of the /proc API.  Rather

   than have a bunch of #ifdefs all thru the gdb target vector

   functions, we do our best to hide them all in here.  */



static long proc_flags (procinfo * pi);

static int proc_why (procinfo * pi);

static int proc_what (procinfo * pi);

static int proc_set_current_signal (procinfo * pi, int signo);

static int proc_get_current_thread (procinfo * pi);

static int proc_iterate_over_threads

  (procinfo * pi,

   int (*func) (procinfo *, procinfo *, void *),

   void *ptr);



static void

‌proc_warn (procinfo *pi, char *func, int line)

{

  sprintf (errmsg, "procfs: %s line %d, %s", func, line, pi->pathname);

  print_sys_errmsg (errmsg, errno);

}



static void

‌proc_error (procinfo *pi, char *func, int line)

{

  sprintf (errmsg, "procfs: %s line %d, %s", func, line, pi->pathname);

  perror_with_name (errmsg);

}



/* Updates the status struct in the procinfo.  There is a 'valid'

   flag, to let other functions know when this function needs to be

   called (so the status is only read when it is needed).  The status

   file descriptor is also only opened when it is needed.  Returns

   non-zero for success, zero for failure.  */



static int

‌proc_get_status (procinfo *pi)

{

  /* Status file descriptor is opened "lazily".  */

  if (pi->status_fd == 0 &&

      open_procinfo_files (pi, FD_STATUS) == 0)

    {

      pi->status_valid = 0;

      return 0;

    }



#ifdef NEW_PROC_API

  if (lseek (pi->status_fd, 0, SEEK_SET) < 0)

    pi->status_valid = 0;                        /* fail */

  else

    {

      /* Sigh... I have to read a different data structure,

         depending on whether this is a main process or an LWP.  */

      if (pi->tid)

        pi->status_valid = (read (pi->status_fd,

                                  (char *) &pi->prstatus.pr_lwp,

                                  sizeof (lwpstatus_t))

                            == sizeof (lwpstatus_t));

      else

        {

          pi->status_valid = (read (pi->status_fd,

                                    (char *) &pi->prstatus,

                                    sizeof (gdb_prstatus_t))

                              == sizeof (gdb_prstatus_t));

        }

    }

#else        /* ioctl method */

#ifdef PIOCTSTATUS        /* osf */

  if (pi->tid == 0)        /* main process */

    {

      /* Just read the danged status.  Now isn't that simple?  */

      pi->status_valid =

        (ioctl (pi->status_fd, PIOCSTATUS, &pi->prstatus) >= 0);

    }

  else

    {

      int win;

      struct {

        long pr_count;

        tid_t pr_error_thread;

        struct prstatus status;

      } thread_status;



      thread_status.pr_count = 1;

      thread_status.status.pr_tid = pi->tid;

      win = (ioctl (pi->status_fd, PIOCTSTATUS, &thread_status) >= 0);

      if (win)

        {

          memcpy (&pi->prstatus, &thread_status.status,

                  sizeof (pi->prstatus));

          pi->status_valid = 1;

        }

    }

#else

  /* Just read the danged status.  Now isn't that simple?  */

  pi->status_valid = (ioctl (pi->status_fd, PIOCSTATUS, &pi->prstatus) >= 0);

#endif

#endif



  if (pi->status_valid)

    {

      PROC_PRETTYFPRINT_STATUS (proc_flags (pi),

                                proc_why (pi),

                                proc_what (pi),

                                proc_get_current_thread (pi));

    }



  /* The status struct includes general regs, so mark them valid too.  */

  pi->gregs_valid  = pi->status_valid;

#ifdef NEW_PROC_API

  /* In the read/write multiple-fd model, the status struct includes

     the fp regs too, so mark them valid too.  */

  pi->fpregs_valid = pi->status_valid;

#endif

  return pi->status_valid;        /* True if success, false if failure.  */

}



/* Returns the process flags (pr_flags field).  */



static long

‌proc_flags (procinfo *pi)

{

  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return 0;        /* FIXME: not a good failure value (but what is?)  */



#ifdef NEW_PROC_API

  return pi->prstatus.pr_lwp.pr_flags;

#else

  return pi->prstatus.pr_flags;

#endif

}



/* Returns the pr_why field (why the process stopped).  */



static int

‌proc_why (procinfo *pi)

{

  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return 0;        /* FIXME: not a good failure value (but what is?)  */



#ifdef NEW_PROC_API

  return pi->prstatus.pr_lwp.pr_why;

#else

  return pi->prstatus.pr_why;

#endif

}



/* Returns the pr_what field (details of why the process stopped).  */



static int

‌proc_what (procinfo *pi)

{

  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return 0;        /* FIXME: not a good failure value (but what is?)  */



#ifdef NEW_PROC_API

  return pi->prstatus.pr_lwp.pr_what;

#else

  return pi->prstatus.pr_what;

#endif

}



/* This function is only called when PI is stopped by a watchpoint.

   Assuming the OS supports it, write to *ADDR the data address which

   triggered it and return 1.  Return 0 if it is not possible to know

   the address.  */



static int

‌proc_watchpoint_address (procinfo *pi, CORE_ADDR *addr)

{

  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return 0;



#ifdef NEW_PROC_API

  *addr = (CORE_ADDR) gdbarch_pointer_to_address (target_gdbarch (),

            builtin_type (target_gdbarch ())->builtin_data_ptr,

            (gdb_byte *) &pi->prstatus.pr_lwp.pr_info.si_addr);

#else

  *addr = (CORE_ADDR) gdbarch_pointer_to_address (target_gdbarch (),

            builtin_type (target_gdbarch ())->builtin_data_ptr,

            (gdb_byte *) &pi->prstatus.pr_info.si_addr);

#endif

  return 1;

}



#ifndef PIOCSSPCACT        /* The following is not supported on OSF.  */



/* Returns the pr_nsysarg field (number of args to the current

   syscall).  */



static int

‌proc_nsysarg (procinfo *pi)

{

  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return 0;



#ifdef NEW_PROC_API

  return pi->prstatus.pr_lwp.pr_nsysarg;

#else

  return pi->prstatus.pr_nsysarg;

#endif

}



/* Returns the pr_sysarg field (pointer to the arguments of current

   syscall).  */



static long *

‌proc_sysargs (procinfo *pi)

{

  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return NULL;



#ifdef NEW_PROC_API

  return (long *) &pi->prstatus.pr_lwp.pr_sysarg;

#else

  return (long *) &pi->prstatus.pr_sysarg;

#endif

}

#endif /* PIOCSSPCACT */



#ifdef PROCFS_DONT_PIOCSSIG_CURSIG

/* Returns the pr_cursig field (current signal).  */



static long

‌proc_cursig (struct procinfo *pi)

{

  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return 0;        /* FIXME: not a good failure value (but what is?)  */



#ifdef NEW_PROC_API

  return pi->prstatus.pr_lwp.pr_cursig;

#else

  return pi->prstatus.pr_cursig;

#endif

}

#endif /* PROCFS_DONT_PIOCSSIG_CURSIG */



/* === I appologize for the messiness of this function.

   === This is an area where the different versions of

   === /proc are more inconsistent than usual.



   Set or reset any of the following process flags:

      PR_FORK        -- forked child will inherit trace flags

      PR_RLC        -- traced process runs when last /proc file closed.

      PR_KLC    -- traced process is killed when last /proc file closed.

      PR_ASYNC        -- LWP's get to run/stop independently.



   There are three methods for doing this function:

   1) Newest: read/write [PCSET/PCRESET/PCUNSET]

      [Sol6, Sol7, UW]

   2) Middle: PIOCSET/PIOCRESET

      [Irix, Sol5]

   3) Oldest: PIOCSFORK/PIOCRFORK/PIOCSRLC/PIOCRRLC

      [OSF, Sol5]



   Note: Irix does not define PR_ASYNC.

   Note: OSF  does not define PR_KLC.

   Note: OSF  is the only one that can ONLY use the oldest method.



   Arguments:

      pi   -- the procinfo

      flag -- one of PR_FORK, PR_RLC, or PR_ASYNC

      mode -- 1 for set, 0 for reset.



   Returns non-zero for success, zero for failure.  */



enum { FLAG_RESET, FLAG_SET };



static int

‌proc_modify_flag (procinfo *pi, long flag, long mode)

{

  long win = 0;                /* default to fail */



  /* These operations affect the process as a whole, and applying them

     to an individual LWP has the same meaning as applying them to the

     main process.  Therefore, if we're ever called with a pointer to

     an LWP's procinfo, let's substitute the process's procinfo and

     avoid opening the LWP's file descriptor unnecessarily.  */



  if (pi->pid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef NEW_PROC_API        /* Newest method: Newer Solarii.  */

  /* First normalize the PCUNSET/PCRESET command opcode

     (which for no obvious reason has a different definition

     from one operating system to the next...)  */

#ifdef  PCUNSET

‌#define GDBRESET PCUNSET

#else

#ifdef  PCRESET

#define GDBRESET PCRESET

#endif

#endif

  {

    procfs_ctl_t arg[2];



    if (mode == FLAG_SET)        /* Set the flag (RLC, FORK, or ASYNC).  */

      arg[0] = PCSET;

    else                        /* Reset the flag.  */

      arg[0] = GDBRESET;



    arg[1] = flag;

    win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));

  }

#else

#ifdef PIOCSET                /* Irix/Sol5 method */

  if (mode == FLAG_SET)        /* Set the flag (hopefully RLC, FORK, or ASYNC).  */

    {

      win = (ioctl (pi->ctl_fd, PIOCSET, &flag)   >= 0);

    }

  else                        /* Reset the flag.  */

    {

      win = (ioctl (pi->ctl_fd, PIOCRESET, &flag) >= 0);

    }



#else

#ifdef PIOCSRLC                /* Oldest method: OSF */

  switch (flag) {

  case PR_RLC:

    if (mode == FLAG_SET)        /* Set run-on-last-close */

      {

        win = (ioctl (pi->ctl_fd, PIOCSRLC, NULL) >= 0);

      }

    else                        /* Clear run-on-last-close */

      {

        win = (ioctl (pi->ctl_fd, PIOCRRLC, NULL) >= 0);

      }

    break;

  case PR_FORK:

    if (mode == FLAG_SET)        /* Set inherit-on-fork */

      {

        win = (ioctl (pi->ctl_fd, PIOCSFORK, NULL) >= 0);

      }

    else                        /* Clear inherit-on-fork */

      {

        win = (ioctl (pi->ctl_fd, PIOCRFORK, NULL) >= 0);

      }

    break;

  default:

    win = 0;                /* Fail -- unknown flag (can't do PR_ASYNC).  */

    break;

  }

#endif

#endif

#endif

‌#undef GDBRESET

  /* The above operation renders the procinfo's cached pstatus

     obsolete.  */

  pi->status_valid = 0;



  if (!win)

    warning (_("procfs: modify_flag failed to turn %s %s"),

             flag == PR_FORK  ? "PR_FORK"  :

             flag == PR_RLC   ? "PR_RLC"   :

#ifdef PR_ASYNC

             flag == PR_ASYNC ? "PR_ASYNC" :

#endif

#ifdef PR_KLC

             flag == PR_KLC   ? "PR_KLC"   :

#endif

             "<unknown flag>",

             mode == FLAG_RESET ? "off" : "on");



  return win;

}



/* Set the run_on_last_close flag.  Process with all threads will

   become runnable when debugger closes all /proc fds.  Returns

   non-zero for success, zero for failure.  */



static int

‌proc_set_run_on_last_close (procinfo *pi)

{

  return proc_modify_flag (pi, PR_RLC, FLAG_SET);

}



/* Reset the run_on_last_close flag.  The process will NOT become

   runnable when debugger closes its file handles.  Returns non-zero

   for success, zero for failure.  */



static int

‌proc_unset_run_on_last_close (procinfo *pi)

{

  return proc_modify_flag (pi, PR_RLC, FLAG_RESET);

}



/* Reset inherit_on_fork flag.  If the process forks a child while we

   are registered for events in the parent, then we will NOT recieve

   events from the child.  Returns non-zero for success, zero for

   failure.  */



static int

‌proc_unset_inherit_on_fork (procinfo *pi)

{

  return proc_modify_flag (pi, PR_FORK, FLAG_RESET);

}



#ifdef PR_ASYNC

/* Set PR_ASYNC flag.  If one LWP stops because of a debug event

   (signal etc.), the remaining LWPs will continue to run.  Returns

   non-zero for success, zero for failure.  */



static int

‌proc_set_async (procinfo *pi)

{

  return proc_modify_flag (pi, PR_ASYNC, FLAG_SET);

}



/* Reset PR_ASYNC flag.  If one LWP stops because of a debug event

   (signal etc.), then all other LWPs will stop as well.  Returns

   non-zero for success, zero for failure.  */



static int

‌proc_unset_async (procinfo *pi)

{

  return proc_modify_flag (pi, PR_ASYNC, FLAG_RESET);

}

#endif /* PR_ASYNC */



/* Request the process/LWP to stop.  Does not wait.  Returns non-zero

   for success, zero for failure.  */



static int

‌proc_stop_process (procinfo *pi)

{

  int win;



  /* We might conceivably apply this operation to an LWP, and the

     LWP's ctl file descriptor might not be open.  */



  if (pi->ctl_fd == 0 &&

      open_procinfo_files (pi, FD_CTL) == 0)

    return 0;

  else

    {

#ifdef NEW_PROC_API

      procfs_ctl_t cmd = PCSTOP;



      win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));

#else        /* ioctl method */

      win = (ioctl (pi->ctl_fd, PIOCSTOP, &pi->prstatus) >= 0);

      /* Note: the call also reads the prstatus.  */

      if (win)

        {

          pi->status_valid = 1;

          PROC_PRETTYFPRINT_STATUS (proc_flags (pi),

                                    proc_why (pi),

                                    proc_what (pi),

                                    proc_get_current_thread (pi));

        }

#endif

    }



  return win;

}



/* Wait for the process or LWP to stop (block until it does).  Returns

   non-zero for success, zero for failure.  */



static int

‌proc_wait_for_stop (procinfo *pi)

{

  int win;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef NEW_PROC_API

  {

    procfs_ctl_t cmd = PCWSTOP;



    win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));

    /* We been runnin' and we stopped -- need to update status.  */

    pi->status_valid = 0;

  }

#else        /* ioctl method */

  win = (ioctl (pi->ctl_fd, PIOCWSTOP, &pi->prstatus) >= 0);

  /* Above call also refreshes the prstatus.  */

  if (win)

    {

      pi->status_valid = 1;

      PROC_PRETTYFPRINT_STATUS (proc_flags (pi),

                                proc_why (pi),

                                proc_what (pi),

                                proc_get_current_thread (pi));

    }

#endif



  return win;

}



/* Make the process or LWP runnable.



   Options (not all are implemented):

     - single-step

     - clear current fault

     - clear current signal

     - abort the current system call

     - stop as soon as finished with system call

     - (ioctl): set traced signal set

     - (ioctl): set held   signal set

     - (ioctl): set traced fault  set

     - (ioctl): set start pc (vaddr)



   Always clears the current fault.  PI is the process or LWP to

   operate on.  If STEP is true, set the process or LWP to trap after

   one instruction.  If SIGNO is zero, clear the current signal if

   any; if non-zero, set the current signal to this one.  Returns

   non-zero for success, zero for failure.  */



static int

‌proc_run_process (procinfo *pi, int step, int signo)

{

  int win;

  int runflags;



  /* We will probably have to apply this operation to individual

     threads, so make sure the control file descriptor is open.  */



  if (pi->ctl_fd == 0 &&

      open_procinfo_files (pi, FD_CTL) == 0)

    {

      return 0;

    }



  runflags    = PRCFAULT;        /* Always clear current fault.  */

  if (step)

    runflags |= PRSTEP;

  if (signo == 0)

    runflags |= PRCSIG;

  else if (signo != -1)                /* -1 means do nothing W.R.T. signals.  */

    proc_set_current_signal (pi, signo);



#ifdef NEW_PROC_API

  {

    procfs_ctl_t cmd[2];



    cmd[0]  = PCRUN;

    cmd[1]  = runflags;

    win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));

  }

#else        /* ioctl method */

  {

    prrun_t prrun;



    memset (&prrun, 0, sizeof (prrun));

    prrun.pr_flags  = runflags;

    win = (ioctl (pi->ctl_fd, PIOCRUN, &prrun) >= 0);

  }

#endif



  return win;

}



/* Register to trace signals in the process or LWP.  Returns non-zero

   for success, zero for failure.  */



static int

‌proc_set_traced_signals (procinfo *pi, gdb_sigset_t *sigset)

{

  int win;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef NEW_PROC_API

  {

    struct {

      procfs_ctl_t cmd;

      /* Use char array to avoid alignment issues.  */

      char sigset[sizeof (gdb_sigset_t)];

    } arg;



    arg.cmd = PCSTRACE;

    memcpy (&arg.sigset, sigset, sizeof (gdb_sigset_t));



    win = (write (pi->ctl_fd, (char *) &arg, sizeof (arg)) == sizeof (arg));

  }

#else        /* ioctl method */

  win = (ioctl (pi->ctl_fd, PIOCSTRACE, sigset) >= 0);

#endif

  /* The above operation renders the procinfo's cached pstatus obsolete.  */

  pi->status_valid = 0;



  if (!win)

    warning (_("procfs: set_traced_signals failed"));

  return win;

}



/* Register to trace hardware faults in the process or LWP.  Returns

   non-zero for success, zero for failure.  */



static int

‌proc_set_traced_faults (procinfo *pi, fltset_t *fltset)

{

  int win;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef NEW_PROC_API

  {

    struct {

      procfs_ctl_t cmd;

      /* Use char array to avoid alignment issues.  */

      char fltset[sizeof (fltset_t)];

    } arg;



    arg.cmd = PCSFAULT;

    memcpy (&arg.fltset, fltset, sizeof (fltset_t));



    win = (write (pi->ctl_fd, (char *) &arg, sizeof (arg)) == sizeof (arg));

  }

#else        /* ioctl method */

  win = (ioctl (pi->ctl_fd, PIOCSFAULT, fltset) >= 0);

#endif

  /* The above operation renders the procinfo's cached pstatus obsolete.  */

  pi->status_valid = 0;



  return win;

}



/* Register to trace entry to system calls in the process or LWP.

   Returns non-zero for success, zero for failure.  */



static int

‌proc_set_traced_sysentry (procinfo *pi, sysset_t *sysset)

{

  int win;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef NEW_PROC_API

  {

    struct gdb_proc_ctl_pcsentry {

      procfs_ctl_t cmd;

      /* Use char array to avoid alignment issues.  */

      char sysset[sizeof (sysset_t)];

    } *argp;

    int argp_size = sizeof (struct gdb_proc_ctl_pcsentry)

                  - sizeof (sysset_t)

                  + sysset_t_size (pi);



    argp = xmalloc (argp_size);



    argp->cmd = PCSENTRY;

    memcpy (&argp->sysset, sysset, sysset_t_size (pi));



    win = (write (pi->ctl_fd, (char *) argp, argp_size) == argp_size);

    xfree (argp);

  }

#else        /* ioctl method */

  win = (ioctl (pi->ctl_fd, PIOCSENTRY, sysset) >= 0);

#endif

  /* The above operation renders the procinfo's cached pstatus

     obsolete.  */

  pi->status_valid = 0;



  return win;

}



/* Register to trace exit from system calls in the process or LWP.

   Returns non-zero for success, zero for failure.  */



static int

‌proc_set_traced_sysexit (procinfo *pi, sysset_t *sysset)

{

  int win;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef NEW_PROC_API

  {

    struct gdb_proc_ctl_pcsexit {

      procfs_ctl_t cmd;

      /* Use char array to avoid alignment issues.  */

      char sysset[sizeof (sysset_t)];

    } *argp;

    int argp_size = sizeof (struct gdb_proc_ctl_pcsexit)

                  - sizeof (sysset_t)

                  + sysset_t_size (pi);



    argp = xmalloc (argp_size);



    argp->cmd = PCSEXIT;

    memcpy (&argp->sysset, sysset, sysset_t_size (pi));



    win = (write (pi->ctl_fd, (char *) argp, argp_size) == argp_size);

    xfree (argp);

  }

#else        /* ioctl method */

  win = (ioctl (pi->ctl_fd, PIOCSEXIT, sysset) >= 0);

#endif

  /* The above operation renders the procinfo's cached pstatus

     obsolete.  */

  pi->status_valid = 0;



  return win;

}



/* Specify the set of blocked / held signals in the process or LWP.

   Returns non-zero for success, zero for failure.  */



static int

‌proc_set_held_signals (procinfo *pi, gdb_sigset_t *sighold)

{

  int win;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef NEW_PROC_API

  {

    struct {

      procfs_ctl_t cmd;

      /* Use char array to avoid alignment issues.  */

      char hold[sizeof (gdb_sigset_t)];

    } arg;



    arg.cmd  = PCSHOLD;

    memcpy (&arg.hold, sighold, sizeof (gdb_sigset_t));

    win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));

  }

#else

  win = (ioctl (pi->ctl_fd, PIOCSHOLD, sighold) >= 0);

#endif

  /* The above operation renders the procinfo's cached pstatus

     obsolete.  */

  pi->status_valid = 0;



  return win;

}



/* Returns the set of signals that are held / blocked.  Will also copy

   the sigset if SAVE is non-zero.  */



static gdb_sigset_t *

‌proc_get_held_signals (procinfo *pi, gdb_sigset_t *save)

{

  gdb_sigset_t *ret = NULL;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef NEW_PROC_API

  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return NULL;



  ret = &pi->prstatus.pr_lwp.pr_lwphold;

#else  /* not NEW_PROC_API */

  {

    static gdb_sigset_t sigheld;



    if (ioctl (pi->ctl_fd, PIOCGHOLD, &sigheld) >= 0)

      ret = &sigheld;

  }

#endif /* NEW_PROC_API */

  if (save && ret)

    memcpy (save, ret, sizeof (gdb_sigset_t));



  return ret;

}



/* Returns the set of signals that are traced / debugged.  Will also

   copy the sigset if SAVE is non-zero.  */



static gdb_sigset_t *

‌proc_get_traced_signals (procinfo *pi, gdb_sigset_t *save)

{

  gdb_sigset_t *ret = NULL;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef NEW_PROC_API

  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return NULL;



  ret = &pi->prstatus.pr_sigtrace;

#else

  {

    static gdb_sigset_t sigtrace;



    if (ioctl (pi->ctl_fd, PIOCGTRACE, &sigtrace) >= 0)

      ret = &sigtrace;

  }

#endif

  if (save && ret)

    memcpy (save, ret, sizeof (gdb_sigset_t));



  return ret;

}



/* Returns the set of hardware faults that are traced /debugged.  Will

   also copy the faultset if SAVE is non-zero.  */



static fltset_t *

‌proc_get_traced_faults (procinfo *pi, fltset_t *save)

{

  fltset_t *ret = NULL;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef NEW_PROC_API

  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return NULL;



  ret = &pi->prstatus.pr_flttrace;

#else

  {

    static fltset_t flttrace;



    if (ioctl (pi->ctl_fd, PIOCGFAULT, &flttrace) >= 0)

      ret = &flttrace;

  }

#endif

  if (save && ret)

    memcpy (save, ret, sizeof (fltset_t));



  return ret;

}



/* Returns the set of syscalls that are traced /debugged on entry.

   Will also copy the syscall set if SAVE is non-zero.  */



static sysset_t *

‌proc_get_traced_sysentry (procinfo *pi, sysset_t *save)

{

  sysset_t *ret = NULL;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef NEW_PROC_API

  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return NULL;



#ifndef DYNAMIC_SYSCALLS

  ret = &pi->prstatus.pr_sysentry;

#else /* DYNAMIC_SYSCALLS */

  {

    static sysset_t *sysentry;

    size_t size;



    if (!sysentry)

      sysentry = sysset_t_alloc (pi);

    ret = sysentry;

    if (pi->status_fd == 0 && open_procinfo_files (pi, FD_STATUS) == 0)

      return NULL;

    if (pi->prstatus.pr_sysentry_offset == 0)

      {

        gdb_premptysysset (sysentry);

      }

    else

      {

        int rsize;



        if (lseek (pi->status_fd, (off_t) pi->prstatus.pr_sysentry_offset,

                   SEEK_SET)

            != (off_t) pi->prstatus.pr_sysentry_offset)

          return NULL;

        size = sysset_t_size (pi);

        gdb_premptysysset (sysentry);

        rsize = read (pi->status_fd, sysentry, size);

        if (rsize < 0)

          return NULL;

      }

  }

#endif /* DYNAMIC_SYSCALLS */

#else /* !NEW_PROC_API */

  {

    static sysset_t sysentry;



    if (ioctl (pi->ctl_fd, PIOCGENTRY, &sysentry) >= 0)

      ret = &sysentry;

  }

#endif /* NEW_PROC_API */

  if (save && ret)

    memcpy (save, ret, sysset_t_size (pi));



  return ret;

}



/* Returns the set of syscalls that are traced /debugged on exit.

   Will also copy the syscall set if SAVE is non-zero.  */



static sysset_t *

‌proc_get_traced_sysexit (procinfo *pi, sysset_t *save)

{

  sysset_t * ret = NULL;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef NEW_PROC_API

  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return NULL;



#ifndef DYNAMIC_SYSCALLS

  ret = &pi->prstatus.pr_sysexit;

#else /* DYNAMIC_SYSCALLS */

  {

    static sysset_t *sysexit;

    size_t size;



    if (!sysexit)

      sysexit = sysset_t_alloc (pi);

    ret = sysexit;

    if (pi->status_fd == 0 && open_procinfo_files (pi, FD_STATUS) == 0)

      return NULL;

    if (pi->prstatus.pr_sysexit_offset == 0)

      {

        gdb_premptysysset (sysexit);

      }

    else

      {

        int rsize;



        if (lseek (pi->status_fd, (off_t) pi->prstatus.pr_sysexit_offset,

                   SEEK_SET)

            != (off_t) pi->prstatus.pr_sysexit_offset)

          return NULL;

        size = sysset_t_size (pi);

        gdb_premptysysset (sysexit);

        rsize = read (pi->status_fd, sysexit, size);

        if (rsize < 0)

          return NULL;

      }

  }

#endif /* DYNAMIC_SYSCALLS */

#else

  {

    static sysset_t sysexit;



    if (ioctl (pi->ctl_fd, PIOCGEXIT, &sysexit) >= 0)

      ret = &sysexit;

  }

#endif

  if (save && ret)

    memcpy (save, ret, sysset_t_size (pi));



  return ret;

}



/* The current fault (if any) is cleared; the associated signal will

   not be sent to the process or LWP when it resumes.  Returns

   non-zero for success, zero for failure.  */



static int

‌proc_clear_current_fault (procinfo *pi)

{

  int win;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef NEW_PROC_API

  {

    procfs_ctl_t cmd = PCCFAULT;



    win = (write (pi->ctl_fd, (void *) &cmd, sizeof (cmd)) == sizeof (cmd));

  }

#else

  win = (ioctl (pi->ctl_fd, PIOCCFAULT, 0) >= 0);

#endif



  return win;

}



/* Set the "current signal" that will be delivered next to the

   process.  NOTE: semantics are different from those of KILL.  This

   signal will be delivered to the process or LWP immediately when it

   is resumed (even if the signal is held/blocked); it will NOT

   immediately cause another event of interest, and will NOT first

   trap back to the debugger.  Returns non-zero for success, zero for

   failure.  */



static int

‌proc_set_current_signal (procinfo *pi, int signo)

{

  int win;

  struct {

    procfs_ctl_t cmd;

    /* Use char array to avoid alignment issues.  */

    char sinfo[sizeof (gdb_siginfo_t)];

  } arg;

  gdb_siginfo_t mysinfo;

  ptid_t wait_ptid;

  struct target_waitstatus wait_status;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef PROCFS_DONT_PIOCSSIG_CURSIG

  /* With Alpha OSF/1 procfs, the kernel gets really confused if it

     receives a PIOCSSIG with a signal identical to the current

     signal, it messes up the current signal.  Work around the kernel

     bug.  */

  if (signo > 0 &&

      signo == proc_cursig (pi))

    return 1;           /* I assume this is a success?  */

#endif



  /* The pointer is just a type alias.  */

  get_last_target_status (&wait_ptid, &wait_status);

  if (ptid_equal (wait_ptid, inferior_ptid)

      && wait_status.kind == TARGET_WAITKIND_STOPPED

      && wait_status.value.sig == gdb_signal_from_host (signo)

      && proc_get_status (pi)

#ifdef NEW_PROC_API

      && pi->prstatus.pr_lwp.pr_info.si_signo == signo

#else

      && pi->prstatus.pr_info.si_signo == signo

#endif

      )

    /* Use the siginfo associated with the signal being

       redelivered.  */

#ifdef NEW_PROC_API

    memcpy (arg.sinfo, &pi->prstatus.pr_lwp.pr_info, sizeof (gdb_siginfo_t));

#else

    memcpy (arg.sinfo, &pi->prstatus.pr_info, sizeof (gdb_siginfo_t));

#endif

  else

    {

      mysinfo.si_signo = signo;

      mysinfo.si_code  = 0;

      mysinfo.si_pid   = getpid ();       /* ?why? */

      mysinfo.si_uid   = getuid ();       /* ?why? */

      memcpy (arg.sinfo, &mysinfo, sizeof (gdb_siginfo_t));

    }



#ifdef NEW_PROC_API

  arg.cmd = PCSSIG;

  win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg))  == sizeof (arg));

#else

  win = (ioctl (pi->ctl_fd, PIOCSSIG, (void *) &arg.sinfo) >= 0);

#endif



  return win;

}



/* The current signal (if any) is cleared, and is not sent to the

   process or LWP when it resumes.  Returns non-zero for success, zero

   for failure.  */



static int

‌proc_clear_current_signal (procinfo *pi)

{

  int win;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



#ifdef NEW_PROC_API

  {

    struct {

      procfs_ctl_t cmd;

      /* Use char array to avoid alignment issues.  */

      char sinfo[sizeof (gdb_siginfo_t)];

    } arg;

    gdb_siginfo_t mysinfo;



    arg.cmd = PCSSIG;

    /* The pointer is just a type alias.  */

    mysinfo.si_signo = 0;

    mysinfo.si_code  = 0;

    mysinfo.si_errno = 0;

    mysinfo.si_pid   = getpid ();       /* ?why? */

    mysinfo.si_uid   = getuid ();       /* ?why? */

    memcpy (arg.sinfo, &mysinfo, sizeof (gdb_siginfo_t));



    win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));

  }

#else

  win = (ioctl (pi->ctl_fd, PIOCSSIG, 0) >= 0);

#endif



  return win;

}



/* Return the general-purpose registers for the process or LWP

   corresponding to PI.  Upon failure, return NULL.  */



static gdb_gregset_t *

‌proc_get_gregs (procinfo *pi)

{

  if (!pi->status_valid || !pi->gregs_valid)

    if (!proc_get_status (pi))

      return NULL;



#ifdef NEW_PROC_API

  return &pi->prstatus.pr_lwp.pr_reg;

#else

  return &pi->prstatus.pr_reg;

#endif

}



/* Return the general-purpose registers for the process or LWP

   corresponding to PI.  Upon failure, return NULL.  */



static gdb_fpregset_t *

‌proc_get_fpregs (procinfo *pi)

{

#ifdef NEW_PROC_API

  if (!pi->status_valid || !pi->fpregs_valid)

    if (!proc_get_status (pi))

      return NULL;



  return &pi->prstatus.pr_lwp.pr_fpreg;



#else  /* not NEW_PROC_API */

  if (pi->fpregs_valid)

    return &pi->fpregset;        /* Already got 'em.  */

  else

    {

      if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0)

        {

          return NULL;

        }

      else

        {

# ifdef PIOCTGFPREG

          struct {

            long pr_count;

            tid_t pr_error_thread;

            tfpregset_t thread_1;

          } thread_fpregs;



          thread_fpregs.pr_count = 1;

          thread_fpregs.thread_1.tid = pi->tid;



          if (pi->tid == 0

              && ioctl (pi->ctl_fd, PIOCGFPREG, &pi->fpregset) >= 0)

            {

              pi->fpregs_valid = 1;

              return &pi->fpregset; /* Got 'em now!  */

            }

          else if (pi->tid != 0

                   && ioctl (pi->ctl_fd, PIOCTGFPREG, &thread_fpregs) >= 0)

            {

              memcpy (&pi->fpregset, &thread_fpregs.thread_1.pr_fpregs,

                      sizeof (pi->fpregset));

              pi->fpregs_valid = 1;

              return &pi->fpregset; /* Got 'em now!  */

            }

          else

            {

              return NULL;

            }

# else

          if (ioctl (pi->ctl_fd, PIOCGFPREG, &pi->fpregset) >= 0)

            {

              pi->fpregs_valid = 1;

              return &pi->fpregset; /* Got 'em now!  */

            }

          else

            {

              return NULL;

            }

# endif

        }

    }

#endif /* NEW_PROC_API */

}



/* Write the general-purpose registers back to the process or LWP

   corresponding to PI.  Return non-zero for success, zero for

   failure.  */



static int

‌proc_set_gregs (procinfo *pi)

{

  gdb_gregset_t *gregs;

  int win;



  gregs = proc_get_gregs (pi);

  if (gregs == NULL)

    return 0;                        /* proc_get_regs has already warned.  */



  if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0)

    {

      return 0;

    }

  else

    {

#ifdef NEW_PROC_API

      struct {

        procfs_ctl_t cmd;

        /* Use char array to avoid alignment issues.  */

        char gregs[sizeof (gdb_gregset_t)];

      } arg;



      arg.cmd = PCSREG;

      memcpy (&arg.gregs, gregs, sizeof (arg.gregs));

      win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));

#else

      win = (ioctl (pi->ctl_fd, PIOCSREG, gregs) >= 0);

#endif

    }



  /* Policy: writing the registers invalidates our cache.  */

  pi->gregs_valid = 0;

  return win;

}



/* Write the floating-pointer registers back to the process or LWP

   corresponding to PI.  Return non-zero for success, zero for

   failure.  */



static int

‌proc_set_fpregs (procinfo *pi)

{

  gdb_fpregset_t *fpregs;

  int win;



  fpregs = proc_get_fpregs (pi);

  if (fpregs == NULL)

    return 0;                        /* proc_get_fpregs has already warned.  */



  if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0)

    {

      return 0;

    }

  else

    {

#ifdef NEW_PROC_API

      struct {

        procfs_ctl_t cmd;

        /* Use char array to avoid alignment issues.  */

        char fpregs[sizeof (gdb_fpregset_t)];

      } arg;



      arg.cmd = PCSFPREG;

      memcpy (&arg.fpregs, fpregs, sizeof (arg.fpregs));

      win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));

#else

# ifdef PIOCTSFPREG

      if (pi->tid == 0)

        win = (ioctl (pi->ctl_fd, PIOCSFPREG, fpregs) >= 0);

      else

        {

          struct {

            long pr_count;

            tid_t pr_error_thread;

            tfpregset_t thread_1;

          } thread_fpregs;



          thread_fpregs.pr_count = 1;

          thread_fpregs.thread_1.tid = pi->tid;

          memcpy (&thread_fpregs.thread_1.pr_fpregs, fpregs,

                  sizeof (*fpregs));

          win = (ioctl (pi->ctl_fd, PIOCTSFPREG, &thread_fpregs) >= 0);

        }

# else

      win = (ioctl (pi->ctl_fd, PIOCSFPREG, fpregs) >= 0);

# endif

#endif /* NEW_PROC_API */

    }



  /* Policy: writing the registers invalidates our cache.  */

  pi->fpregs_valid = 0;

  return win;

}



/* Send a signal to the proc or lwp with the semantics of "kill()".

   Returns non-zero for success, zero for failure.  */



static int

‌proc_kill (procinfo *pi, int signo)

{

  int win;



  /* We might conceivably apply this operation to an LWP, and the

     LWP's ctl file descriptor might not be open.  */



  if (pi->ctl_fd == 0 &&

      open_procinfo_files (pi, FD_CTL) == 0)

    {

      return 0;

    }

  else

    {

#ifdef NEW_PROC_API

      procfs_ctl_t cmd[2];



      cmd[0] = PCKILL;

      cmd[1] = signo;

      win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));

#else   /* ioctl method */

      /* FIXME: do I need the Alpha OSF fixups present in

         procfs.c/unconditionally_kill_inferior?  Perhaps only for SIGKILL?  */

      win = (ioctl (pi->ctl_fd, PIOCKILL, &signo) >= 0);

#endif

  }



  return win;

}



/* Find the pid of the process that started this one.  Returns the

   parent process pid, or zero.  */



static int

‌proc_parent_pid (procinfo *pi)

{

  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return 0;



  return pi->prstatus.pr_ppid;

}



/* Convert a target address (a.k.a. CORE_ADDR) into a host address

   (a.k.a void pointer)!  */



#if (defined (PCWATCH) || defined (PIOCSWATCH)) \

    && !(defined (PIOCOPENLWP))

static void *

‌procfs_address_to_host_pointer (CORE_ADDR addr)

{

  struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;

  void *ptr;



  gdb_assert (sizeof (ptr) == TYPE_LENGTH (ptr_type));

  gdbarch_address_to_pointer (target_gdbarch (), ptr_type,

                              (gdb_byte *) &ptr, addr);

  return ptr;

}

#endif



static int

‌proc_set_watchpoint (procinfo *pi, CORE_ADDR addr, int len, int wflags)

{

#if !defined (PCWATCH) && !defined (PIOCSWATCH)

  /* If neither or these is defined, we can't support watchpoints.

     This just avoids possibly failing to compile the below on such

     systems.  */

  return 0;

#else

/* Horrible hack!  Detect Solaris 2.5, because this doesn't work on 2.5.  */

#if defined (PIOCOPENLWP)        /* Solaris 2.5: bail out.  */

  return 0;

#else

  struct {

    procfs_ctl_t cmd;

    char watch[sizeof (prwatch_t)];

  } arg;

  prwatch_t pwatch;



  /* NOTE: cagney/2003-02-01: Even more horrible hack.  Need to

     convert a target address into something that can be stored in a

     native data structure.  */

#ifdef PCAGENT        /* Horrible hack: only defined on Solaris 2.6+ */

  pwatch.pr_vaddr  = (uintptr_t) procfs_address_to_host_pointer (addr);

#else

  pwatch.pr_vaddr  = (caddr_t) procfs_address_to_host_pointer (addr);

#endif

  pwatch.pr_size   = len;

  pwatch.pr_wflags = wflags;

#if defined(NEW_PROC_API) && defined (PCWATCH)

  arg.cmd = PCWATCH;

  memcpy (arg.watch, &pwatch, sizeof (prwatch_t));

  return (write (pi->ctl_fd, &arg, sizeof (arg)) == sizeof (arg));

#else

#if defined (PIOCSWATCH)

  return (ioctl (pi->ctl_fd, PIOCSWATCH, &pwatch) >= 0);

#else

  return 0;        /* Fail */

#endif

#endif

#endif

#endif

}



#if (defined(__i386__) || defined(__x86_64__)) && defined (sun)



#include <sys/sysi86.h>



/* The KEY is actually the value of the lower 16 bits of the GS

   register for the LWP that we're interested in.  Returns the

   matching ssh struct (LDT entry).  */



static struct ssd *

‌proc_get_LDT_entry (procinfo *pi, int key)

{

  static struct ssd *ldt_entry = NULL;

#ifdef NEW_PROC_API

  char pathname[MAX_PROC_NAME_SIZE];

  struct cleanup *old_chain = NULL;

  int  fd;



  /* Allocate space for one LDT entry.

     This alloc must persist, because we return a pointer to it.  */

  if (ldt_entry == NULL)

    ldt_entry = (struct ssd *) xmalloc (sizeof (struct ssd));



  /* Open the file descriptor for the LDT table.  */

  sprintf (pathname, "/proc/%d/ldt", pi->pid);

  if ((fd = open_with_retry (pathname, O_RDONLY)) < 0)

    {

      proc_warn (pi, "proc_get_LDT_entry (open)", __LINE__);

      return NULL;

    }

  /* Make sure it gets closed again!  */

  old_chain = make_cleanup_close (fd);



  /* Now 'read' thru the table, find a match and return it.  */

  while (read (fd, ldt_entry, sizeof (struct ssd)) == sizeof (struct ssd))

    {

      if (ldt_entry->sel == 0 &&

          ldt_entry->bo  == 0 &&

          ldt_entry->acc1 == 0 &&

          ldt_entry->acc2 == 0)

        break;        /* end of table */

      /* If key matches, return this entry.  */

      if (ldt_entry->sel == key)

        return ldt_entry;

    }

  /* Loop ended, match not found.  */

  return NULL;

#else

  int nldt, i;

  static int nalloc = 0;



  /* Get the number of LDT entries.  */

  if (ioctl (pi->ctl_fd, PIOCNLDT, &nldt) < 0)

    {

      proc_warn (pi, "proc_get_LDT_entry (PIOCNLDT)", __LINE__);

      return NULL;

    }



  /* Allocate space for the number of LDT entries.  */

  /* This alloc has to persist, 'cause we return a pointer to it.  */

  if (nldt > nalloc)

    {

      ldt_entry = (struct ssd *)

        xrealloc (ldt_entry, (nldt + 1) * sizeof (struct ssd));

      nalloc = nldt;

    }



  /* Read the whole table in one gulp.  */

  if (ioctl (pi->ctl_fd, PIOCLDT, ldt_entry) < 0)

    {

      proc_warn (pi, "proc_get_LDT_entry (PIOCLDT)", __LINE__);

      return NULL;

    }



  /* Search the table and return the (first) entry matching 'key'.  */

  for (i = 0; i < nldt; i++)

    if (ldt_entry[i].sel == key)

      return &ldt_entry[i];



  /* Loop ended, match not found.  */

  return NULL;

#endif

}



/* Returns the pointer to the LDT entry of PTID.  */



struct ssd *

‌procfs_find_LDT_entry (ptid_t ptid)

{

  gdb_gregset_t *gregs;

  int            key;

  procinfo      *pi;



  /* Find procinfo for the lwp.  */

  if ((pi = find_procinfo (ptid_get_pid (ptid), ptid_get_lwp (ptid))) == NULL)

    {

      warning (_("procfs_find_LDT_entry: could not find procinfo for %d:%ld."),

               ptid_get_pid (ptid), ptid_get_lwp (ptid));

      return NULL;

    }

  /* get its general registers.  */

  if ((gregs = proc_get_gregs (pi)) == NULL)

    {

      warning (_("procfs_find_LDT_entry: could not read gregs for %d:%ld."),

               ptid_get_pid (ptid), ptid_get_lwp (ptid));

      return NULL;

    }

  /* Now extract the GS register's lower 16 bits.  */

  key = (*gregs)[GS] & 0xffff;



  /* Find the matching entry and return it.  */

  return proc_get_LDT_entry (pi, key);

}



#endif



/* =============== END, non-thread part of /proc  "MODULE" =============== */



/* =================== Thread "MODULE" =================== */



/* NOTE: you'll see more ifdefs and duplication of functions here,

   since there is a different way to do threads on every OS.  */



/* Returns the number of threads for the process.  */



#if defined (PIOCNTHR) && defined (PIOCTLIST)

/* OSF version */

static int

‌proc_get_nthreads (procinfo *pi)

{

  int nthreads = 0;



  if (ioctl (pi->ctl_fd, PIOCNTHR, &nthreads) < 0)

    proc_warn (pi, "procfs: PIOCNTHR failed", __LINE__);



  return nthreads;

}



#else

#if defined (SYS_lwpcreate) || defined (SYS_lwp_create) /* FIXME: multiple */

/* Solaris version */

static int

‌proc_get_nthreads (procinfo *pi)

{

  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return 0;



  /* NEW_PROC_API: only works for the process procinfo, because the

     LWP procinfos do not get prstatus filled in.  */

#ifdef NEW_PROC_API

  if (pi->tid != 0)        /* Find the parent process procinfo.  */

    pi = find_procinfo_or_die (pi->pid, 0);

#endif

  return pi->prstatus.pr_nlwp;

}



#else

/* Default version */

static int

‌proc_get_nthreads (procinfo *pi)

{

  return 0;

}

#endif

#endif



/* LWP version.



   Return the ID of the thread that had an event of interest.

   (ie. the one that hit a breakpoint or other traced event).  All

   other things being equal, this should be the ID of a thread that is

   currently executing.  */



#if defined (SYS_lwpcreate) || defined (SYS_lwp_create) /* FIXME: multiple */

/* Solaris version */

static int

‌proc_get_current_thread (procinfo *pi)

{

  /* Note: this should be applied to the root procinfo for the

     process, not to the procinfo for an LWP.  If applied to the

     procinfo for an LWP, it will simply return that LWP's ID.  In

     that case, find the parent process procinfo.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



  if (!pi->status_valid)

    if (!proc_get_status (pi))

      return 0;



#ifdef NEW_PROC_API

  return pi->prstatus.pr_lwp.pr_lwpid;

#else

  return pi->prstatus.pr_who;

#endif

}



#else

#if defined (PIOCNTHR) && defined (PIOCTLIST)

/* OSF version */

static int

‌proc_get_current_thread (procinfo *pi)

{

#if 0        /* FIXME: not ready for prime time?  */

  return pi->prstatus.pr_tid;

#else

  return 0;

#endif

}



#else

/* Default version */

static int

‌proc_get_current_thread (procinfo *pi)

{

  return 0;

}



#endif

#endif



/* Discover the IDs of all the threads within the process, and create

   a procinfo for each of them (chained to the parent).  This

   unfortunately requires a different method on every OS.  Returns

   non-zero for success, zero for failure.  */



static int

‌proc_delete_dead_threads (procinfo *parent, procinfo *thread, void *ignore)

{

  if (thread && parent)        /* sanity */

    {

      thread->status_valid = 0;

      if (!proc_get_status (thread))

        destroy_one_procinfo (&parent->thread_list, thread);

    }

  return 0;        /* keep iterating */

}



#if defined (PIOCLSTATUS)

/* Solaris 2.5 (ioctl) version */

static int

‌proc_update_threads (procinfo *pi)

{

  gdb_prstatus_t *prstatus;

  struct cleanup *old_chain = NULL;

  procinfo *thread;

  int nlwp, i;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



  proc_iterate_over_threads (pi, proc_delete_dead_threads, NULL);



  if ((nlwp = proc_get_nthreads (pi)) <= 1)

    return 1;        /* Process is not multi-threaded; nothing to do.  */



  prstatus = xmalloc (sizeof (gdb_prstatus_t) * (nlwp + 1));



  old_chain = make_cleanup (xfree, prstatus);

  if (ioctl (pi->ctl_fd, PIOCLSTATUS, prstatus) < 0)

    proc_error (pi, "update_threads (PIOCLSTATUS)", __LINE__);



  /* Skip element zero, which represents the process as a whole.  */

  for (i = 1; i < nlwp + 1; i++)

    {

      if ((thread = create_procinfo (pi->pid, prstatus[i].pr_who)) == NULL)

        proc_error (pi, "update_threads, create_procinfo", __LINE__);



      memcpy (&thread->prstatus, &prstatus[i], sizeof (*prstatus));

      thread->status_valid = 1;

    }

  pi->threads_valid = 1;

  do_cleanups (old_chain);

  return 1;

}

#else

#ifdef NEW_PROC_API

/* Solaris 6 (and later) version.  */

static void

‌do_closedir_cleanup (void *dir)

{

  closedir (dir);

}



static int

‌proc_update_threads (procinfo *pi)

{

  char pathname[MAX_PROC_NAME_SIZE + 16];

  struct dirent *direntry;

  struct cleanup *old_chain = NULL;

  procinfo *thread;

  DIR *dirp;

  int lwpid;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



  proc_iterate_over_threads (pi, proc_delete_dead_threads, NULL);



  /* Note: this brute-force method was originally devised for Unixware

     (support removed since), and will also work on Solaris 2.6 and

     2.7.  The original comment mentioned the existence of a much

     simpler and more elegant way to do this on Solaris, but didn't

     point out what that was.  */



  strcpy (pathname, pi->pathname);

  strcat (pathname, "/lwp");

  if ((dirp = opendir (pathname)) == NULL)

    proc_error (pi, "update_threads, opendir", __LINE__);



  old_chain = make_cleanup (do_closedir_cleanup, dirp);

  while ((direntry = readdir (dirp)) != NULL)

    if (direntry->d_name[0] != '.')                /* skip '.' and '..' */

      {

        lwpid = atoi (&direntry->d_name[0]);

        if ((thread = create_procinfo (pi->pid, lwpid)) == NULL)

          proc_error (pi, "update_threads, create_procinfo", __LINE__);

      }

  pi->threads_valid = 1;

  do_cleanups (old_chain);

  return 1;

}

#else

#ifdef PIOCTLIST

/* OSF version */

static int

‌proc_update_threads (procinfo *pi)

{

  int nthreads, i;

  tid_t *threads;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



  proc_iterate_over_threads (pi, proc_delete_dead_threads, NULL);



  nthreads = proc_get_nthreads (pi);

  if (nthreads < 2)

    return 0;                /* Nothing to do for 1 or fewer threads.  */



  threads = xmalloc (nthreads * sizeof (tid_t));



  if (ioctl (pi->ctl_fd, PIOCTLIST, threads) < 0)

    proc_error (pi, "procfs: update_threads (PIOCTLIST)", __LINE__);



  for (i = 0; i < nthreads; i++)

    {

      if (!find_procinfo (pi->pid, threads[i]))

        if (!create_procinfo  (pi->pid, threads[i]))

          proc_error (pi, "update_threads, create_procinfo", __LINE__);

    }

  pi->threads_valid = 1;

  return 1;

}

#else

/* Default version */

static int

‌proc_update_threads (procinfo *pi)

{

  return 0;

}

#endif        /* OSF PIOCTLIST */

#endif  /* NEW_PROC_API   */

#endif  /* SOL 2.5 PIOCLSTATUS */



/* Given a pointer to a function, call that function once for each lwp

   in the procinfo list, until the function returns non-zero, in which

   event return the value returned by the function.



   Note: this function does NOT call update_threads.  If you want to

   discover new threads first, you must call that function explicitly.

   This function just makes a quick pass over the currently-known

   procinfos.



   PI is the parent process procinfo.  FUNC is the per-thread

   function.  PTR is an opaque parameter for function.  Returns the

   first non-zero return value from the callee, or zero.  */



static int

‌proc_iterate_over_threads (procinfo *pi,

                           int (*func) (procinfo *, procinfo *, void *),

                           void *ptr)

{

  procinfo *thread, *next;

  int retval = 0;



  /* We should never have to apply this operation to any procinfo

     except the one for the main process.  If that ever changes for

     any reason, then take out the following clause and replace it

     with one that makes sure the ctl_fd is open.  */



  if (pi->tid != 0)

    pi = find_procinfo_or_die (pi->pid, 0);



  for (thread = pi->thread_list; thread != NULL; thread = next)

    {

      next = thread->next;        /* In case thread is destroyed.  */

      if ((retval = (*func) (pi, thread, ptr)) != 0)

        break;

    }



  return retval;

}



/* =================== END, Thread "MODULE" =================== */



/* =================== END, /proc  "MODULE" =================== */



/* ===================  GDB  "MODULE" =================== */



/* Here are all of the gdb target vector functions and their

   friends.  */



static ptid_t do_attach (ptid_t ptid);

static void do_detach (int signo);

static void proc_trace_syscalls_1 (procinfo *pi, int syscallnum,

                                   int entry_or_exit, int mode, int from_tty);



/* Sets up the inferior to be debugged.  Registers to trace signals,

   hardware faults, and syscalls.  Note: does not set RLC flag: caller

   may want to customize that.  Returns zero for success (note!

   unlike most functions in this module); on failure, returns the LINE

   NUMBER where it failed!  */



static int

‌procfs_debug_inferior (procinfo *pi)

{

  fltset_t traced_faults;

  gdb_sigset_t traced_signals;

  sysset_t *traced_syscall_entries;

  sysset_t *traced_syscall_exits;

  int status;



  /* Register to trace hardware faults in the child.  */

  prfillset (&traced_faults);                /* trace all faults...  */

  gdb_prdelset  (&traced_faults, FLTPAGE);        /* except page fault.  */

  if (!proc_set_traced_faults  (pi, &traced_faults))

    return __LINE__;



  /* Initially, register to trace all signals in the child.  */

  prfillset (&traced_signals);

  if (!proc_set_traced_signals (pi, &traced_signals))

    return __LINE__;





  /* Register to trace the 'exit' system call (on entry).  */

  traced_syscall_entries = sysset_t_alloc (pi);

  gdb_premptysysset (traced_syscall_entries);

#ifdef SYS_exit

  gdb_praddsysset (traced_syscall_entries, SYS_exit);

#endif

#ifdef SYS_lwpexit

  gdb_praddsysset (traced_syscall_entries, SYS_lwpexit);/* And _lwp_exit...  */

#endif

#ifdef SYS_lwp_exit

  gdb_praddsysset (traced_syscall_entries, SYS_lwp_exit);

#endif

#ifdef DYNAMIC_SYSCALLS

  {

    int callnum = find_syscall (pi, "_exit");



    if (callnum >= 0)

      gdb_praddsysset (traced_syscall_entries, callnum);

  }

#endif



  status = proc_set_traced_sysentry (pi, traced_syscall_entries);

  xfree (traced_syscall_entries);

  if (!status)

    return __LINE__;



#ifdef PRFS_STOPEXEC        /* defined on OSF */

  /* OSF method for tracing exec syscalls.  Quoting:

     Under Alpha OSF/1 we have to use a PIOCSSPCACT ioctl to trace

     exits from exec system calls because of the user level loader.  */

  /* FIXME: make nice and maybe move into an access function.  */

  {

    int prfs_flags;



    if (ioctl (pi->ctl_fd, PIOCGSPCACT, &prfs_flags) < 0)

      return __LINE__;



    prfs_flags |= PRFS_STOPEXEC;



    if (ioctl (pi->ctl_fd, PIOCSSPCACT, &prfs_flags) < 0)

      return __LINE__;

  }

#else /* not PRFS_STOPEXEC */

  /* Everyone else's (except OSF) method for tracing exec syscalls.  */

  /* GW: Rationale...

     Not all systems with /proc have all the exec* syscalls with the same

     names.  On the SGI, for example, there is no SYS_exec, but there

     *is* a SYS_execv.  So, we try to account for that.  */



  traced_syscall_exits = sysset_t_alloc (pi);

  gdb_premptysysset (traced_syscall_exits);

#ifdef SYS_exec

  gdb_praddsysset (traced_syscall_exits, SYS_exec);

#endif

#ifdef SYS_execve

  gdb_praddsysset (traced_syscall_exits, SYS_execve);

#endif

#ifdef SYS_execv

  gdb_praddsysset (traced_syscall_exits, SYS_execv);

#endif



#ifdef SYS_lwpcreate

  gdb_praddsysset (traced_syscall_exits, SYS_lwpcreate);

  gdb_praddsysset (traced_syscall_exits, SYS_lwpexit);

#endif



#ifdef SYS_lwp_create        /* FIXME: once only, please.  */

  gdb_praddsysset (traced_syscall_exits, SYS_lwp_create);

  gdb_praddsysset (traced_syscall_exits, SYS_lwp_exit);

#endif



#ifdef DYNAMIC_SYSCALLS

  {

    int callnum = find_syscall (pi, "execve");



    if (callnum >= 0)

      gdb_praddsysset (traced_syscall_exits, callnum);

    callnum = find_syscall (pi, "ra_execve");

    if (callnum >= 0)

      gdb_praddsysset (traced_syscall_exits, callnum);

  }

#endif



  status = proc_set_traced_sysexit (pi, traced_syscall_exits);

  xfree (traced_syscall_exits);

  if (!status)

    return __LINE__;



#endif /* PRFS_STOPEXEC */

  return 0;

}



static void

‌procfs_attach (struct target_ops *ops, const char *args, int from_tty)

{

  char *exec_file;

  int   pid;



  pid = parse_pid_to_attach (args);



  if (pid == getpid ())

    error (_("Attaching GDB to itself is not a good idea..."));



  if (from_tty)

    {

      exec_file = get_exec_file (0);



      if (exec_file)

        printf_filtered (_("Attaching to program `%s', %s\n"),

                         exec_file, target_pid_to_str (pid_to_ptid (pid)));

      else

        printf_filtered (_("Attaching to %s\n"),

                         target_pid_to_str (pid_to_ptid (pid)));



      fflush (stdout);

    }

  inferior_ptid = do_attach (pid_to_ptid (pid));

  if (!target_is_pushed (ops))

    push_target (ops);

}



static void

‌procfs_detach (struct target_ops *ops, const char *args, int from_tty)

{

  int sig = 0;

  int pid = ptid_get_pid (inferior_ptid);



  if (args)

    sig = atoi (args);



  if (from_tty)

    {

      char *exec_file;



      exec_file = get_exec_file (0);

      if (exec_file == NULL)

        exec_file = "";



      printf_filtered (_("Detaching from program: %s, %s\n"), exec_file,

                       target_pid_to_str (pid_to_ptid (pid)));

      gdb_flush (gdb_stdout);

    }



  do_detach (sig);



  inferior_ptid = null_ptid;

  detach_inferior (pid);

  inf_child_maybe_unpush_target (ops);

}



static ptid_t

‌do_attach (ptid_t ptid)

{

  procinfo *pi;

  struct inferior *inf;

  int fail;

  int lwpid;



  if ((pi = create_procinfo (ptid_get_pid (ptid), 0)) == NULL)

    perror (_("procfs: out of memory in 'attach'"));



  if (!open_procinfo_files (pi, FD_CTL))

    {

      fprintf_filtered (gdb_stderr, "procfs:%d -- ", __LINE__);

      sprintf (errmsg, "do_attach: couldn't open /proc file for process %d",

               ptid_get_pid (ptid));

      dead_procinfo (pi, errmsg, NOKILL);

    }



  /* Stop the process (if it isn't already stopped).  */

  if (proc_flags (pi) & (PR_STOPPED | PR_ISTOP))

    {

      pi->was_stopped = 1;

      proc_prettyprint_why (proc_why (pi), proc_what (pi), 1);

    }

  else

    {

      pi->was_stopped = 0;

      /* Set the process to run again when we close it.  */

      if (!proc_set_run_on_last_close (pi))

        dead_procinfo (pi, "do_attach: couldn't set RLC.", NOKILL);



      /* Now stop the process.  */

      if (!proc_stop_process (pi))

        dead_procinfo (pi, "do_attach: couldn't stop the process.", NOKILL);

      pi->ignore_next_sigstop = 1;

    }

  /* Save some of the /proc state to be restored if we detach.  */

  if (!proc_get_traced_faults   (pi, &pi->saved_fltset))

    dead_procinfo (pi, "do_attach: couldn't save traced faults.", NOKILL);

  if (!proc_get_traced_signals  (pi, &pi->saved_sigset))

    dead_procinfo (pi, "do_attach: couldn't save traced signals.", NOKILL);

  if (!proc_get_traced_sysentry (pi, pi->saved_entryset))

    dead_procinfo (pi, "do_attach: couldn't save traced syscall entries.",

                   NOKILL);

  if (!proc_get_traced_sysexit  (pi, pi->saved_exitset))

    dead_procinfo (pi, "do_attach: couldn't save traced syscall exits.",

                   NOKILL);

  if (!proc_get_held_signals    (pi, &pi->saved_sighold))

    dead_procinfo (pi, "do_attach: couldn't save held signals.", NOKILL);



  if ((fail = procfs_debug_inferior (pi)) != 0)

    dead_procinfo (pi, "do_attach: failed in procfs_debug_inferior", NOKILL);



  inf = current_inferior ();

  inferior_appeared (inf, pi->pid);

  /* Let GDB know that the inferior was attached.  */

  inf->attach_flag = 1;



  /* Create a procinfo for the current lwp.  */

  lwpid = proc_get_current_thread (pi);

  create_procinfo (pi->pid, lwpid);



  /* Add it to gdb's thread list.  */

  ptid = ptid_build (pi->pid, lwpid, 0);

  add_thread (ptid);



  return ptid;

}



static void

‌do_detach (int signo)

{

  procinfo *pi;



  /* Find procinfo for the main process.  */

  pi = find_procinfo_or_die (ptid_get_pid (inferior_ptid),

                             0); /* FIXME: threads */

  if (signo)

    if (!proc_set_current_signal (pi, signo))

      proc_warn (pi, "do_detach, set_current_signal", __LINE__);



  if (!proc_set_traced_signals (pi, &pi->saved_sigset))

    proc_warn (pi, "do_detach, set_traced_signal", __LINE__);



  if (!proc_set_traced_faults (pi, &pi->saved_fltset))

    proc_warn (pi, "do_detach, set_traced_faults", __LINE__);



  if (!proc_set_traced_sysentry (pi, pi->saved_entryset))

    proc_warn (pi, "do_detach, set_traced_sysentry", __LINE__);



  if (!proc_set_traced_sysexit (pi, pi->saved_exitset))

    proc_warn (pi, "do_detach, set_traced_sysexit", __LINE__);



  if (!proc_set_held_signals (pi, &pi->saved_sighold))

    proc_warn (pi, "do_detach, set_held_signals", __LINE__);



  if (signo || (proc_flags (pi) & (PR_STOPPED | PR_ISTOP)))

    if (signo || !(pi->was_stopped) ||

        query (_("Was stopped when attached, make it runnable again? ")))

      {

        /* Clear any pending signal.  */

        if (!proc_clear_current_fault (pi))

          proc_warn (pi, "do_detach, clear_current_fault", __LINE__);



        if (signo == 0 && !proc_clear_current_signal (pi))

          proc_warn (pi, "do_detach, clear_current_signal", __LINE__);



        if (!proc_set_run_on_last_close (pi))

          proc_warn (pi, "do_detach, set_rlc", __LINE__);

      }



  destroy_procinfo (pi);

}



/* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this

   for all registers.



   ??? Is the following note still relevant?  We can't get individual

   registers with the PT_GETREGS ptrace(2) request either, yet we

   don't bother with caching at all in that case.



   NOTE: Since the /proc interface cannot give us individual

   registers, we pay no attention to REGNUM, and just fetch them all.

   This results in the possibility that we will do unnecessarily many

   fetches, since we may be called repeatedly for individual

   registers.  So we cache the results, and mark the cache invalid

   when the process is resumed.  */



static void

‌procfs_fetch_registers (struct target_ops *ops,

                        struct regcache *regcache, int regnum)

{

  gdb_gregset_t *gregs;

  procinfo *pi;

  int pid = ptid_get_pid (inferior_ptid);

  int tid = ptid_get_lwp (inferior_ptid);

  struct gdbarch *gdbarch = get_regcache_arch (regcache);



  pi = find_procinfo_or_die (pid, tid);



  if (pi == NULL)

    error (_("procfs: fetch_registers failed to find procinfo for %s"),

           target_pid_to_str (inferior_ptid));



  gregs = proc_get_gregs (pi);

  if (gregs == NULL)

    proc_error (pi, "fetch_registers, get_gregs", __LINE__);



  supply_gregset (regcache, (const gdb_gregset_t *) gregs);



  if (gdbarch_fp0_regnum (gdbarch) >= 0) /* Do we have an FPU?  */

    {

      gdb_fpregset_t *fpregs;



      if ((regnum >= 0 && regnum < gdbarch_fp0_regnum (gdbarch))

          || regnum == gdbarch_pc_regnum (gdbarch)

          || regnum == gdbarch_sp_regnum (gdbarch))

        return;                        /* Not a floating point register.  */



      fpregs = proc_get_fpregs (pi);

      if (fpregs == NULL)

        proc_error (pi, "fetch_registers, get_fpregs", __LINE__);



      supply_fpregset (regcache, (const gdb_fpregset_t *) fpregs);

    }

}



/* Store register REGNUM back into the inferior.  If REGNUM is -1, do

   this for all registers.



   NOTE: Since the /proc interface will not read individual registers,

   we will cache these requests until the process is resumed, and only

   then write them back to the inferior process.



   FIXME: is that a really bad idea?  Have to think about cases where

   writing one register might affect the value of others, etc.  */



static void

‌procfs_store_registers (struct target_ops *ops,

                        struct regcache *regcache, int regnum)

{

  gdb_gregset_t *gregs;

  procinfo *pi;

  int pid = ptid_get_pid (inferior_ptid);

  int tid = ptid_get_lwp (inferior_ptid);

  struct gdbarch *gdbarch = get_regcache_arch (regcache);



  pi = find_procinfo_or_die (pid, tid);



  if (pi == NULL)

    error (_("procfs: store_registers: failed to find procinfo for %s"),

           target_pid_to_str (inferior_ptid));



  gregs = proc_get_gregs (pi);

  if (gregs == NULL)

    proc_error (pi, "store_registers, get_gregs", __LINE__);



  fill_gregset (regcache, gregs, regnum);

  if (!proc_set_gregs (pi))

    proc_error (pi, "store_registers, set_gregs", __LINE__);



  if (gdbarch_fp0_regnum (gdbarch) >= 0) /* Do we have an FPU?  */

    {

      gdb_fpregset_t *fpregs;



      if ((regnum >= 0 && regnum < gdbarch_fp0_regnum (gdbarch))

          || regnum == gdbarch_pc_regnum (gdbarch)

          || regnum == gdbarch_sp_regnum (gdbarch))

        return;                        /* Not a floating point register.  */



      fpregs = proc_get_fpregs (pi);

      if (fpregs == NULL)

        proc_error (pi, "store_registers, get_fpregs", __LINE__);



      fill_fpregset (regcache, fpregs, regnum);

      if (!proc_set_fpregs (pi))

        proc_error (pi, "store_registers, set_fpregs", __LINE__);

    }

}



static int

‌syscall_is_lwp_exit (procinfo *pi, int scall)

{

#ifdef SYS_lwp_exit

  if (scall == SYS_lwp_exit)

    return 1;

#endif

#ifdef SYS_lwpexit

  if (scall == SYS_lwpexit)

    return 1;

#endif

  return 0;

}



static int

‌syscall_is_exit (procinfo *pi, int scall)

{

#ifdef SYS_exit

  if (scall == SYS_exit)

    return 1;

#endif

#ifdef DYNAMIC_SYSCALLS

  if (find_syscall (pi, "_exit") == scall)

    return 1;

#endif

  return 0;

}



static int

‌syscall_is_exec (procinfo *pi, int scall)

{

#ifdef SYS_exec

  if (scall == SYS_exec)

    return 1;

#endif

#ifdef SYS_execv

  if (scall == SYS_execv)

    return 1;

#endif

#ifdef SYS_execve

  if (scall == SYS_execve)

    return 1;

#endif

#ifdef DYNAMIC_SYSCALLS

  if (find_syscall (pi, "_execve"))

    return 1;

  if (find_syscall (pi, "ra_execve"))

    return 1;

#endif

  return 0;

}



static int

‌syscall_is_lwp_create (procinfo *pi, int scall)

{

#ifdef SYS_lwp_create

  if (scall == SYS_lwp_create)

    return 1;

#endif

#ifdef SYS_lwpcreate

  if (scall == SYS_lwpcreate)

    return 1;

#endif

  return 0;

}



#ifdef SYS_syssgi

/* Return the address of the __dbx_link() function in the file

   refernced by ABFD by scanning its symbol table.  Return 0 if

   the symbol was not found.  */



static CORE_ADDR

‌dbx_link_addr (bfd *abfd)

{

  long storage_needed;

  asymbol **symbol_table;

  long number_of_symbols;

  long i;



  storage_needed = bfd_get_symtab_upper_bound (abfd);

  if (storage_needed <= 0)

    return 0;



  symbol_table = (asymbol **) xmalloc (storage_needed);

  make_cleanup (xfree, symbol_table);



  number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);



  for (i = 0; i < number_of_symbols; i++)

    {

      asymbol *sym = symbol_table[i];



      if ((sym->flags & BSF_GLOBAL)

          && sym->name != NULL && strcmp (sym->name, "__dbx_link") == 0)

        return (sym->value + sym->section->vma);

    }



  /* Symbol not found, return NULL.  */

  return 0;

}



/* Search the symbol table of the file referenced by FD for a symbol

   named __dbx_link().  If found, then insert a breakpoint at this location,

   and return nonzero.  Return zero otherwise.  */



static int

‌insert_dbx_link_bpt_in_file (int fd, CORE_ADDR ignored)

{

  bfd *abfd;

  long storage_needed;

  CORE_ADDR sym_addr;



  abfd = gdb_bfd_fdopenr ("unamed", 0, fd);

  if (abfd == NULL)

    {

      warning (_("Failed to create a bfd: %s."), bfd_errmsg (bfd_get_error ()));

      return 0;

    }



  if (!bfd_check_format (abfd, bfd_object))

    {

      /* Not the correct format, so we can not possibly find the dbx_link

         symbol in it.        */

      gdb_bfd_unref (abfd);

      return 0;

    }



  sym_addr = dbx_link_addr (abfd);

  if (sym_addr != 0)

    {

      struct breakpoint *dbx_link_bpt;



      /* Insert the breakpoint.  */

      dbx_link_bpt

        = create_and_insert_solib_event_breakpoint (target_gdbarch (),

                                                    sym_addr);

      if (dbx_link_bpt == NULL)

        {

          warning (_("Failed to insert dbx_link breakpoint."));

          gdb_bfd_unref (abfd);

          return 0;

        }

      gdb_bfd_unref (abfd);

      return 1;

    }



  gdb_bfd_unref (abfd);

  return 0;

}



/* Calls the supplied callback function once for each mapped address

   space in the process.  The callback function receives an open file

   descriptor for the file corresponding to that mapped address space

   (if there is one), and the base address of the mapped space.  Quit

   when the callback function returns a nonzero value, or at teh end

   of the mappings.  Returns the first non-zero return value of the

   callback function, or zero.  */



static int

‌solib_mappings_callback (struct prmap *map, int (*func) (int, CORE_ADDR),

                         void *data)

{

  procinfo *pi = data;

  int fd;



#ifdef NEW_PROC_API

  char name[MAX_PROC_NAME_SIZE + sizeof (map->pr_mapname)];



  if (map->pr_vaddr == 0 && map->pr_size == 0)

    return -1;                /* sanity */



  if (map->pr_mapname[0] == 0)

    {

      fd = -1;        /* no map file */

    }

  else

    {

      sprintf (name, "/proc/%d/object/%s", pi->pid, map->pr_mapname);

      /* Note: caller's responsibility to close this fd!  */

      fd = open_with_retry (name, O_RDONLY);

      /* Note: we don't test the above call for failure;

         we just pass the FD on as given.  Sometimes there is

         no file, so the open may return failure, but that's

         not a problem.  */

    }

#else

  fd = ioctl (pi->ctl_fd, PIOCOPENM, &map->pr_vaddr);

  /* Note: we don't test the above call for failure;

     we just pass the FD on as given.  Sometimes there is

     no file, so the ioctl may return failure, but that's

     not a problem.  */

#endif

  return (*func) (fd, (CORE_ADDR) map->pr_vaddr);

}



/* If the given memory region MAP contains a symbol named __dbx_link,

   insert a breakpoint at this location and return nonzero.  Return

   zero otherwise.  */



static int

‌insert_dbx_link_bpt_in_region (struct prmap *map,

                               find_memory_region_ftype child_func,

                               void *data)

{

  procinfo *pi = (procinfo *) data;



  /* We know the symbol we're looking for is in a text region, so

     only look for it if the region is a text one.  */

  if (map->pr_mflags & MA_EXEC)

    return solib_mappings_callback (map, insert_dbx_link_bpt_in_file, pi);



  return 0;

}



/* Search all memory regions for a symbol named __dbx_link.  If found,

   insert a breakpoint at its location, and return nonzero.  Return zero

   otherwise.  */



static int

‌insert_dbx_link_breakpoint (procinfo *pi)

{

  return iterate_over_mappings (pi, NULL, pi, insert_dbx_link_bpt_in_region);

}

#endif



/* Retrieve the next stop event from the child process.  If child has

   not stopped yet, wait for it to stop.  Translate /proc eventcodes

   (or possibly wait eventcodes) into gdb internal event codes.

   Returns the id of process (and possibly thread) that incurred the

   event.  Event codes are returned through a pointer parameter.  */



static ptid_t

‌procfs_wait (struct target_ops *ops,

             ptid_t ptid, struct target_waitstatus *status, int options)

{

  /* First cut: loosely based on original version 2.1.  */

  procinfo *pi;

  int       wstat;

  int       temp_tid;

  ptid_t    retval, temp_ptid;

  int       why, what, flags;

  int       retry = 0;



wait_again:



  retry++;

  wstat    = 0;

  retval   = pid_to_ptid (-1);



  /* Find procinfo for main process.  */

  pi = find_procinfo_or_die (ptid_get_pid (inferior_ptid), 0);

  if (pi)

    {

      /* We must assume that the status is stale now...  */

      pi->status_valid = 0;

      pi->gregs_valid  = 0;

      pi->fpregs_valid = 0;



#if 0        /* just try this out...  */

      flags = proc_flags (pi);

      why   = proc_why (pi);

      if ((flags & PR_STOPPED) && (why == PR_REQUESTED))

        pi->status_valid = 0;        /* re-read again, IMMEDIATELY...  */

#endif

      /* If child is not stopped, wait for it to stop.  */

      if (!(proc_flags (pi) & (PR_STOPPED | PR_ISTOP)) &&

          !proc_wait_for_stop (pi))

        {

          /* wait_for_stop failed: has the child terminated?  */

          if (errno == ENOENT)

            {

              int wait_retval;



              /* /proc file not found; presumably child has terminated.  */

              wait_retval = wait (&wstat); /* "wait" for the child's exit.  */



              /* Wrong child?  */

              if (wait_retval != ptid_get_pid (inferior_ptid))

                error (_("procfs: couldn't stop "

                         "process %d: wait returned %d."),

                       ptid_get_pid (inferior_ptid), wait_retval);

              /* FIXME: might I not just use waitpid?

                 Or try find_procinfo to see if I know about this child?  */

              retval = pid_to_ptid (wait_retval);

            }

          else if (errno == EINTR)

            goto wait_again;

          else

            {

              /* Unknown error from wait_for_stop.  */

              proc_error (pi, "target_wait (wait_for_stop)", __LINE__);

            }

        }

      else

        {

          /* This long block is reached if either:

             a) the child was already stopped, or

             b) we successfully waited for the child with wait_for_stop.

             This block will analyze the /proc status, and translate it

             into a waitstatus for GDB.



             If we actually had to call wait because the /proc file

             is gone (child terminated), then we skip this block,

             because we already have a waitstatus.  */



          flags = proc_flags (pi);

          why   = proc_why (pi);

          what  = proc_what (pi);



          if (flags & (PR_STOPPED | PR_ISTOP))

            {

#ifdef PR_ASYNC

              /* If it's running async (for single_thread control),

                 set it back to normal again.  */

              if (flags & PR_ASYNC)

                if (!proc_unset_async (pi))

                  proc_error (pi, "target_wait, unset_async", __LINE__);

#endif



              if (info_verbose)

                proc_prettyprint_why (why, what, 1);



              /* The 'pid' we will return to GDB is composed of

                 the process ID plus the lwp ID.  */

              retval = ptid_build (pi->pid, proc_get_current_thread (pi), 0);



              switch (why) {

              case PR_SIGNALLED:

                wstat = (what << 8) | 0177;

                break;

              case PR_SYSENTRY:

                if (syscall_is_lwp_exit (pi, what))

                  {

                    if (print_thread_events)

                      printf_unfiltered (_("[%s exited]\n"),

                                         target_pid_to_str (retval));

                    delete_thread (retval);

                    status->kind = TARGET_WAITKIND_SPURIOUS;

                    return retval;

                  }

                else if (syscall_is_exit (pi, what))

                  {

                    struct inferior *inf;



                    /* Handle SYS_exit call only.  */

                    /* Stopped at entry to SYS_exit.

                       Make it runnable, resume it, then use

                       the wait system call to get its exit code.

                       Proc_run_process always clears the current

                       fault and signal.

                       Then return its exit status.  */

                    pi->status_valid = 0;

                    wstat = 0;

                    /* FIXME: what we should do is return

                       TARGET_WAITKIND_SPURIOUS.  */

                    if (!proc_run_process (pi, 0, 0))

                      proc_error (pi, "target_wait, run_process", __LINE__);



                    inf = find_inferior_pid (pi->pid);

                    if (inf->attach_flag)

                      {

                        /* Don't call wait: simulate waiting for exit,

                           return a "success" exit code.  Bogus: what if

                           it returns something else?  */

                        wstat = 0;

                        retval = inferior_ptid;  /* ? ? ? */

                      }

                    else

                      {

                        int temp = wait (&wstat);



                        /* FIXME: shouldn't I make sure I get the right

                           event from the right process?  If (for

                           instance) I have killed an earlier inferior

                           process but failed to clean up after it

                           somehow, I could get its termination event

                           here.  */



                        /* If wait returns -1, that's what we return

                           to GDB.  */

                        if (temp < 0)

                          retval = pid_to_ptid (temp);

                      }

                  }

                else

                  {

                    printf_filtered (_("procfs: trapped on entry to "));

                    proc_prettyprint_syscall (proc_what (pi), 0);

                    printf_filtered ("\n");

#ifndef PIOCSSPCACT

                    {

                      long i, nsysargs, *sysargs;



                      if ((nsysargs = proc_nsysarg (pi)) > 0 &&

                          (sysargs  = proc_sysargs (pi)) != NULL)

                        {

                          printf_filtered (_("%ld syscall arguments:\n"),

                                           nsysargs);

                          for (i = 0; i < nsysargs; i++)

                            printf_filtered ("#%ld: 0x%08lx\n",

                                             i, sysargs[i]);

                        }



                    }

#endif

                    if (status)

                      {

                        /* How to exit gracefully, returning "unknown

                           event".  */

                        status->kind = TARGET_WAITKIND_SPURIOUS;

                        return inferior_ptid;

                      }

                    else

                      {

                        /* How to keep going without returning to wfi: */

                        target_resume (ptid, 0, GDB_SIGNAL_0);

                        goto wait_again;

                      }

                  }

                break;

              case PR_SYSEXIT:

                if (syscall_is_exec (pi, what))

                  {

                    /* Hopefully this is our own "fork-child" execing

                       the real child.  Hoax this event into a trap, and

                       GDB will see the child about to execute its start

                       address.  */

                    wstat = (SIGTRAP << 8) | 0177;

                  }

#ifdef SYS_syssgi

                else if (what == SYS_syssgi)

                  {

                    /* see if we can break on dbx_link().  If yes, then

                       we no longer need the SYS_syssgi notifications.        */

                    if (insert_dbx_link_breakpoint (pi))

                      proc_trace_syscalls_1 (pi, SYS_syssgi, PR_SYSEXIT,

                                             FLAG_RESET, 0);



                    /* This is an internal event and should be transparent

                       to wfi, so resume the execution and wait again.        See

                       comment in procfs_init_inferior() for more details.  */

                    target_resume (ptid, 0, GDB_SIGNAL_0);

                    goto wait_again;

                  }

#endif

                else if (syscall_is_lwp_create (pi, what))

                  {

                    /* This syscall is somewhat like fork/exec.  We

                       will get the event twice: once for the parent

                       LWP, and once for the child.  We should already

                       know about the parent LWP, but the child will

                       be new to us.  So, whenever we get this event,

                       if it represents a new thread, simply add the

                       thread to the list.  */



                    /* If not in procinfo list, add it.  */

                    temp_tid = proc_get_current_thread (pi);

                    if (!find_procinfo (pi->pid, temp_tid))

                      create_procinfo  (pi->pid, temp_tid);



                    temp_ptid = ptid_build (pi->pid, temp_tid, 0);

                    /* If not in GDB's thread list, add it.  */

                    if (!in_thread_list (temp_ptid))

                      add_thread (temp_ptid);



                    /* Return to WFI, but tell it to immediately resume.  */

                    status->kind = TARGET_WAITKIND_SPURIOUS;

                    return inferior_ptid;

                  }

                else if (syscall_is_lwp_exit (pi, what))

                  {

                    if (print_thread_events)

                      printf_unfiltered (_("[%s exited]\n"),

                                         target_pid_to_str (retval));

                    delete_thread (retval);

                    status->kind = TARGET_WAITKIND_SPURIOUS;

                    return retval;

                  }

                else if (0)

                  {

                    /* FIXME:  Do we need to handle SYS_sproc,

                       SYS_fork, or SYS_vfork here?  The old procfs

                       seemed to use this event to handle threads on

                       older (non-LWP) systems, where I'm assuming

                       that threads were actually separate processes.

                       Irix, maybe?  Anyway, low priority for now.  */

                  }

                else

                  {

                    printf_filtered (_("procfs: trapped on exit from "));

                    proc_prettyprint_syscall (proc_what (pi), 0);

                    printf_filtered ("\n");

#ifndef PIOCSSPCACT

                    {

                      long i, nsysargs, *sysargs;



                      if ((nsysargs = proc_nsysarg (pi)) > 0 &&

                          (sysargs  = proc_sysargs (pi)) != NULL)

                        {

                          printf_filtered (_("%ld syscall arguments:\n"),

                                           nsysargs);

                          for (i = 0; i < nsysargs; i++)

                            printf_filtered ("#%ld: 0x%08lx\n",

                                             i, sysargs[i]);

                        }

                    }

#endif

                    status->kind = TARGET_WAITKIND_SPURIOUS;

                    return inferior_ptid;

                  }

                break;

              case PR_REQUESTED:

#if 0        /* FIXME */

                wstat = (SIGSTOP << 8) | 0177;

                break;

#else

                if (retry < 5)

                  {

                    printf_filtered (_("Retry #%d:\n"), retry);

                    pi->status_valid = 0;

                    goto wait_again;

                  }

                else

                  {

                    /* If not in procinfo list, add it.  */

                    temp_tid = proc_get_current_thread (pi);

                    if (!find_procinfo (pi->pid, temp_tid))

                      create_procinfo  (pi->pid, temp_tid);



                    /* If not in GDB's thread list, add it.  */

                    temp_ptid = ptid_build (pi->pid, temp_tid, 0);

                    if (!in_thread_list (temp_ptid))

                      add_thread (temp_ptid);



                    status->kind = TARGET_WAITKIND_STOPPED;

                    status->value.sig = 0;

                    return retval;

                  }

#endif

              case PR_JOBCONTROL:

                wstat = (what << 8) | 0177;

                break;

              case PR_FAULTED:

                switch (what) {

#ifdef FLTWATCH

                case FLTWATCH:

                  wstat = (SIGTRAP << 8) | 0177;

                  break;

#endif

#ifdef FLTKWATCH

                case FLTKWATCH:

                  wstat = (SIGTRAP << 8) | 0177;

                  break;

#endif

                  /* FIXME: use si_signo where possible.  */

                case FLTPRIV:

#if (FLTILL != FLTPRIV)                /* Avoid "duplicate case" error.  */

                case FLTILL:

#endif

                  wstat = (SIGILL << 8) | 0177;

                  break;

                case FLTBPT:

#if (FLTTRACE != FLTBPT)        /* Avoid "duplicate case" error.  */

                case FLTTRACE:

#endif

                  wstat = (SIGTRAP << 8) | 0177;

                  break;

                case FLTSTACK:

                case FLTACCESS:

#if (FLTBOUNDS != FLTSTACK)        /* Avoid "duplicate case" error.  */

                case FLTBOUNDS:

#endif

                  wstat = (SIGSEGV << 8) | 0177;

                  break;

                case FLTIOVF:

                case FLTIZDIV:

#if (FLTFPE != FLTIOVF)                /* Avoid "duplicate case" error.  */

                case FLTFPE:

#endif

                  wstat = (SIGFPE << 8) | 0177;

                  break;

                case FLTPAGE:        /* Recoverable page fault */

                default:        /* FIXME: use si_signo if possible for

                                   fault.  */

                  retval = pid_to_ptid (-1);

                  printf_filtered ("procfs:%d -- ", __LINE__);

                  printf_filtered (_("child stopped for unknown reason:\n"));

                  proc_prettyprint_why (why, what, 1);

                  error (_("... giving up..."));

                  break;

                }

                break;        /* case PR_FAULTED: */

              default:        /* switch (why) unmatched */

                printf_filtered ("procfs:%d -- ", __LINE__);

                printf_filtered (_("child stopped for unknown reason:\n"));

                proc_prettyprint_why (why, what, 1);

                error (_("... giving up..."));

                break;

              }

              /* Got this far without error: If retval isn't in the

                 threads database, add it.  */

              if (ptid_get_pid (retval) > 0 &&

                  !ptid_equal (retval, inferior_ptid) &&

                  !in_thread_list (retval))

                {

                  /* We have a new thread.  We need to add it both to

                     GDB's list and to our own.  If we don't create a

                     procinfo, resume may be unhappy later.  */

                  add_thread (retval);

                  if (find_procinfo (ptid_get_pid (retval),

                                     ptid_get_lwp (retval)) == NULL)

                    create_procinfo (ptid_get_pid (retval),

                                     ptid_get_lwp (retval));

                }

            }

          else        /* Flags do not indicate STOPPED.  */

            {

              /* surely this can't happen...  */

              printf_filtered ("procfs:%d -- process not stopped.\n",

                               __LINE__);

              proc_prettyprint_flags (flags, 1);

              error (_("procfs: ...giving up..."));

            }

        }



      if (status)

        store_waitstatus (status, wstat);

    }



  return retval;

}



/* Perform a partial transfer to/from the specified object.  For

   memory transfers, fall back to the old memory xfer functions.  */



static enum target_xfer_status

‌procfs_xfer_partial (struct target_ops *ops, enum target_object object,

                     const char *annex, gdb_byte *readbuf,

                     const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,

                     ULONGEST *xfered_len)

{

  switch (object)

    {

    case TARGET_OBJECT_MEMORY:

      return procfs_xfer_memory (readbuf, writebuf, offset, len, xfered_len);



#ifdef NEW_PROC_API

    case TARGET_OBJECT_AUXV:

      return memory_xfer_auxv (ops, object, annex, readbuf, writebuf,

                               offset, len, xfered_len);

#endif



    default:

      return ops->beneath->to_xfer_partial (ops->beneath, object, annex,

                                            readbuf, writebuf, offset, len,

                                            xfered_len);

    }

}



/* Helper for procfs_xfer_partial that handles memory transfers.

   Arguments are like target_xfer_partial.  */



static enum target_xfer_status

‌procfs_xfer_memory (gdb_byte *readbuf, const gdb_byte *writebuf,

                    ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len)

{

  procinfo *pi;

  int nbytes;



  /* Find procinfo for main process.  */

  pi = find_procinfo_or_die (ptid_get_pid (inferior_ptid), 0);

  if (pi->as_fd == 0 &&

      open_procinfo_files (pi, FD_AS) == 0)

    {

      proc_warn (pi, "xfer_memory, open_proc_files", __LINE__);

      return TARGET_XFER_E_IO;

    }



  if (lseek (pi->as_fd, (off_t) memaddr, SEEK_SET) != (off_t) memaddr)

    return TARGET_XFER_E_IO;



  if (writebuf != NULL)

    {

      PROCFS_NOTE ("write memory:\n");

      nbytes = write (pi->as_fd, writebuf, len);

    }

  else

    {

      PROCFS_NOTE ("read  memory:\n");

      nbytes = read (pi->as_fd, readbuf, len);

    }

  if (nbytes <= 0)

    return TARGET_XFER_E_IO;

  *xfered_len = nbytes;

  return TARGET_XFER_OK;

}



/* Called by target_resume before making child runnable.  Mark cached

   registers and status's invalid.  If there are "dirty" caches that

   need to be written back to the child process, do that.



   File descriptors are also cached.  As they are a limited resource,

   we cannot hold onto them indefinitely.  However, as they are

   expensive to open, we don't want to throw them away

   indescriminately either.  As a compromise, we will keep the file

   descriptors for the parent process, but discard any file

   descriptors we may have accumulated for the threads.



   As this function is called by iterate_over_threads, it always

   returns zero (so that iterate_over_threads will keep

   iterating).  */



static int

‌invalidate_cache (procinfo *parent, procinfo *pi, void *ptr)

{

  /* About to run the child; invalidate caches and do any other

     cleanup.  */



#if 0

  if (pi->gregs_dirty)

    if (parent == NULL ||

        proc_get_current_thread (parent) != pi->tid)

      if (!proc_set_gregs (pi))        /* flush gregs cache */

        proc_warn (pi, "target_resume, set_gregs",

                   __LINE__);

  if (gdbarch_fp0_regnum (target_gdbarch ()) >= 0)

    if (pi->fpregs_dirty)

      if (parent == NULL ||

          proc_get_current_thread (parent) != pi->tid)

        if (!proc_set_fpregs (pi))        /* flush fpregs cache */

          proc_warn (pi, "target_resume, set_fpregs",

                     __LINE__);

#endif



  if (parent != NULL)

    {

      /* The presence of a parent indicates that this is an LWP.

         Close any file descriptors that it might have open.

         We don't do this to the master (parent) procinfo.  */



      close_procinfo_files (pi);

    }

  pi->gregs_valid   = 0;

  pi->fpregs_valid  = 0;

#if 0

  pi->gregs_dirty   = 0;

  pi->fpregs_dirty  = 0;

#endif

  pi->status_valid  = 0;

  pi->threads_valid = 0;



  return 0;

}



#if 0

/* A callback function for iterate_over_threads.  Find the

   asynchronous signal thread, and make it runnable.  See if that

   helps matters any.  */



static int

make_signal_thread_runnable (procinfo *process, procinfo *pi, void *ptr)

{

#ifdef PR_ASLWP

  if (proc_flags (pi) & PR_ASLWP)

    {

      if (!proc_run_process (pi, 0, -1))

        proc_error (pi, "make_signal_thread_runnable", __LINE__);

      return 1;

    }

#endif

  return 0;

}

#endif



/* Make the child process runnable.  Normally we will then call

   procfs_wait and wait for it to stop again (unless gdb is async).



   If STEP is true, then arrange for the child to stop again after

   executing a single instruction.  If SIGNO is zero, then cancel any

   pending signal; if non-zero, then arrange for the indicated signal

   to be delivered to the child when it runs.  If PID is -1, then

   allow any child thread to run; if non-zero, then allow only the

   indicated thread to run.  (not implemented yet).  */



static void

‌procfs_resume (struct target_ops *ops,

               ptid_t ptid, int step, enum gdb_signal signo)

{

  procinfo *pi, *thread;

  int native_signo;



  /* 2.1:

     prrun.prflags |= PRSVADDR;

     prrun.pr_vaddr = $PC;           set resume address

     prrun.prflags |= PRSTRACE;    trace signals in pr_trace (all)

     prrun.prflags |= PRSFAULT;    trace faults in pr_fault (all but PAGE)

     prrun.prflags |= PRCFAULT;    clear current fault.



     PRSTRACE and PRSFAULT can be done by other means

        (proc_trace_signals, proc_trace_faults)

     PRSVADDR is unnecessary.

     PRCFAULT may be replaced by a PIOCCFAULT call (proc_clear_current_fault)

     This basically leaves PRSTEP and PRCSIG.

     PRCSIG is like PIOCSSIG (proc_clear_current_signal).

     So basically PR_STEP is the sole argument that must be passed

     to proc_run_process (for use in the prrun struct by ioctl).  */



  /* Find procinfo for main process.  */

  pi = find_procinfo_or_die (ptid_get_pid (inferior_ptid), 0);



  /* First cut: ignore pid argument.  */

  errno = 0;



  /* Convert signal to host numbering.  */

  if (signo == 0 ||

      (signo == GDB_SIGNAL_STOP && pi->ignore_next_sigstop))

    native_signo = 0;

  else

    native_signo = gdb_signal_to_host (signo);



  pi->ignore_next_sigstop = 0;



  /* Running the process voids all cached registers and status.  */

  /* Void the threads' caches first.  */

  proc_iterate_over_threads (pi, invalidate_cache, NULL);

  /* Void the process procinfo's caches.  */

  invalidate_cache (NULL, pi, NULL);



  if (ptid_get_pid (ptid) != -1)

    {

      /* Resume a specific thread, presumably suppressing the

         others.  */

      thread = find_procinfo (ptid_get_pid (ptid), ptid_get_lwp (ptid));

      if (thread != NULL)

        {

          if (thread->tid != 0)

            {

              /* We're to resume a specific thread, and not the

                 others.  Set the child process's PR_ASYNC flag.  */

#ifdef PR_ASYNC

              if (!proc_set_async (pi))

                proc_error (pi, "target_resume, set_async", __LINE__);

#endif

#if 0

              proc_iterate_over_threads (pi,

                                         make_signal_thread_runnable,

                                         NULL);

#endif

              pi = thread;        /* Substitute the thread's procinfo

                                   for run.  */

            }

        }

    }



  if (!proc_run_process (pi, step, native_signo))

    {

      if (errno == EBUSY)

        warning (_("resume: target already running.  "

                   "Pretend to resume, and hope for the best!"));

      else

        proc_error (pi, "target_resume", __LINE__);

    }

}



/* Set up to trace signals in the child process.  */



static void

‌procfs_pass_signals (struct target_ops *self,

                     int numsigs, unsigned char *pass_signals)

{

  gdb_sigset_t signals;

  procinfo *pi = find_procinfo_or_die (ptid_get_pid (inferior_ptid), 0);

  int signo;



  prfillset (&signals);



  for (signo = 0; signo < NSIG; signo++)

    {

      int target_signo = gdb_signal_from_host (signo);

      if (target_signo < numsigs && pass_signals[target_signo])

        gdb_prdelset (&signals, signo);

    }



  if (!proc_set_traced_signals (pi, &signals))

    proc_error (pi, "pass_signals", __LINE__);

}



/* Print status information about the child process.  */



static void

‌procfs_files_info (struct target_ops *ignore)

{

  struct inferior *inf = current_inferior ();



  printf_filtered (_("\tUsing the running image of %s %s via /proc.\n"),

                   inf->attach_flag? "attached": "child",

                   target_pid_to_str (inferior_ptid));

}



/* Stop the child process asynchronously, as when the gdb user types

   control-c or presses a "stop" button.  Works by sending

   kill(SIGINT) to the child's process group.  */



static void

‌procfs_stop (struct target_ops *self, ptid_t ptid)

{

  kill (-inferior_process_group (), SIGINT);

}



/* Make it die.  Wait for it to die.  Clean up after it.  Note: this

   should only be applied to the real process, not to an LWP, because

   of the check for parent-process.  If we need this to work for an

   LWP, it needs some more logic.  */



static void

‌unconditionally_kill_inferior (procinfo *pi)

{

  int parent_pid;



  parent_pid = proc_parent_pid (pi);

#ifdef PROCFS_NEED_PIOCSSIG_FOR_KILL

  /* Alpha OSF/1-2.x procfs needs a PIOCSSIG call with a SIGKILL signal

     to kill the inferior, otherwise it might remain stopped with a

     pending SIGKILL.

     We do not check the result of the PIOCSSIG, the inferior might have

     died already.  */

  {

    gdb_siginfo_t newsiginfo;



    memset ((char *) &newsiginfo, 0, sizeof (newsiginfo));

    newsiginfo.si_signo = SIGKILL;

    newsiginfo.si_code = 0;

    newsiginfo.si_errno = 0;

    newsiginfo.si_pid = getpid ();

    newsiginfo.si_uid = getuid ();

    /* FIXME: use proc_set_current_signal.  */

    ioctl (pi->ctl_fd, PIOCSSIG, &newsiginfo);

  }

#else /* PROCFS_NEED_PIOCSSIG_FOR_KILL */

  if (!proc_kill (pi, SIGKILL))

    proc_error (pi, "unconditionally_kill, proc_kill", __LINE__);

#endif /* PROCFS_NEED_PIOCSSIG_FOR_KILL */

  destroy_procinfo (pi);



  /* If pi is GDB's child, wait for it to die.  */

  if (parent_pid == getpid ())

    /* FIXME: should we use waitpid to make sure we get the right event?

       Should we check the returned event?  */

    {

#if 0

      int status, ret;



      ret = waitpid (pi->pid, &status, 0);

#else

      wait (NULL);

#endif

    }

}



/* We're done debugging it, and we want it to go away.  Then we want

   GDB to forget all about it.  */



static void

‌procfs_kill_inferior (struct target_ops *ops)

{

  if (!ptid_equal (inferior_ptid, null_ptid)) /* ? */

    {

      /* Find procinfo for main process.  */

      procinfo *pi = find_procinfo (ptid_get_pid (inferior_ptid), 0);



      if (pi)

        unconditionally_kill_inferior (pi);

      target_mourn_inferior ();

    }

}



/* Forget we ever debugged this thing!  */



static void

‌procfs_mourn_inferior (struct target_ops *ops)

{

  procinfo *pi;



  if (!ptid_equal (inferior_ptid, null_ptid))

    {

      /* Find procinfo for main process.  */

      pi = find_procinfo (ptid_get_pid (inferior_ptid), 0);

      if (pi)

        destroy_procinfo (pi);

    }



  generic_mourn_inferior ();



  inf_child_maybe_unpush_target (ops);

}



/* When GDB forks to create a runnable inferior process, this function

   is called on the parent side of the fork.  It's job is to do

   whatever is necessary to make the child ready to be debugged, and

   then wait for the child to synchronize.  */



static void

‌procfs_init_inferior (struct target_ops *ops, int pid)

{

  procinfo *pi;

  gdb_sigset_t signals;

  int fail;

  int lwpid;



  /* This routine called on the parent side (GDB side)

     after GDB forks the inferior.  */

  if (!target_is_pushed (ops))

    push_target (ops);



  if ((pi = create_procinfo (pid, 0)) == NULL)

    perror (_("procfs: out of memory in 'init_inferior'"));



  if (!open_procinfo_files (pi, FD_CTL))

    proc_error (pi, "init_inferior, open_proc_files", __LINE__);



  /*

    xmalloc                        // done

    open_procinfo_files                // done

    link list                        // done

    prfillset (trace)

    procfs_notice_signals

    prfillset (fault)

    prdelset (FLTPAGE)

    PIOCWSTOP

    PIOCSFAULT

    */



  /* If not stopped yet, wait for it to stop.  */

  if (!(proc_flags (pi) & PR_STOPPED) &&

      !(proc_wait_for_stop (pi)))

    dead_procinfo (pi, "init_inferior: wait_for_stop failed", KILL);



  /* Save some of the /proc state to be restored if we detach.  */

  /* FIXME: Why?  In case another debugger was debugging it?

     We're it's parent, for Ghu's sake!  */

  if (!proc_get_traced_signals  (pi, &pi->saved_sigset))

    proc_error (pi, "init_inferior, get_traced_signals", __LINE__);

  if (!proc_get_held_signals    (pi, &pi->saved_sighold))

    proc_error (pi, "init_inferior, get_held_signals", __LINE__);

  if (!proc_get_traced_faults   (pi, &pi->saved_fltset))

    proc_error (pi, "init_inferior, get_traced_faults", __LINE__);

  if (!proc_get_traced_sysentry (pi, pi->saved_entryset))

    proc_error (pi, "init_inferior, get_traced_sysentry", __LINE__);

  if (!proc_get_traced_sysexit  (pi, pi->saved_exitset))

    proc_error (pi, "init_inferior, get_traced_sysexit", __LINE__);



  if ((fail = procfs_debug_inferior (pi)) != 0)

    proc_error (pi, "init_inferior (procfs_debug_inferior)", fail);



  /* FIXME: logically, we should really be turning OFF run-on-last-close,

     and possibly even turning ON kill-on-last-close at this point.  But

     I can't make that change without careful testing which I don't have

     time to do right now...  */

  /* Turn on run-on-last-close flag so that the child

     will die if GDB goes away for some reason.  */

  if (!proc_set_run_on_last_close (pi))

    proc_error (pi, "init_inferior, set_RLC", __LINE__);



  /* We now have have access to the lwpid of the main thread/lwp.  */

  lwpid = proc_get_current_thread (pi);



  /* Create a procinfo for the main lwp.  */

  create_procinfo (pid, lwpid);



  /* We already have a main thread registered in the thread table at

     this point, but it didn't have any lwp info yet.  Notify the core

     about it.  This changes inferior_ptid as well.  */

  thread_change_ptid (pid_to_ptid (pid),

                      ptid_build (pid, lwpid, 0));



  startup_inferior (START_INFERIOR_TRAPS_EXPECTED);



#ifdef SYS_syssgi

  /* On mips-irix, we need to stop the inferior early enough during

     the startup phase in order to be able to load the shared library

     symbols and insert the breakpoints that are located in these shared

     libraries.  Stopping at the program entry point is not good enough

     because the -init code is executed before the execution reaches

     that point.



     So what we need to do is to insert a breakpoint in the runtime

     loader (rld), more precisely in __dbx_link().  This procedure is

     called by rld once all shared libraries have been mapped, but before

     the -init code is executed.  Unfortuantely, this is not straightforward,

     as rld is not part of the executable we are running, and thus we need

     the inferior to run until rld itself has been mapped in memory.



     For this, we trace all syssgi() syscall exit events.  Each time

     we detect such an event, we iterate over each text memory maps,

     get its associated fd, and scan the symbol table for __dbx_link().

     When found, we know that rld has been mapped, and that we can insert

     the breakpoint at the symbol address.  Once the dbx_link() breakpoint

     has been inserted, the syssgi() notifications are no longer necessary,

     so they should be canceled.  */

  proc_trace_syscalls_1 (pi, SYS_syssgi, PR_SYSEXIT, FLAG_SET, 0);

#endif

}



/* When GDB forks to create a new process, this function is called on

   the child side of the fork before GDB exec's the user program.  Its

   job is to make the child minimally debuggable, so that the parent

   GDB process can connect to the child and take over.  This function

   should do only the minimum to make that possible, and to

   synchronize with the parent process.  The parent process should

   take care of the details.  */



static void

‌procfs_set_exec_trap (void)

{

  /* This routine called on the child side (inferior side)

     after GDB forks the inferior.  It must use only local variables,

     because it may be sharing data space with its parent.  */



  procinfo *pi;

  sysset_t *exitset;



  if ((pi = create_procinfo (getpid (), 0)) == NULL)

    perror_with_name (_("procfs: create_procinfo failed in child."));



  if (open_procinfo_files (pi, FD_CTL) == 0)

    {

      proc_warn (pi, "set_exec_trap, open_proc_files", __LINE__);

      gdb_flush (gdb_stderr);

      /* No need to call "dead_procinfo", because we're going to

         exit.  */

      _exit (127);

    }



#ifdef PRFS_STOPEXEC        /* defined on OSF */

  /* OSF method for tracing exec syscalls.  Quoting:

     Under Alpha OSF/1 we have to use a PIOCSSPCACT ioctl to trace

     exits from exec system calls because of the user level loader.  */

  /* FIXME: make nice and maybe move into an access function.  */

  {

    int prfs_flags;



    if (ioctl (pi->ctl_fd, PIOCGSPCACT, &prfs_flags) < 0)

      {

        proc_warn (pi, "set_exec_trap (PIOCGSPCACT)", __LINE__);

        gdb_flush (gdb_stderr);

        _exit (127);

      }

    prfs_flags |= PRFS_STOPEXEC;



    if (ioctl (pi->ctl_fd, PIOCSSPCACT, &prfs_flags) < 0)

      {

        proc_warn (pi, "set_exec_trap (PIOCSSPCACT)", __LINE__);

        gdb_flush (gdb_stderr);

        _exit (127);

      }

  }

#else /* not PRFS_STOPEXEC */

  /* Everyone else's (except OSF) method for tracing exec syscalls.  */

  /* GW: Rationale...

     Not all systems with /proc have all the exec* syscalls with the same

     names.  On the SGI, for example, there is no SYS_exec, but there

     *is* a SYS_execv.  So, we try to account for that.  */



  exitset = sysset_t_alloc (pi);

  gdb_premptysysset (exitset);

#ifdef SYS_exec

  gdb_praddsysset (exitset, SYS_exec);

#endif

#ifdef SYS_execve

  gdb_praddsysset (exitset, SYS_execve);

#endif

#ifdef SYS_execv

  gdb_praddsysset (exitset, SYS_execv);

#endif

#ifdef DYNAMIC_SYSCALLS

  {

    int callnum = find_syscall (pi, "execve");



    if (callnum >= 0)

      gdb_praddsysset (exitset, callnum);



    callnum = find_syscall (pi, "ra_execve");

    if (callnum >= 0)

      gdb_praddsysset (exitset, callnum);

  }

#endif /* DYNAMIC_SYSCALLS */



  if (!proc_set_traced_sysexit (pi, exitset))

    {

      proc_warn (pi, "set_exec_trap, set_traced_sysexit", __LINE__);

      gdb_flush (gdb_stderr);

      _exit (127);

    }

#endif /* PRFS_STOPEXEC */



  /* FIXME: should this be done in the parent instead?  */

  /* Turn off inherit on fork flag so that all grand-children

     of gdb start with tracing flags cleared.  */

  if (!proc_unset_inherit_on_fork (pi))

    proc_warn (pi, "set_exec_trap, unset_inherit", __LINE__);



  /* Turn off run on last close flag, so that the child process

     cannot run away just because we close our handle on it.

     We want it to wait for the parent to attach.  */

  if (!proc_unset_run_on_last_close (pi))

    proc_warn (pi, "set_exec_trap, unset_RLC", __LINE__);



  /* FIXME: No need to destroy the procinfo --

     we have our own address space, and we're about to do an exec!  */

  /*destroy_procinfo (pi);*/

}



/* This function is called BEFORE gdb forks the inferior process.  Its

   only real responsibility is to set things up for the fork, and tell

   GDB which two functions to call after the fork (one for the parent,

   and one for the child).



   This function does a complicated search for a unix shell program,

   which it then uses to parse arguments and environment variables to

   be sent to the child.  I wonder whether this code could not be

   abstracted out and shared with other unix targets such as

   inf-ptrace?  */



static void

‌procfs_create_inferior (struct target_ops *ops, char *exec_file,

                        char *allargs, char **env, int from_tty)

{

  char *shell_file = getenv ("SHELL");

  char *tryname;

  int pid;



  if (shell_file != NULL && strchr (shell_file, '/') == NULL)

    {



      /* We will be looking down the PATH to find shell_file.  If we

         just do this the normal way (via execlp, which operates by

         attempting an exec for each element of the PATH until it

         finds one which succeeds), then there will be an exec for

         each failed attempt, each of which will cause a PR_SYSEXIT

         stop, and we won't know how to distinguish the PR_SYSEXIT's

         for these failed execs with the ones for successful execs

         (whether the exec has succeeded is stored at that time in the

         carry bit or some such architecture-specific and

         non-ABI-specified place).



         So I can't think of anything better than to search the PATH

         now.  This has several disadvantages: (1) There is a race

         condition; if we find a file now and it is deleted before we

         exec it, we lose, even if the deletion leaves a valid file

         further down in the PATH, (2) there is no way to know exactly

         what an executable (in the sense of "capable of being

         exec'd") file is.  Using access() loses because it may lose

         if the caller is the superuser; failing to use it loses if

         there are ACLs or some such.  */



      char *p;

      char *p1;

      /* FIXME-maybe: might want "set path" command so user can change what

         path is used from within GDB.  */

      char *path = getenv ("PATH");

      int len;

      struct stat statbuf;



      if (path == NULL)

        path = "/bin:/usr/bin";



      tryname = alloca (strlen (path) + strlen (shell_file) + 2);

      for (p = path; p != NULL; p = p1 ? p1 + 1: NULL)

        {

          p1 = strchr (p, ':');

          if (p1 != NULL)

            len = p1 - p;

          else

            len = strlen (p);

          strncpy (tryname, p, len);

          tryname[len] = '\0';

          strcat (tryname, "/");

          strcat (tryname, shell_file);

          if (access (tryname, X_OK) < 0)

            continue;

          if (stat (tryname, &statbuf) < 0)

            continue;

          if (!S_ISREG (statbuf.st_mode))

            /* We certainly need to reject directories.  I'm not quite

               as sure about FIFOs, sockets, etc., but I kind of doubt

               that people want to exec() these things.  */

            continue;

          break;

        }

      if (p == NULL)

        /* Not found.  This must be an error rather than merely passing

           the file to execlp(), because execlp() would try all the

           exec()s, causing GDB to get confused.  */

        error (_("procfs:%d -- Can't find shell %s in PATH"),

               __LINE__, shell_file);



      shell_file = tryname;

    }



  pid = fork_inferior (exec_file, allargs, env, procfs_set_exec_trap,

                       NULL, NULL, shell_file, NULL);



  procfs_init_inferior (ops, pid);

}



/* An observer for the "inferior_created" event.  */



static void

‌procfs_inferior_created (struct target_ops *ops, int from_tty)

{

#ifdef SYS_syssgi

  /* Make sure to cancel the syssgi() syscall-exit notifications.

     They should normally have been removed by now, but they may still

     be activated if the inferior doesn't use shared libraries, or if

     we didn't locate __dbx_link, or if we never stopped in __dbx_link.

     See procfs_init_inferior() for more details.



     Since these notifications are only ever enabled when we spawned

     the inferior ourselves, there is nothing to do when the inferior

     was created by attaching to an already running process, or when

     debugging a core file.  */

  if (current_inferior ()->attach_flag || !target_can_run (&current_target))

    return;



  proc_trace_syscalls_1 (find_procinfo_or_die (ptid_get_pid (inferior_ptid),

                         0), SYS_syssgi, PR_SYSEXIT, FLAG_RESET, 0);

#endif

}



/* Callback for update_thread_list.  Calls "add_thread".  */



static int

‌procfs_notice_thread (procinfo *pi, procinfo *thread, void *ptr)

{

  ptid_t gdb_threadid = ptid_build (pi->pid, thread->tid, 0);



  if (!in_thread_list (gdb_threadid) || is_exited (gdb_threadid))

    add_thread (gdb_threadid);



  return 0;

}



/* Query all the threads that the target knows about, and give them

   back to GDB to add to its list.  */



static void

‌procfs_update_thread_list (struct target_ops *ops)

{

  procinfo *pi;



  prune_threads ();



  /* Find procinfo for main process.  */

  pi = find_procinfo_or_die (ptid_get_pid (inferior_ptid), 0);

  proc_update_threads (pi);

  proc_iterate_over_threads (pi, procfs_notice_thread, NULL);

}



/* Return true if the thread is still 'alive'.  This guy doesn't

   really seem to be doing his job.  Got to investigate how to tell

   when a thread is really gone.  */



static int

‌procfs_thread_alive (struct target_ops *ops, ptid_t ptid)

{

  int proc, thread;

  procinfo *pi;



  proc    = ptid_get_pid (ptid);

  thread  = ptid_get_lwp (ptid);

  /* If I don't know it, it ain't alive!  */

  if ((pi = find_procinfo (proc, thread)) == NULL)

    return 0;



  /* If I can't get its status, it ain't alive!

     What's more, I need to forget about it!  */

  if (!proc_get_status (pi))

    {

      destroy_procinfo (pi);

      return 0;

    }

  /* I couldn't have got its status if it weren't alive, so it's

     alive.  */

  return 1;

}



/* Convert PTID to a string.  Returns the string in a static

   buffer.  */



static char *

‌procfs_pid_to_str (struct target_ops *ops, ptid_t ptid)

{

  static char buf[80];



  if (ptid_get_lwp (ptid) == 0)

    sprintf (buf, "process %d", ptid_get_pid (ptid));

  else

    sprintf (buf, "LWP %ld", ptid_get_lwp (ptid));



  return buf;

}



/* Insert a watchpoint.  */



static int

‌procfs_set_watchpoint (ptid_t ptid, CORE_ADDR addr, int len, int rwflag,

                       int after)

{

#ifndef AIX5

  int       pflags = 0;

  procinfo *pi;



  pi = find_procinfo_or_die (ptid_get_pid (ptid) == -1 ?

                             ptid_get_pid (inferior_ptid) : ptid_get_pid (ptid),

                             0);



  /* Translate from GDB's flags to /proc's.  */

  if (len > 0)        /* len == 0 means delete watchpoint.  */

    {

      switch (rwflag) {                /* FIXME: need an enum!  */

      case hw_write:                /* default watchpoint (write) */

        pflags = WRITE_WATCHFLAG;

        break;

      case hw_read:                /* read watchpoint */

        pflags = READ_WATCHFLAG;

        break;

      case hw_access:                /* access watchpoint */

        pflags = READ_WATCHFLAG | WRITE_WATCHFLAG;

        break;

      case hw_execute:                /* execution HW breakpoint */

        pflags = EXEC_WATCHFLAG;

        break;

      default:                        /* Something weird.  Return error.  */

        return -1;

      }

      if (after)                /* Stop after r/w access is completed.  */

        pflags |= AFTER_WATCHFLAG;

    }



  if (!proc_set_watchpoint (pi, addr, len, pflags))

    {

      if (errno == E2BIG)        /* Typical error for no resources.  */

        return -1;                /* fail */

      /* GDB may try to remove the same watchpoint twice.

         If a remove request returns no match, don't error.  */

      if (errno == ESRCH && len == 0)

        return 0;                /* ignore */

      proc_error (pi, "set_watchpoint", __LINE__);

    }

#endif /* AIX5 */

  return 0;

}



/* Return non-zero if we can set a hardware watchpoint of type TYPE.  TYPE

   is one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint,

   or bp_hardware_watchpoint.  CNT is the number of watchpoints used so

   far.



   Note:  procfs_can_use_hw_breakpoint() is not yet used by all

   procfs.c targets due to the fact that some of them still define

   target_can_use_hardware_watchpoint.  */



static int

‌procfs_can_use_hw_breakpoint (struct target_ops *self,

                              int type, int cnt, int othertype)

{

  /* Due to the way that proc_set_watchpoint() is implemented, host

     and target pointers must be of the same size.  If they are not,

     we can't use hardware watchpoints.  This limitation is due to the

     fact that proc_set_watchpoint() calls

     procfs_address_to_host_pointer(); a close inspection of

     procfs_address_to_host_pointer will reveal that an internal error

     will be generated when the host and target pointer sizes are

     different.  */

  struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;



  if (sizeof (void *) != TYPE_LENGTH (ptr_type))

    return 0;



  /* Other tests here???  */



  return 1;

}



/* Returns non-zero if process is stopped on a hardware watchpoint

   fault, else returns zero.  */



static int

‌procfs_stopped_by_watchpoint (struct target_ops *ops)

{

  procinfo *pi;



  pi = find_procinfo_or_die (ptid_get_pid (inferior_ptid), 0);



  if (proc_flags (pi) & (PR_STOPPED | PR_ISTOP))

    {

      if (proc_why (pi) == PR_FAULTED)

        {

#ifdef FLTWATCH

          if (proc_what (pi) == FLTWATCH)

            return 1;

#endif

#ifdef FLTKWATCH

          if (proc_what (pi) == FLTKWATCH)

            return 1;

#endif

        }

    }

  return 0;

}



/* Returns 1 if the OS knows the position of the triggered watchpoint,

   and sets *ADDR to that address.  Returns 0 if OS cannot report that

   address.  This function is only called if

   procfs_stopped_by_watchpoint returned 1, thus no further checks are

   done.  The function also assumes that ADDR is not NULL.  */



static int

‌procfs_stopped_data_address (struct target_ops *targ, CORE_ADDR *addr)

{

  procinfo *pi;



  pi = find_procinfo_or_die (ptid_get_pid (inferior_ptid), 0);

  return proc_watchpoint_address (pi, addr);

}



static int

‌procfs_insert_watchpoint (struct target_ops *self,

                          CORE_ADDR addr, int len, int type,

                          struct expression *cond)

{

  if (!target_have_steppable_watchpoint

      && !gdbarch_have_nonsteppable_watchpoint (target_gdbarch ()))

    {

      /* When a hardware watchpoint fires off the PC will be left at

         the instruction following the one which caused the

         watchpoint.  It will *NOT* be necessary for GDB to step over

         the watchpoint.  */

      return procfs_set_watchpoint (inferior_ptid, addr, len, type, 1);

    }

  else

    {

      /* When a hardware watchpoint fires off the PC will be left at

         the instruction which caused the watchpoint.  It will be

         necessary for GDB to step over the watchpoint.  */

      return procfs_set_watchpoint (inferior_ptid, addr, len, type, 0);

    }

}



static int

‌procfs_remove_watchpoint (struct target_ops *self,

                          CORE_ADDR addr, int len, int type,

                          struct expression *cond)

{

  return procfs_set_watchpoint (inferior_ptid, addr, 0, 0, 0);

}



static int

‌procfs_region_ok_for_hw_watchpoint (struct target_ops *self,

                                    CORE_ADDR addr, int len)

{

  /* The man page for proc(4) on Solaris 2.6 and up says that the

     system can support "thousands" of hardware watchpoints, but gives

     no method for finding out how many; It doesn't say anything about

     the allowed size for the watched area either.  So we just tell

     GDB 'yes'.  */

  return 1;

}



void

‌procfs_use_watchpoints (struct target_ops *t)

{

  t->to_stopped_by_watchpoint = procfs_stopped_by_watchpoint;

  t->to_insert_watchpoint = procfs_insert_watchpoint;

  t->to_remove_watchpoint = procfs_remove_watchpoint;

  t->to_region_ok_for_hw_watchpoint = procfs_region_ok_for_hw_watchpoint;

  t->to_can_use_hw_breakpoint = procfs_can_use_hw_breakpoint;

  t->to_stopped_data_address = procfs_stopped_data_address;

}



/* Memory Mappings Functions: */



/* Call a callback function once for each mapping, passing it the

   mapping, an optional secondary callback function, and some optional

   opaque data.  Quit and return the first non-zero value returned

   from the callback.



   PI is the procinfo struct for the process to be mapped.  FUNC is

   the callback function to be called by this iterator.  DATA is the

   optional opaque data to be passed to the callback function.

   CHILD_FUNC is the optional secondary function pointer to be passed

   to the child function.  Returns the first non-zero return value

   from the callback function, or zero.  */



static int

‌iterate_over_mappings (procinfo *pi, find_memory_region_ftype child_func,

                       void *data,

                       int (*func) (struct prmap *map,

                                    find_memory_region_ftype child_func,

                                    void *data))

{

  char pathname[MAX_PROC_NAME_SIZE];

  struct prmap *prmaps;

  struct prmap *prmap;

  int funcstat;

  int map_fd;

  int nmap;

  struct cleanup *cleanups = make_cleanup (null_cleanup, NULL);

#ifdef NEW_PROC_API

  struct stat sbuf;

#endif



  /* Get the number of mappings, allocate space,

     and read the mappings into prmaps.  */

#ifdef NEW_PROC_API

  /* Open map fd.  */

  sprintf (pathname, "/proc/%d/map", pi->pid);

  if ((map_fd = open (pathname, O_RDONLY)) < 0)

    proc_error (pi, "iterate_over_mappings (open)", __LINE__);



  /* Make sure it gets closed again.  */

  make_cleanup_close (map_fd);



  /* Use stat to determine the file size, and compute

     the number of prmap_t objects it contains.  */

  if (fstat (map_fd, &sbuf) != 0)

    proc_error (pi, "iterate_over_mappings (fstat)", __LINE__);



  nmap = sbuf.st_size / sizeof (prmap_t);

  prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));

  if (read (map_fd, (char *) prmaps, nmap * sizeof (*prmaps))

      != (nmap * sizeof (*prmaps)))

    proc_error (pi, "iterate_over_mappings (read)", __LINE__);

#else

  /* Use ioctl command PIOCNMAP to get number of mappings.  */

  if (ioctl (pi->ctl_fd, PIOCNMAP, &nmap) != 0)

    proc_error (pi, "iterate_over_mappings (PIOCNMAP)", __LINE__);



  prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));

  if (ioctl (pi->ctl_fd, PIOCMAP, prmaps) != 0)

    proc_error (pi, "iterate_over_mappings (PIOCMAP)", __LINE__);

#endif



  for (prmap = prmaps; nmap > 0; prmap++, nmap--)

    if ((funcstat = (*func) (prmap, child_func, data)) != 0)

      {

        do_cleanups (cleanups);

        return funcstat;

      }



  do_cleanups (cleanups);

  return 0;

}



/* Implements the to_find_memory_regions method.  Calls an external

   function for each memory region.

   Returns the integer value returned by the callback.  */



static int

‌find_memory_regions_callback (struct prmap *map,

                              find_memory_region_ftype func, void *data)

{

  return (*func) ((CORE_ADDR) map->pr_vaddr,

                  map->pr_size,

                  (map->pr_mflags & MA_READ) != 0,

                  (map->pr_mflags & MA_WRITE) != 0,

                  (map->pr_mflags & MA_EXEC) != 0,

                  1, /* MODIFIED is unknown, pass it as true.  */

                  data);

}



/* External interface.  Calls a callback function once for each

   mapped memory region in the child process, passing as arguments:



        CORE_ADDR virtual_address,

        unsigned long size,

        int read,        TRUE if region is readable by the child

        int write,        TRUE if region is writable by the child

        int execute        TRUE if region is executable by the child.



   Stops iterating and returns the first non-zero value returned by

   the callback.  */



static int

‌proc_find_memory_regions (struct target_ops *self,

                          find_memory_region_ftype func, void *data)

{

  procinfo *pi = find_procinfo_or_die (ptid_get_pid (inferior_ptid), 0);



  return iterate_over_mappings (pi, func, data,

                                find_memory_regions_callback);

}



/* Returns an ascii representation of a memory mapping's flags.  */



static char *

‌mappingflags (long flags)

{

  static char asciiflags[8];



  strcpy (asciiflags, "-------");

#if defined (MA_PHYS)

  if (flags & MA_PHYS)

    asciiflags[0] = 'd';

#endif

  if (flags & MA_STACK)

    asciiflags[1] = 's';

  if (flags & MA_BREAK)

    asciiflags[2] = 'b';

  if (flags & MA_SHARED)

    asciiflags[3] = 's';

  if (flags & MA_READ)

    asciiflags[4] = 'r';

  if (flags & MA_WRITE)

    asciiflags[5] = 'w';

  if (flags & MA_EXEC)

    asciiflags[6] = 'x';

  return (asciiflags);

}



/* Callback function, does the actual work for 'info proc

   mappings'.  */



static int

‌info_mappings_callback (struct prmap *map, find_memory_region_ftype ignore,

                        void *unused)

{

  unsigned int pr_off;



#ifdef PCAGENT        /* Horrible hack: only defined on Solaris 2.6+ */

  pr_off = (unsigned int) map->pr_offset;

#else

  pr_off = map->pr_off;

#endif



  if (gdbarch_addr_bit (target_gdbarch ()) == 32)

    printf_filtered ("\t%#10lx %#10lx %#10lx %#10x %7s\n",

                     (unsigned long) map->pr_vaddr,

                     (unsigned long) map->pr_vaddr + map->pr_size - 1,

                     (unsigned long) map->pr_size,

                     pr_off,

                     mappingflags (map->pr_mflags));

  else

    printf_filtered ("  %#18lx %#18lx %#10lx %#10x %7s\n",

                     (unsigned long) map->pr_vaddr,

                     (unsigned long) map->pr_vaddr + map->pr_size - 1,

                     (unsigned long) map->pr_size,

                     pr_off,

                     mappingflags (map->pr_mflags));



  return 0;

}



/* Implement the "info proc mappings" subcommand.  */



static void

‌info_proc_mappings (procinfo *pi, int summary)

{

  if (summary)

    return;        /* No output for summary mode.  */



  printf_filtered (_("Mapped address spaces:\n\n"));

  if (gdbarch_ptr_bit (target_gdbarch ()) == 32)

    printf_filtered ("\t%10s %10s %10s %10s %7s\n",

                     "Start Addr",

                     "  End Addr",

                     "      Size",

                     "    Offset",

                     "Flags");

  else

    printf_filtered ("  %18s %18s %10s %10s %7s\n",

                     "Start Addr",

                     "  End Addr",

                     "      Size",

                     "    Offset",

                     "Flags");



  iterate_over_mappings (pi, NULL, NULL, info_mappings_callback);

  printf_filtered ("\n");

}



/* Implement the "info proc" command.  */



static void

‌procfs_info_proc (struct target_ops *ops, const char *args,

                  enum info_proc_what what)

{

  struct cleanup *old_chain;

  procinfo *process  = NULL;

  procinfo *thread   = NULL;

  char    **argv     = NULL;

  char     *tmp      = NULL;

  int       pid      = 0;

  int       tid      = 0;

  int       mappings = 0;



  switch (what)

    {

    case IP_MINIMAL:

      break;



    case IP_MAPPINGS:

    case IP_ALL:

      mappings = 1;

      break;



    default:

      error (_("Not supported on this target."));

    }



  old_chain = make_cleanup (null_cleanup, 0);

  if (args)

    {

      argv = gdb_buildargv (args);

      make_cleanup_freeargv (argv);

    }

  while (argv != NULL && *argv != NULL)

    {

      if (isdigit (argv[0][0]))

        {

          pid = strtoul (argv[0], &tmp, 10);

          if (*tmp == '/')

            tid = strtoul (++tmp, NULL, 10);

        }

      else if (argv[0][0] == '/')

        {

          tid = strtoul (argv[0] + 1, NULL, 10);

        }

      argv++;

    }

  if (pid == 0)

    pid = ptid_get_pid (inferior_ptid);

  if (pid == 0)

    error (_("No current process: you must name one."));

  else

    {

      /* Have pid, will travel.

         First see if it's a process we're already debugging.  */

      process = find_procinfo (pid, 0);

       if (process == NULL)

         {

           /* No.  So open a procinfo for it, but

              remember to close it again when finished.  */

           process = create_procinfo (pid, 0);

           make_cleanup (do_destroy_procinfo_cleanup, process);

           if (!open_procinfo_files (process, FD_CTL))

             proc_error (process, "info proc, open_procinfo_files", __LINE__);

         }

    }

  if (tid != 0)

    thread = create_procinfo (pid, tid);



  if (process)

    {

      printf_filtered (_("process %d flags:\n"), process->pid);

      proc_prettyprint_flags (proc_flags (process), 1);

      if (proc_flags (process) & (PR_STOPPED | PR_ISTOP))

        proc_prettyprint_why (proc_why (process), proc_what (process), 1);

      if (proc_get_nthreads (process) > 1)

        printf_filtered ("Process has %d threads.\n",

                         proc_get_nthreads (process));

    }

  if (thread)

    {

      printf_filtered (_("thread %d flags:\n"), thread->tid);

      proc_prettyprint_flags (proc_flags (thread), 1);

      if (proc_flags (thread) & (PR_STOPPED | PR_ISTOP))

        proc_prettyprint_why (proc_why (thread), proc_what (thread), 1);

    }



  if (mappings)

    {

      info_proc_mappings (process, 0);

    }



  do_cleanups (old_chain);

}



/* Modify the status of the system call identified by SYSCALLNUM in

   the set of syscalls that are currently traced/debugged.



   If ENTRY_OR_EXIT is set to PR_SYSENTRY, then the entry syscalls set

   will be updated.  Otherwise, the exit syscalls set will be updated.



   If MODE is FLAG_SET, then traces will be enabled.  Otherwise, they

   will be disabled.  */



static void

‌proc_trace_syscalls_1 (procinfo *pi, int syscallnum, int entry_or_exit,

                       int mode, int from_tty)

{

  sysset_t *sysset;



  if (entry_or_exit == PR_SYSENTRY)

    sysset = proc_get_traced_sysentry (pi, NULL);

  else

    sysset = proc_get_traced_sysexit (pi, NULL);



  if (sysset == NULL)

    proc_error (pi, "proc-trace, get_traced_sysset", __LINE__);



  if (mode == FLAG_SET)

    gdb_praddsysset (sysset, syscallnum);

  else

    gdb_prdelsysset (sysset, syscallnum);



  if (entry_or_exit == PR_SYSENTRY)

    {

      if (!proc_set_traced_sysentry (pi, sysset))

        proc_error (pi, "proc-trace, set_traced_sysentry", __LINE__);

    }

  else

    {

      if (!proc_set_traced_sysexit (pi, sysset))

        proc_error (pi, "proc-trace, set_traced_sysexit", __LINE__);

    }

}



static void

‌proc_trace_syscalls (char *args, int from_tty, int entry_or_exit, int mode)

{

  procinfo *pi;



  if (ptid_get_pid (inferior_ptid) <= 0)

    error (_("you must be debugging a process to use this command."));



  if (args == NULL || args[0] == 0)

    error_no_arg (_("system call to trace"));



  pi = find_procinfo_or_die (ptid_get_pid (inferior_ptid), 0);

  if (isdigit (args[0]))

    {

      const int syscallnum = atoi (args);



      proc_trace_syscalls_1 (pi, syscallnum, entry_or_exit, mode, from_tty);

    }

}



static void

‌proc_trace_sysentry_cmd (char *args, int from_tty)

{

  proc_trace_syscalls (args, from_tty, PR_SYSENTRY, FLAG_SET);

}



static void

‌proc_trace_sysexit_cmd (char *args, int from_tty)

{

  proc_trace_syscalls (args, from_tty, PR_SYSEXIT, FLAG_SET);

}



static void

‌proc_untrace_sysentry_cmd (char *args, int from_tty)

{

  proc_trace_syscalls (args, from_tty, PR_SYSENTRY, FLAG_RESET);

}



static void

‌proc_untrace_sysexit_cmd (char *args, int from_tty)

{

  proc_trace_syscalls (args, from_tty, PR_SYSEXIT, FLAG_RESET);

}





/* Provide a prototype to silence -Wmissing-prototypes.  */

extern void _initialize_procfs (void);



void

‌_initialize_procfs (void)

{

  observer_attach_inferior_created (procfs_inferior_created);



  add_com ("proc-trace-entry", no_class, proc_trace_sysentry_cmd,

           _("Give a trace of entries into the syscall."));

  add_com ("proc-trace-exit", no_class, proc_trace_sysexit_cmd,

           _("Give a trace of exits from the syscall."));

  add_com ("proc-untrace-entry", no_class, proc_untrace_sysentry_cmd,

           _("Cancel a trace of entries into the syscall."));

  add_com ("proc-untrace-exit", no_class, proc_untrace_sysexit_cmd,

           _("Cancel a trace of exits from the syscall."));

}



/* =================== END, GDB  "MODULE" =================== */







/* miscellaneous stubs: */



/* The following satisfy a few random symbols mostly created by the

   solaris threads implementation, which I will chase down later.  */



/* Return a pid for which we guarantee we will be able to find a

   'live' procinfo.  */



ptid_t

‌procfs_first_available (void)

{

  return pid_to_ptid (procinfo_list ? procinfo_list->pid : -1);

}



/* ===================  GCORE .NOTE "MODULE" =================== */

#if defined (PIOCOPENLWP) || defined (PCAGENT)

/* gcore only implemented on solaris (so far) */



static char *

‌procfs_do_thread_registers (bfd *obfd, ptid_t ptid,

                            char *note_data, int *note_size,

                            enum gdb_signal stop_signal)

{

  struct regcache *regcache = get_thread_regcache (ptid);

  gdb_gregset_t gregs;

  gdb_fpregset_t fpregs;

  unsigned long merged_pid;

  struct cleanup *old_chain;



  merged_pid = ptid_get_lwp (ptid) << 16 | ptid_get_pid (ptid);



  /* This part is the old method for fetching registers.

     It should be replaced by the newer one using regsets

     once it is implemented in this platform:

     gdbarch_iterate_over_regset_sections().  */



  old_chain = save_inferior_ptid ();

  inferior_ptid = ptid;

  target_fetch_registers (regcache, -1);



  fill_gregset (regcache, &gregs, -1);

#if defined (NEW_PROC_API)

  note_data = (char *) elfcore_write_lwpstatus (obfd,

                                                note_data,

                                                note_size,

                                                merged_pid,

                                                stop_signal,

                                                &gregs);

#else

  note_data = (char *) elfcore_write_prstatus (obfd,

                                               note_data,

                                               note_size,

                                               merged_pid,

                                               stop_signal,

                                               &gregs);

#endif

  fill_fpregset (regcache, &fpregs, -1);

  note_data = (char *) elfcore_write_prfpreg (obfd,

                                              note_data,

                                              note_size,

                                              &fpregs,

                                              sizeof (fpregs));



  do_cleanups (old_chain);



  return note_data;

}



‌struct procfs_corefile_thread_data {

  bfd *obfd;

  char *note_data;

  int *note_size;

  enum gdb_signal stop_signal;

};



static int

‌procfs_corefile_thread_callback (procinfo *pi, procinfo *thread, void *data)

{

  struct procfs_corefile_thread_data *args = data;



  if (pi != NULL)

    {

      ptid_t ptid = ptid_build (pi->pid, thread->tid, 0);



      args->note_data = procfs_do_thread_registers (args->obfd, ptid,

                                                    args->note_data,

                                                    args->note_size,

                                                    args->stop_signal);

    }

  return 0;

}



static int

‌find_signalled_thread (struct thread_info *info, void *data)

{

  if (info->suspend.stop_signal != GDB_SIGNAL_0

      && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid))

    return 1;



  return 0;

}



static enum gdb_signal

‌find_stop_signal (void)

{

  struct thread_info *info =

    iterate_over_threads (find_signalled_thread, NULL);



  if (info)

    return info->suspend.stop_signal;

  else

    return GDB_SIGNAL_0;

}



static char *

‌procfs_make_note_section (struct target_ops *self, bfd *obfd, int *note_size)

{

  struct cleanup *old_chain;

  gdb_gregset_t gregs;

  gdb_fpregset_t fpregs;

  char fname[16] = {'\0'};

  char psargs[80] = {'\0'};

  procinfo *pi = find_procinfo_or_die (ptid_get_pid (inferior_ptid), 0);

  char *note_data = NULL;

  char *inf_args;

  struct procfs_corefile_thread_data thread_args;

  gdb_byte *auxv;

  int auxv_len;

  enum gdb_signal stop_signal;



  if (get_exec_file (0))

    {

      strncpy (fname, lbasename (get_exec_file (0)), sizeof (fname));

      fname[sizeof (fname) - 1] = 0;

      strncpy (psargs, get_exec_file (0), sizeof (psargs));

      psargs[sizeof (psargs) - 1] = 0;



      inf_args = get_inferior_args ();

      if (inf_args && *inf_args &&

          strlen (inf_args) < ((int) sizeof (psargs) - (int) strlen (psargs)))

        {

          strncat (psargs, " ",

                   sizeof (psargs) - strlen (psargs));

          strncat (psargs, inf_args,

                   sizeof (psargs) - strlen (psargs));

        }

    }



  note_data = (char *) elfcore_write_prpsinfo (obfd,

                                               note_data,

                                               note_size,

                                               fname,

                                               psargs);



  stop_signal = find_stop_signal ();



#ifdef NEW_PROC_API

  fill_gregset (get_current_regcache (), &gregs, -1);

  note_data = elfcore_write_pstatus (obfd, note_data, note_size,

                                     ptid_get_pid (inferior_ptid),

                                     stop_signal, &gregs);

#endif



  thread_args.obfd = obfd;

  thread_args.note_data = note_data;

  thread_args.note_size = note_size;

  thread_args.stop_signal = stop_signal;

  proc_iterate_over_threads (pi, procfs_corefile_thread_callback,

                             &thread_args);

  note_data = thread_args.note_data;



  auxv_len = target_read_alloc (&current_target, TARGET_OBJECT_AUXV,

                                NULL, &auxv);

  if (auxv_len > 0)

    {

      note_data = elfcore_write_note (obfd, note_data, note_size,

                                      "CORE", NT_AUXV, auxv, auxv_len);

      xfree (auxv);

    }



  return note_data;

}

#else /* !Solaris */

static char *

‌procfs_make_note_section (struct target_ops *self, bfd *obfd, int *note_size)

{

  error (_("gcore not implemented for this host."));

  return NULL;        /* lint */

}

#endif /* Solaris */

/* ===================  END GCORE .NOTE "MODULE" =================== */
gdb/procfs.c - gdb

Global variables defined

Data types defined

Functions defined

Macros defined

Source code
