runtime/dyninst/print.c - systemtap

Functions defined

Macros defined

Source code

/* -*- linux-c -*-
* Print Functions
* Copyright (C) 2012 Red Hat Inc.
*
* This file is part of systemtap, and is free software.  You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/

#ifndef _STAPDYN_PRINT_C_
‌#define _STAPDYN_PRINT_C_

#ifdef STP_BULKMODE
#error "Bulk mode output (percpu files) not supported for --runtime=dyninst"
#endif
#ifdef STP_USE_RING_BUFFER
#error "Ring buffer output not supported for --runtime=dyninst"
#endif
#if defined(RELAY_GUEST) || defined(RELAY_HOST)
#error "Relay host/guest output not supported for --runtime=dyninst"
#endif

#include "transport.c"
#include "vsprintf.c"

‌static void _stp_print_kernel_info(char *vstr, int ctx, int num_probes)
{
    // nah...
}

‌static int _stp_print_init(void)
{
    /* Since 'print_buf' is now in the context structure (see
     * common_probe_context.h), there isn't anything to do for
     * regular print buffers. */
    return 0;
}

‌static void _stp_print_cleanup(void)
{
    /* Since 'print_buf' is now in the context structure (see
     * common_probe_context.h), there isn't anything to free for
     * it. */
}

‌static inline void _stp_print_flush(void)
{
    _stp_dyninst_transport_write();
    return;
}

‌static void * _stp_reserve_bytes (int numbytes)
{
    return _stp_dyninst_transport_reserve_bytes(numbytes);
}

#ifndef STP_MAXBINARYARGS
‌#define STP_MAXBINARYARGS 127
#endif

‌static void _stp_unreserve_bytes (int numbytes)
{
    _stp_dyninst_transport_unreserve_bytes(numbytes);
    return;
}

/** Write 64-bit args directly into the output stream.
* This function takes a variable number of 64-bit arguments
* and writes them directly into the output stream.  Marginally faster
* than doing the same in _stp_vsnprintf().
* @sa _stp_vsnprintf()
*/
‌static void _stp_print_binary (int num, ...)
{
    va_list vargs;
    int i;
    int64_t *args;

    if (unlikely(num > STP_MAXBINARYARGS))
        num = STP_MAXBINARYARGS;

    args = _stp_reserve_bytes(num * sizeof(int64_t));

    if (likely(args != NULL)) {
        va_start(vargs, num);
        for (i = 0; i < num; i++) {
            args[i] = va_arg(vargs, int64_t);
        }
        va_end(vargs);
    }
}

‌static void _stp_printf (const char *fmt, ...)
{
    va_list args;
    va_start(args, fmt);
    _stp_vsnprintf(NULL, 0, fmt, args);
    va_end(args);
}

‌static void _stp_print (const char *str)
{
    _stp_printf("%s", str);
}

‌static void _stp_print_char (const char c)
{
    char *p = _stp_reserve_bytes(1);;

    if (p) {
        *p = c;
    }
}

#endif /* _STAPDYN_PRINT_C_ */