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src/os/unix/ngx_files.c - nginx-1.7.10
Global variables defined
Functions defined
Macros defined
Source code
- #include <ngx_config.h>
- #include <ngx_core.h>
- #if (NGX_HAVE_FILE_AIO)
- ngx_uint_t ngx_file_aio = 1;
- #endif
- ssize_t
- ngx_read_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset)
- {
- ssize_t n;
- ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0,
- "read: %d, %p, %uz, %O", file->fd, buf, size, offset);
- #if (NGX_HAVE_PREAD)
- n = pread(file->fd, buf, size, offset);
- if (n == -1) {
- ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
- "pread() \"%s\" failed", file->name.data);
- return NGX_ERROR;
- }
- #else
- if (file->sys_offset != offset) {
- if (lseek(file->fd, offset, SEEK_SET) == -1) {
- ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
- "lseek() \"%s\" failed", file->name.data);
- return NGX_ERROR;
- }
- file->sys_offset = offset;
- }
- n = read(file->fd, buf, size);
- if (n == -1) {
- ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
- "read() \"%s\" failed", file->name.data);
- return NGX_ERROR;
- }
- file->sys_offset += n;
- #endif
- file->offset += n;
- return n;
- }
- ssize_t
- ngx_write_file(ngx_file_t *file, u_char *buf, size_t size, off_t offset)
- {
- ssize_t n, written;
- ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0,
- "write: %d, %p, %uz, %O", file->fd, buf, size, offset);
- written = 0;
- #if (NGX_HAVE_PWRITE)
- for ( ;; ) {
- n = pwrite(file->fd, buf + written, size, offset);
- if (n == -1) {
- ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
- "pwrite() \"%s\" failed", file->name.data);
- return NGX_ERROR;
- }
- file->offset += n;
- written += n;
- if ((size_t) n == size) {
- return written;
- }
- offset += n;
- size -= n;
- }
- #else
- if (file->sys_offset != offset) {
- if (lseek(file->fd, offset, SEEK_SET) == -1) {
- ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
- "lseek() \"%s\" failed", file->name.data);
- return NGX_ERROR;
- }
- file->sys_offset = offset;
- }
- for ( ;; ) {
- n = write(file->fd, buf + written, size);
- if (n == -1) {
- ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
- "write() \"%s\" failed", file->name.data);
- return NGX_ERROR;
- }
- file->offset += n;
- written += n;
- if ((size_t) n == size) {
- return written;
- }
- size -= n;
- }
- #endif
- }
- ngx_fd_t
- ngx_open_tempfile(u_char *name, ngx_uint_t persistent, ngx_uint_t access)
- {
- ngx_fd_t fd;
- fd = open((const char *) name, O_CREAT|O_EXCL|O_RDWR,
- access ? access : 0600);
- if (fd != -1 && !persistent) {
- (void) unlink((const char *) name);
- }
- return fd;
- }
- #define NGX_IOVS 8
- ssize_t
- ngx_write_chain_to_file(ngx_file_t *file, ngx_chain_t *cl, off_t offset,
- ngx_pool_t *pool)
- {
- u_char *prev;
- size_t size;
- ssize_t total, n;
- ngx_array_t vec;
- struct iovec *iov, iovs[NGX_IOVS];
-
- if (cl->next == NULL) {
- return ngx_write_file(file, cl->buf->pos,
- (size_t) (cl->buf->last - cl->buf->pos),
- offset);
- }
- total = 0;
- vec.elts = iovs;
- vec.size = sizeof(struct iovec);
- vec.nalloc = NGX_IOVS;
- vec.pool = pool;
- do {
- prev = NULL;
- iov = NULL;
- size = 0;
- vec.nelts = 0;
-
- while (cl && vec.nelts < IOV_MAX) {
- if (prev == cl->buf->pos) {
- iov->iov_len += cl->buf->last - cl->buf->pos;
- } else {
- iov = ngx_array_push(&vec);
- if (iov == NULL) {
- return NGX_ERROR;
- }
- iov->iov_base = (void *) cl->buf->pos;
- iov->iov_len = cl->buf->last - cl->buf->pos;
- }
- size += cl->buf->last - cl->buf->pos;
- prev = cl->buf->last;
- cl = cl->next;
- }
-
- if (vec.nelts == 1) {
- iov = vec.elts;
- n = ngx_write_file(file, (u_char *) iov[0].iov_base,
- iov[0].iov_len, offset);
- if (n == NGX_ERROR) {
- return n;
- }
- return total + n;
- }
- if (file->sys_offset != offset) {
- if (lseek(file->fd, offset, SEEK_SET) == -1) {
- ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
- "lseek() \"%s\" failed", file->name.data);
- return NGX_ERROR;
- }
- file->sys_offset = offset;
- }
- n = writev(file->fd, vec.elts, vec.nelts);
- if (n == -1) {
- ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
- "writev() \"%s\" failed", file->name.data);
- return NGX_ERROR;
- }
- if ((size_t) n != size) {
- ngx_log_error(NGX_LOG_CRIT, file->log, 0,
- "writev() \"%s\" has written only %z of %uz",
- file->name.data, n, size);
- return NGX_ERROR;
- }
- ngx_log_debug2(NGX_LOG_DEBUG_CORE, file->log, 0,
- "writev: %d, %z", file->fd, n);
- file->sys_offset += n;
- file->offset += n;
- offset += n;
- total += n;
- } while (cl);
- return total;
- }
- ngx_int_t
- ngx_set_file_time(u_char *name, ngx_fd_t fd, time_t s)
- {
- struct timeval tv[2];
- tv[0].tv_sec = ngx_time();
- tv[0].tv_usec = 0;
- tv[1].tv_sec = s;
- tv[1].tv_usec = 0;
- if (utimes((char *) name, tv) != -1) {
- return NGX_OK;
- }
- return NGX_ERROR;
- }
- ngx_int_t
- ngx_create_file_mapping(ngx_file_mapping_t *fm)
- {
- fm->fd = ngx_open_file(fm->name, NGX_FILE_RDWR, NGX_FILE_TRUNCATE,
- NGX_FILE_DEFAULT_ACCESS);
- if (fm->fd == NGX_INVALID_FILE) {
- ngx_log_error(NGX_LOG_CRIT, fm->log, ngx_errno,
- ngx_open_file_n " \"%s\" failed", fm->name);
- return NGX_ERROR;
- }
- if (ftruncate(fm->fd, fm->size) == -1) {
- ngx_log_error(NGX_LOG_CRIT, fm->log, ngx_errno,
- "ftruncate() \"%s\" failed", fm->name);
- goto failed;
- }
- fm->addr = mmap(NULL, fm->size, PROT_READ|PROT_WRITE, MAP_SHARED,
- fm->fd, 0);
- if (fm->addr != MAP_FAILED) {
- return NGX_OK;
- }
- ngx_log_error(NGX_LOG_CRIT, fm->log, ngx_errno,
- "mmap(%uz) \"%s\" failed", fm->size, fm->name);
- failed:
- if (ngx_close_file(fm->fd) == NGX_FILE_ERROR) {
- ngx_log_error(NGX_LOG_ALERT, fm->log, ngx_errno,
- ngx_close_file_n " \"%s\" failed", fm->name);
- }
- return NGX_ERROR;
- }
- void
- ngx_close_file_mapping(ngx_file_mapping_t *fm)
- {
- if (munmap(fm->addr, fm->size) == -1) {
- ngx_log_error(NGX_LOG_CRIT, fm->log, ngx_errno,
- "munmap(%uz) \"%s\" failed", fm->size, fm->name);
- }
- if (ngx_close_file(fm->fd) == NGX_FILE_ERROR) {
- ngx_log_error(NGX_LOG_ALERT, fm->log, ngx_errno,
- ngx_close_file_n " \"%s\" failed", fm->name);
- }
- }
- ngx_int_t
- ngx_open_dir(ngx_str_t *name, ngx_dir_t *dir)
- {
- dir->dir = opendir((const char *) name->data);
- if (dir->dir == NULL) {
- return NGX_ERROR;
- }
- dir->valid_info = 0;
- return NGX_OK;
- }
- ngx_int_t
- ngx_read_dir(ngx_dir_t *dir)
- {
- dir->de = readdir(dir->dir);
- if (dir->de) {
- #if (NGX_HAVE_D_TYPE)
- dir->type = dir->de->d_type;
- #else
- dir->type = 0;
- #endif
- return NGX_OK;
- }
- return NGX_ERROR;
- }
- ngx_int_t
- ngx_open_glob(ngx_glob_t *gl)
- {
- int n;
- n = glob((char *) gl->pattern, 0, NULL, &gl->pglob);
- if (n == 0) {
- return NGX_OK;
- }
- #ifdef GLOB_NOMATCH
- if (n == GLOB_NOMATCH && gl->test) {
- return NGX_OK;
- }
- #endif
- return NGX_ERROR;
- }
- ngx_int_t
- ngx_read_glob(ngx_glob_t *gl, ngx_str_t *name)
- {
- size_t count;
- #ifdef GLOB_NOMATCH
- count = (size_t) gl->pglob.gl_pathc;
- #else
- count = (size_t) gl->pglob.gl_matchc;
- #endif
- if (gl->n < count) {
- name->len = (size_t) ngx_strlen(gl->pglob.gl_pathv[gl->n]);
- name->data = (u_char *) gl->pglob.gl_pathv[gl->n];
- gl->n++;
- return NGX_OK;
- }
- return NGX_DONE;
- }
- void
- ngx_close_glob(ngx_glob_t *gl)
- {
- globfree(&gl->pglob);
- }
- ngx_err_t
- ngx_trylock_fd(ngx_fd_t fd)
- {
- struct flock fl;
- ngx_memzero(&fl, sizeof(struct flock));
- fl.l_type = F_WRLCK;
- fl.l_whence = SEEK_SET;
- if (fcntl(fd, F_SETLK, &fl) == -1) {
- return ngx_errno;
- }
- return 0;
- }
- ngx_err_t
- ngx_lock_fd(ngx_fd_t fd)
- {
- struct flock fl;
- ngx_memzero(&fl, sizeof(struct flock));
- fl.l_type = F_WRLCK;
- fl.l_whence = SEEK_SET;
- if (fcntl(fd, F_SETLKW, &fl) == -1) {
- return ngx_errno;
- }
- return 0;
- }
- ngx_err_t
- ngx_unlock_fd(ngx_fd_t fd)
- {
- struct flock fl;
- ngx_memzero(&fl, sizeof(struct flock));
- fl.l_type = F_UNLCK;
- fl.l_whence = SEEK_SET;
- if (fcntl(fd, F_SETLK, &fl) == -1) {
- return ngx_errno;
- }
- return 0;
- }
- #if (NGX_HAVE_POSIX_FADVISE) && !(NGX_HAVE_F_READAHEAD)
- ngx_int_t
- ngx_read_ahead(ngx_fd_t fd, size_t n)
- {
- int err;
- err = posix_fadvise(fd, 0, 0, POSIX_FADV_SEQUENTIAL);
- if (err == 0) {
- return 0;
- }
- ngx_set_errno(err);
- return NGX_FILE_ERROR;
- }
- #endif
- #if (NGX_HAVE_O_DIRECT)
- ngx_int_t
- ngx_directio_on(ngx_fd_t fd)
- {
- int flags;
- flags = fcntl(fd, F_GETFL);
- if (flags == -1) {
- return NGX_FILE_ERROR;
- }
- return fcntl(fd, F_SETFL, flags | O_DIRECT);
- }
- ngx_int_t
- ngx_directio_off(ngx_fd_t fd)
- {
- int flags;
- flags = fcntl(fd, F_GETFL);
- if (flags == -1) {
- return NGX_FILE_ERROR;
- }
- return fcntl(fd, F_SETFL, flags & ~O_DIRECT);
- }
- #endif
- #if (NGX_HAVE_STATFS)
- size_t
- ngx_fs_bsize(u_char *name)
- {
- struct statfs fs;
- if (statfs((char *) name, &fs) == -1) {
- return 512;
- }
- if ((fs.f_bsize % 512) != 0) {
- return 512;
- }
- return (size_t) fs.f_bsize;
- }
- #elif (NGX_HAVE_STATVFS)
- size_t
- ngx_fs_bsize(u_char *name)
- {
- struct statvfs fs;
- if (statvfs((char *) name, &fs) == -1) {
- return 512;
- }
- if ((fs.f_frsize % 512) != 0) {
- return 512;
- }
- return (size_t) fs.f_frsize;
- }
- #else
- size_t
- ngx_fs_bsize(u_char *name)
- {
- return 512;
- }
- #endif
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