+++ /dev/null
-#ifndef _BABELTRACE_COMPAT_FCNTL_H
-#define _BABELTRACE_COMPAT_FCNTL_H
-
-/*
- * babeltrace/compat/fcntl.h
- *
- * Copyright 2015 (c) - Jérémie Galarneau <jeremie.galarneau@efficios.com>
- *
- * fcntl compatibility layer.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
-
-#ifdef BABELTRACE_HAVE_POSIX_FALLOCATE
-
-#include <fcntl.h>
-
-static inline
-int bt_posix_fallocate(int fd, off_t offset, off_t len)
-{
- return posix_fallocate(fd, offset, len);
-}
-
-#else /* #ifdef BABELTRACE_HAVE_POSIX_FALLOCATE */
-
-#include <sys/types.h>
-#include <unistd.h>
-#include <string.h>
-
-#define BABELTRACE_FALLOCATE_BUFLEN 256
-
-#ifndef min_t
-#define min_t(type, a, b) \
- ((type) (a) < (type) (b) ? (type) (a) : (type) (b))
-#endif
-
-static inline
-int bt_posix_fallocate(int fd, off_t offset, off_t len)
-{
- int ret = 0;
- ssize_t copy_len;
- char buf[BABELTRACE_FALLOCATE_BUFLEN];
- off_t i, file_pos, orig_end_offset, range_end;
-
- if (offset < 0 || len < 0) {
- ret = EINVAL;
- goto end;
- }
-
- range_end = offset + len;
- if (range_end < 0) {
- ret = EFBIG;
- goto end;
- }
-
- file_pos = lseek(fd, 0, SEEK_CUR);
- if (file_pos < 0) {
- ret = errno;
- goto end;
- }
-
- orig_end_offset = lseek(fd, 0, SEEK_END);
- if (orig_end_offset < 0) {
- ret = errno;
- goto end;
- }
-
- /* Seek back to original position. */
- ret = lseek(fd, file_pos, SEEK_SET);
- if (ret) {
- ret = errno;
- goto end;
- }
-
- /*
- * The file may not need to grow, but we want to ensure the
- * space has actually been reserved by the file system. First, copy
- * the "existing" region of the file, then grow the file if needed.
- */
- for (i = file_pos; i < min_t(off_t, range_end, orig_end_offset);
- i += copy_len) {
- ssize_t copy_ret;
-
- copy_len = min_t(size_t, BABELTRACE_FALLOCATE_BUFLEN,
- min_t(off_t, range_end - i,
- orig_end_offset - i));
- copy_ret = pread(fd, &buf, copy_len, i);
- if (copy_ret < copy_len) {
- /*
- * The caller must handle any EINTR.
- * POSIX_FALLOCATE(3) does not mention EINTR.
- * However, glibc does forward to fallocate()
- * directly on Linux, which may be interrupted.
- */
- ret = errno;
- goto end;
- }
-
- copy_ret = pwrite(fd, &buf, copy_len, i);
- if (copy_ret < copy_len) {
- /* Same caveat as noted at pread() */
- ret = errno;
- goto end;
- }
- }
-
- /* Grow file, as necessary. */
- memset(&buf, 0, BABELTRACE_FALLOCATE_BUFLEN);
- for (i = orig_end_offset; i < range_end; i += copy_len) {
- ssize_t write_ret;
-
- copy_len = min_t(size_t, BABELTRACE_FALLOCATE_BUFLEN,
- range_end - i);
- write_ret = pwrite(fd, &buf, copy_len, i);
- if (write_ret < copy_len) {
- ret = errno;
- goto end;
- }
- }
-end:
- return ret;
-}
-#endif /* #else #ifdef BABELTRACE_HAVE_POSIX_FALLOCATE */
-
-
-#ifdef BABELTRACE_HAVE_FACCESSAT
-
-#include <fcntl.h>
-#include <unistd.h>
-
-static inline
-int bt_faccessat(int dirfd, const char *dirname,
- const char *pathname, int mode, int flags)
-{
- return faccessat(dirfd, pathname, mode, flags);
-}
-
-#else /* #ifdef BABELTRACE_HAVE_FACCESSAT */
-
-#include <string.h>
-#include <unistd.h>
-
-static inline
-int bt_faccessat(int dirfd, const char *dirname,
- const char *pathname, int mode, int flags)
-{
- char cpath[PATH_MAX];
-
- if (flags != 0) {
- errno = EINVAL;
- return -1;
- }
- /* Includes middle / and final \0. */
- if (strlen(dirname) + strlen(pathname) + 2 > PATH_MAX) {
- return -1;
- }
- strcpy(cpath, dirname);
- strcat(cpath, "/");
- strcat(cpath, pathname);
- return access(cpath, mode);
-}
-
-#endif /* #else #ifdef BABELTRACE_HAVE_FACCESSAT */
-
-#endif /* _BABELTRACE_COMPAT_FCNTL_H */
projects / babeltrace.git / blobdiff