/* provide a replacement openat function
- Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
+ Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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 2, or (at your option)
- any later version.
+ 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
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, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* written by Jim Meyering */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
#include "openat.h"
#include <stdarg.h>
#include <stddef.h>
+#include <sys/stat.h>
#include "dirname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
#include "fcntl--.h"
-#include "lstat.h"
#include "openat-priv.h"
#include "save-cwd.h"
return open (file, flags, mode);
{
- char *proc_file;
- BUILD_PROC_NAME (proc_file, fd, file);
- err = open (proc_file, flags, mode);
- /* If the syscall succeeds, or if it fails with an unexpected
- errno value, then return right away. Otherwise, fall through
- and resort to using save_cwd/restore_cwd. */
- if (0 <= err || ! EXPECTED_ERRNO (errno))
- return err;
+ char buf[OPENAT_BUFFER_SIZE];
+ char *proc_file = openat_proc_name (buf, fd, file);
+ if (proc_file)
+ {
+ int open_result = open (proc_file, flags, mode);
+ int open_errno = errno;
+ if (proc_file != buf)
+ free (proc_file);
+ /* If the syscall succeeds, or if it fails with an unexpected
+ errno value, then return right away. Otherwise, fall through
+ and resort to using save_cwd/restore_cwd. */
+ if (0 <= open_result || ! EXPECTED_ERRNO (open_errno))
+ {
+ errno = open_errno;
+ return open_result;
+ }
+ }
}
save_ok = (save_cwd (&saved_cwd) == 0);
bool
openat_needs_fchdir (void)
{
- int fd2;
+ bool needs_fchdir = true;
int fd = open ("/", O_RDONLY);
- char *proc_file;
- if (fd < 0)
- return true;
- BUILD_PROC_NAME (proc_file, fd, ".");
- fd2 = open (proc_file, O_RDONLY);
- close (fd);
- if (0 <= fd2)
- close (fd2);
+ if (0 <= fd)
+ {
+ char buf[OPENAT_BUFFER_SIZE];
+ char *proc_file = openat_proc_name (buf, fd, ".");
+ if (proc_file)
+ {
+ needs_fchdir = false;
+ if (proc_file != buf)
+ free (proc_file);
+ }
+ close (fd);
+ }
- return fd2 < 0;
+ return needs_fchdir;
}
#if !HAVE_FDOPENDIR
int saved_errno;
DIR *dir;
- char *proc_file;
- BUILD_PROC_NAME (proc_file, fd, ".");
- dir = opendir (proc_file);
- saved_errno = errno;
+ char buf[OPENAT_BUFFER_SIZE];
+ char *proc_file = openat_proc_name (buf, fd, ".");
+ if (proc_file)
+ {
+ dir = opendir (proc_file);
+ saved_errno = errno;
+ }
+ else
+ {
+ dir = NULL;
+ saved_errno = EOPNOTSUPP;
+ }
/* If the syscall fails with an expected errno value, resort to
save_cwd/restore_cwd. */
if (dir)
close (fd);
+ if (proc_file != buf)
+ free (proc_file);
errno = saved_errno;
return dir;
}
#undef AT_FUNC_USE_F1_COND
#undef AT_FUNC_POST_FILE_PARAM_DECLS
#undef AT_FUNC_POST_FILE_ARGS
-
-/* Replacement for Solaris' function by the same name.
- Invoke chown or lchown on file, FILE, using OWNER and GROUP, in the
- directory open on descriptor FD. If FLAG is AT_SYMLINK_NOFOLLOW, then
- use lchown, otherwise, use chown. If possible, do it without changing
- the working directory. Otherwise, resort to using save_cwd/fchdir,
- then mkdir/restore_cwd. If either the save_cwd or the restore_cwd
- fails, then give a diagnostic and exit nonzero. */
-
-#define AT_FUNC_NAME fchownat
-#define AT_FUNC_F1 lchown
-#define AT_FUNC_F2 chown
-#define AT_FUNC_USE_F1_COND flag == AT_SYMLINK_NOFOLLOW
-#define AT_FUNC_POST_FILE_PARAM_DECLS , uid_t owner, gid_t group, int flag
-#define AT_FUNC_POST_FILE_ARGS , owner, group
-#include "at-func.c"