1 /* provide a replacement openat function
2 Copyright (C) 2004, 2005, 2006, 2008 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* written by Jim Meyering */
21 #include <sys/types.h>
28 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
29 # define __attribute__(x) /* empty */
33 #ifndef ATTRIBUTE_NORETURN
34 # define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
37 /* Work around a bug in Solaris 9 and 10: AT_FDCWD is positive. Its
38 value exceeds INT_MAX, so its use as an int doesn't conform to the
39 C standard, and GCC and Sun C complain in some cases. If the bug
40 is present, undef AT_FDCWD here, so it can be redefined below. */
41 #if 0 < AT_FDCWD && AT_FDCWD == 0xffd19553
45 /* Use the same bit pattern as Solaris 9, but with the proper
46 signedness. The bit pattern is important, in case this actually is
47 Solaris with the above workaround. */
49 # define AT_FDCWD (-3041965)
52 /* Use the same values as Solaris 9. This shouldn't matter, but
53 there's no real reason to differ. */
54 #ifndef AT_SYMLINK_NOFOLLOW
55 # define AT_SYMLINK_NOFOLLOW 4096
56 # define AT_REMOVEDIR 1
59 #ifdef __OPENAT_PREFIX
62 # define __OPENAT_CONCAT(x, y) x ## y
63 # define __OPENAT_XCONCAT(x, y) __OPENAT_CONCAT (x, y)
64 # define __OPENAT_ID(y) __OPENAT_XCONCAT (__OPENAT_PREFIX, y)
65 # define openat __OPENAT_ID (openat)
66 int openat (int fd, char const *file, int flags, /* mode_t mode */ ...);
67 int openat_permissive (int fd, char const *file, int flags, mode_t mode,
70 # define fdopendir __OPENAT_ID (fdopendir)
72 DIR *fdopendir (int fd);
73 # define fstatat __OPENAT_ID (fstatat)
74 int fstatat (int fd, char const *file, struct stat *st, int flag);
75 # define unlinkat __OPENAT_ID (unlinkat)
76 int unlinkat (int fd, char const *file, int flag);
77 bool openat_needs_fchdir (void);
81 # define openat_permissive(Fd, File, Flags, Mode, Cwd_errno) \
82 openat (Fd, File, Flags, Mode)
83 # define openat_needs_fchdir() false
87 #if HAVE_OPENAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
88 int rpl_fstatat (int fd, char const *file, struct stat *st, int flag);
89 # if !COMPILING_FSTATAT
91 # define fstatat rpl_fstatat
95 int mkdirat (int fd, char const *file, mode_t mode);
96 void openat_restore_fail (int) ATTRIBUTE_NORETURN;
97 void openat_save_fail (int) ATTRIBUTE_NORETURN;
98 int fchmodat (int fd, char const *file, mode_t mode, int flag);
99 int fchownat (int fd, char const *file, uid_t owner, gid_t group, int flag);
101 /* Using these function names makes application code
102 slightly more readable than it would be with
103 fchownat (..., 0) or fchownat (..., AT_SYMLINK_NOFOLLOW). */
105 chownat (int fd, char const *file, uid_t owner, gid_t group)
107 return fchownat (fd, file, owner, group, 0);
111 lchownat (int fd, char const *file, uid_t owner, gid_t group)
113 return fchownat (fd, file, owner, group, AT_SYMLINK_NOFOLLOW);
117 chmodat (int fd, char const *file, mode_t mode)
119 return fchmodat (fd, file, mode, 0);
123 lchmodat (int fd, char const *file, mode_t mode)
125 return fchmodat (fd, file, mode, AT_SYMLINK_NOFOLLOW);