1 /* provide a replacement openat function
2 Copyright (C) 2004-2006, 2008-2009 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 */
19 #ifndef _GL_HEADER_OPENAT
20 #define _GL_HEADER_OPENAT
24 #include <sys/types.h>
31 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
32 # define __attribute__(x) /* empty */
36 #ifndef ATTRIBUTE_NORETURN
37 # define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
40 /* Work around a bug in Solaris 9 and 10: AT_FDCWD is positive. Its
41 value exceeds INT_MAX, so its use as an int doesn't conform to the
42 C standard, and GCC and Sun C complain in some cases. If the bug
43 is present, undef AT_FDCWD here, so it can be redefined below. */
44 #if 0 < AT_FDCWD && AT_FDCWD == 0xffd19553
48 /* Use the same bit pattern as Solaris 9, but with the proper
49 signedness. The bit pattern is important, in case this actually is
50 Solaris with the above workaround. */
52 # define AT_FDCWD (-3041965)
55 /* Use the same values as Solaris 9. This shouldn't matter, but
56 there's no real reason to differ. */
57 #ifndef AT_SYMLINK_NOFOLLOW
58 # define AT_SYMLINK_NOFOLLOW 4096
59 # define AT_REMOVEDIR 1
62 #ifdef __OPENAT_PREFIX
65 # define __OPENAT_CONCAT(x, y) x ## y
66 # define __OPENAT_XCONCAT(x, y) __OPENAT_CONCAT (x, y)
67 # define __OPENAT_ID(y) __OPENAT_XCONCAT (__OPENAT_PREFIX, y)
68 # define openat __OPENAT_ID (openat)
69 int openat (int fd, char const *file, int flags, /* mode_t mode */ ...);
70 int openat_permissive (int fd, char const *file, int flags, mode_t mode,
72 # define fstatat __OPENAT_ID (fstatat)
73 int fstatat (int fd, char const *file, struct stat *st, int flag);
74 # define unlinkat __OPENAT_ID (unlinkat)
75 int unlinkat (int fd, char const *file, int flag);
76 bool openat_needs_fchdir (void);
80 # define openat_permissive(Fd, File, Flags, Mode, Cwd_errno) \
81 openat (Fd, File, Flags, Mode)
82 # define openat_needs_fchdir() false
86 #if HAVE_OPENAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
87 int rpl_fstatat (int fd, char const *file, struct stat *st, int flag);
88 # if !COMPILING_FSTATAT
90 # define fstatat rpl_fstatat
94 int mkdirat (int fd, char const *file, mode_t mode);
95 void openat_restore_fail (int) ATTRIBUTE_NORETURN;
96 void openat_save_fail (int) ATTRIBUTE_NORETURN;
97 int fchmodat (int fd, char const *file, mode_t mode, int flag);
98 int fchownat (int fd, char const *file, uid_t owner, gid_t group, int flag);
100 /* Using these function names makes application code
101 slightly more readable than it would be with
102 fchownat (..., 0) or fchownat (..., AT_SYMLINK_NOFOLLOW). */
104 chownat (int fd, char const *file, uid_t owner, gid_t group)
106 return fchownat (fd, file, owner, group, 0);
110 lchownat (int fd, char const *file, uid_t owner, gid_t group)
112 return fchownat (fd, file, owner, group, AT_SYMLINK_NOFOLLOW);
116 chmodat (int fd, char const *file, mode_t mode)
118 return fchmodat (fd, file, mode, 0);
122 lchmodat (int fd, char const *file, mode_t mode)
124 return fchmodat (fd, file, mode, AT_SYMLINK_NOFOLLOW);
127 #endif /* _GL_HEADER_OPENAT */