1 /* provide a replacement openat function
2 Copyright (C) 2004, 2005, 2006 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 2, or (at your option)
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, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* written by Jim Meyering */
22 #include <sys/types.h>
29 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
30 # define __attribute__(x) /* empty */
34 #ifndef ATTRIBUTE_NORETURN
35 # define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
38 /* Work around a bug in Solaris 9 and 10: AT_FDCWD is positive. Its
39 value exceeds INT_MAX, so its use as an int doesn't conform to the
40 C standard, and GCC and Sun C complain in some cases. If the bug
41 is present, undef AT_FDCWD here, so it can be redefined below. */
42 #if 0 < AT_FDCWD && AT_FDCWD == 0xffd19553
46 /* Use the same bit pattern as Solaris 9, but with the proper
47 signedness. The bit pattern is important, in case this actually is
48 Solaris with the above workaround. */
50 # define AT_FDCWD (-3041965)
53 /* Use the same values as Solaris 9. This shouldn't matter, but
54 there's no real reason to differ. */
55 #ifndef AT_SYMLINK_NOFOLLOW
56 # define AT_SYMLINK_NOFOLLOW 4096
57 # define AT_REMOVEDIR 1
60 #ifdef __OPENAT_PREFIX
63 # define __OPENAT_CONCAT(x, y) x ## y
64 # define __OPENAT_XCONCAT(x, y) __OPENAT_CONCAT (x, y)
65 # define __OPENAT_ID(y) __OPENAT_XCONCAT (__OPENAT_PREFIX, y)
66 # define openat __OPENAT_ID (openat)
67 int openat (int fd, char const *file, int flags, /* mode_t mode */ ...);
68 int openat_permissive (int fd, char const *file, int flags, mode_t mode,
71 # define fdopendir __OPENAT_ID (fdopendir)
73 DIR *fdopendir (int fd);
74 # define fstatat __OPENAT_ID (fstatat)
75 int fstatat (int fd, char const *file, struct stat *st, int flag);
76 # define unlinkat __OPENAT_ID (unlinkat)
77 int unlinkat (int fd, char const *file, int flag);
78 bool openat_needs_fchdir (void);
82 # define openat_permissive(Fd, File, Flags, Mode, Cwd_errno) \
83 openat (Fd, File, Flags, Mode)
84 # define openat_needs_fchdir() false
88 #if HAVE_OPENAT && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
89 int rpl_fstatat (int fd, char const *file, struct stat *st, int flag);
90 # if !COMPILING_FSTATAT
92 # define fstatat rpl_fstatat
96 int mkdirat (int fd, char const *file, mode_t mode);
97 void openat_restore_fail (int) ATTRIBUTE_NORETURN;
98 void openat_save_fail (int) ATTRIBUTE_NORETURN;
99 int fchmodat (int fd, char const *file, mode_t mode, int flag);
100 int fchownat (int fd, char const *file, uid_t owner, gid_t group, int flag);
102 /* Using these function names makes application code
103 slightly more readable than it would be with
104 fchownat (..., 0) or fchownat (..., AT_SYMLINK_NOFOLLOW). */
106 chownat (int fd, char const *file, uid_t owner, gid_t group)
108 return fchownat (fd, file, owner, group, 0);
112 lchownat (int fd, char const *file, uid_t owner, gid_t group)
114 return fchownat (fd, file, owner, group, AT_SYMLINK_NOFOLLOW);
118 chmodat (int fd, char const *file, mode_t mode)
120 return fchmodat (fd, file, mode, 0);
124 lchmodat (int fd, char const *file, mode_t mode)
126 return fchmodat (fd, file, mode, AT_SYMLINK_NOFOLLOW);