1 /* Work around an fstatat bug on Solaris 9.
3 Copyright (C) 2006, 2009-2011 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18 /* Written by Paul Eggert and Jim Meyering. */
20 /* If the user's config.h happens to include <sys/stat.h>, let it include only
21 the system's <sys/stat.h> here, so that orig_fstatat doesn't recurse to
23 #define __need_system_sys_stat_h
26 /* Get the original definition of fstatat. It might be defined as a macro. */
27 #include <sys/types.h>
29 #undef __need_system_sys_stat_h
33 orig_fstatat (int fd, char const *filename, struct stat *buf, int flags)
35 return fstatat (fd, filename, buf, flags);
45 #if HAVE_FSTATAT && !FSTATAT_ZERO_FLAG_BROKEN
47 # ifndef LSTAT_FOLLOWS_SLASHED_SYMLINK
48 # define LSTAT_FOLLOWS_SLASHED_SYMLINK 0
51 /* fstatat should always follow symbolic links that end in /, but on
52 Solaris 9 it doesn't if AT_SYMLINK_NOFOLLOW is specified.
53 Likewise, trailing slash on a non-directory should be an error.
54 These are the same problems that lstat.c and stat.c address, so
55 solve it in a similar way.
57 AIX 7.1 fstatat (AT_FDCWD, ..., 0) always fails, which is a bug.
58 Work around this bug if FSTATAT_AT_FDCWD_0_BROKEN is nonzero. */
61 rpl_fstatat (int fd, char const *file, struct stat *st, int flag)
63 int result = orig_fstatat (fd, file, st, flag);
66 if (LSTAT_FOLLOWS_SLASHED_SYMLINK || result != 0)
69 if (flag & AT_SYMLINK_NOFOLLOW)
71 /* Fix lstat behavior. */
72 if (file[len - 1] != '/' || S_ISDIR (st->st_mode))
74 if (!S_ISLNK (st->st_mode))
79 result = orig_fstatat (fd, file, st, flag & ~AT_SYMLINK_NOFOLLOW);
81 /* Fix stat behavior. */
82 if (result == 0 && !S_ISDIR (st->st_mode) && file[len - 1] == '/')
90 #else /* !HAVE_FSTATAT || FSTATAT_ZERO_FLAG_BROKEN */
92 /* On mingw, the gnulib <sys/stat.h> defines `stat' as a function-like
93 macro; but using it in AT_FUNC_F2 causes compilation failure
94 because the preprocessor sees a use of a macro that requires two
95 arguments but is only given one. Hence, we need an inline
96 forwarder to get past the preprocessor. */
98 stat_func (char const *name, struct stat *st)
100 return stat (name, st);
103 /* Likewise, if there is no native `lstat', then the gnulib
104 <sys/stat.h> defined it as stat, which also needs adjustment. */
107 # define lstat stat_func
110 /* Replacement for Solaris' function by the same name.
111 <http://www.google.com/search?q=fstatat+site:docs.sun.com>
112 First, try to simulate it via l?stat ("/proc/self/fd/FD/FILE").
113 Failing that, simulate it via save_cwd/fchdir/(stat|lstat)/restore_cwd.
114 If either the save_cwd or the restore_cwd fails (relatively unlikely),
115 then give a diagnostic and exit nonzero.
116 Otherwise, this function works just like Solaris' fstatat. */
118 # if FSTATAT_ZERO_FLAG_BROKEN
119 # define AT_FUNC_NAME rpl_fstatat
121 # define AT_FUNC_NAME fstatat
123 # define AT_FUNC_F1 lstat
124 # define AT_FUNC_F2 stat_func
125 # define AT_FUNC_USE_F1_COND AT_SYMLINK_NOFOLLOW
126 # define AT_FUNC_POST_FILE_PARAM_DECLS , struct stat *st, int flag
127 # define AT_FUNC_POST_FILE_ARGS , st
128 # include "at-func.c"
132 # undef AT_FUNC_USE_F1_COND
133 # undef AT_FUNC_POST_FILE_PARAM_DECLS
134 # undef AT_FUNC_POST_FILE_ARGS
136 #endif /* !HAVE_FSTATAT */