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);
49 # ifndef FSTATAT_AT_FDCWD_0_BROKEN
50 # define FSTATAT_AT_FDCWD_0_BROKEN 0
53 # ifndef LSTAT_FOLLOWS_SLASHED_SYMLINK
54 # define LSTAT_FOLLOWS_SLASHED_SYMLINK 0
57 /* fstatat should always follow symbolic links that end in /, but on
58 Solaris 9 it doesn't if AT_SYMLINK_NOFOLLOW is specified.
59 Likewise, trailing slash on a non-directory should be an error.
60 These are the same problems that lstat.c and stat.c address, so
61 solve it in a similar way.
63 AIX 7.1 fstatat (AT_FDCWD, ..., 0) always fails, which is a bug.
64 Work around this bug if FSTATAT_AT_FDCWD_0_BROKEN is nonzero. */
67 rpl_fstatat (int fd, char const *file, struct stat *st, int flag)
70 (FSTATAT_AT_FDCWD_0_BROKEN && fd == AT_FDCWD && flag == 0
72 : orig_fstatat (fd, file, st, flag));
75 if (LSTAT_FOLLOWS_SLASHED_SYMLINK || result != 0)
78 if (flag & AT_SYMLINK_NOFOLLOW)
80 /* Fix lstat behavior. */
81 if (file[len - 1] != '/' || S_ISDIR (st->st_mode))
83 if (!S_ISLNK (st->st_mode))
88 result = fstatat (fd, file, st, flag & ~AT_SYMLINK_NOFOLLOW);
90 /* Fix stat behavior. */
91 if (result == 0 && !S_ISDIR (st->st_mode) && file[len - 1] == '/')
99 #else /* !HAVE_FSTATAT */
101 /* On mingw, the gnulib <sys/stat.h> defines `stat' as a function-like
102 macro; but using it in AT_FUNC_F2 causes compilation failure
103 because the preprocessor sees a use of a macro that requires two
104 arguments but is only given one. Hence, we need an inline
105 forwarder to get past the preprocessor. */
107 stat_func (char const *name, struct stat *st)
109 return stat (name, st);
112 /* Likewise, if there is no native `lstat', then the gnulib
113 <sys/stat.h> defined it as stat, which also needs adjustment. */
116 # define lstat stat_func
119 /* Replacement for Solaris' function by the same name.
120 <http://www.google.com/search?q=fstatat+site:docs.sun.com>
121 First, try to simulate it via l?stat ("/proc/self/fd/FD/FILE").
122 Failing that, simulate it via save_cwd/fchdir/(stat|lstat)/restore_cwd.
123 If either the save_cwd or the restore_cwd fails (relatively unlikely),
124 then give a diagnostic and exit nonzero.
125 Otherwise, this function works just like Solaris' fstatat. */
127 # define AT_FUNC_NAME fstatat
128 # define AT_FUNC_F1 lstat
129 # define AT_FUNC_F2 stat_func
130 # define AT_FUNC_USE_F1_COND AT_SYMLINK_NOFOLLOW
131 # define AT_FUNC_POST_FILE_PARAM_DECLS , struct stat *st, int flag
132 # define AT_FUNC_POST_FILE_ARGS , st
133 # include "at-func.c"
137 # undef AT_FUNC_USE_F1_COND
138 # undef AT_FUNC_POST_FILE_PARAM_DECLS
139 # undef AT_FUNC_POST_FILE_ARGS
141 #endif /* !HAVE_FSTATAT */