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. */
32 /* fstatat should always follow symbolic links that end in /, but on
33 Solaris 9 it doesn't if AT_SYMLINK_NOFOLLOW is specified.
34 Likewise, trailing slash on a non-directory should be an error.
35 These are the same problems that lstat.c and stat.c address, so
36 solve it in a similar way. */
39 rpl_fstatat (int fd, char const *file, struct stat *st, int flag)
41 int result = fstatat (fd, file, st, flag);
47 if (flag & AT_SYMLINK_NOFOLLOW)
49 /* Fix lstat behavior. */
50 if (file[len - 1] != '/' || S_ISDIR (st->st_mode))
52 if (!S_ISLNK (st->st_mode))
57 result = fstatat (fd, file, st, flag & ~AT_SYMLINK_NOFOLLOW);
59 /* Fix stat behavior. */
60 if (result == 0 && !S_ISDIR (st->st_mode) && file[len - 1] == '/')
68 #else /* !HAVE_FSTATAT */
70 /* On mingw, the gnulib <sys/stat.h> defines `stat' as a function-like
71 macro; but using it in AT_FUNC_F2 causes compilation failure
72 because the preprocessor sees a use of a macro that requires two
73 arguments but is only given one. Hence, we need an inline
74 forwarder to get past the preprocessor. */
76 stat_func (char const *name, struct stat *st)
78 return stat (name, st);
81 /* Likewise, if there is no native `lstat', then the gnulib
82 <sys/stat.h> defined it as stat, which also needs adjustment. */
85 # define lstat stat_func
88 /* Replacement for Solaris' function by the same name.
89 <http://www.google.com/search?q=fstatat+site:docs.sun.com>
90 First, try to simulate it via l?stat ("/proc/self/fd/FD/FILE").
91 Failing that, simulate it via save_cwd/fchdir/(stat|lstat)/restore_cwd.
92 If either the save_cwd or the restore_cwd fails (relatively unlikely),
93 then give a diagnostic and exit nonzero.
94 Otherwise, this function works just like Solaris' fstatat. */
96 # define AT_FUNC_NAME fstatat
97 # define AT_FUNC_F1 lstat
98 # define AT_FUNC_F2 stat_func
99 # define AT_FUNC_USE_F1_COND AT_SYMLINK_NOFOLLOW
100 # define AT_FUNC_POST_FILE_PARAM_DECLS , struct stat *st, int flag
101 # define AT_FUNC_POST_FILE_ARGS , st
102 # include "at-func.c"
106 # undef AT_FUNC_USE_F1_COND
107 # undef AT_FUNC_POST_FILE_PARAM_DECLS
108 # undef AT_FUNC_POST_FILE_ARGS
110 #endif /* !HAVE_FSTATAT */