148 lines
4.6 KiB
C
148 lines
4.6 KiB
C
/* Work around an fstatat bug on Solaris 9.
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Copyright (C) 2006, 2009-2022 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert and Jim Meyering. */
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/* If the user's config.h happens to include <sys/stat.h>, let it include only
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the system's <sys/stat.h> here, so that orig_fstatat doesn't recurse to
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rpl_fstatat. */
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#define __need_system_sys_stat_h
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#include <config.h>
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/* Get the original definition of fstatat. It might be defined as a macro. */
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#include <sys/types.h>
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#include <sys/stat.h>
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#undef __need_system_sys_stat_h
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#if HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG
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static int
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orig_fstatat (int fd, char const *filename, struct stat *buf, int flags)
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{
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return fstatat (fd, filename, buf, flags);
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}
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#endif
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#ifdef __osf__
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/* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
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eliminates this include because of the preliminary #include <sys/stat.h>
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above. */
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# include "sys/stat.h"
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#else
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# include <sys/stat.h>
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#endif
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#include "stat-time.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#if HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG
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# ifndef LSTAT_FOLLOWS_SLASHED_SYMLINK
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# define LSTAT_FOLLOWS_SLASHED_SYMLINK 0
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# endif
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static int
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normal_fstatat (int fd, char const *file, struct stat *st, int flag)
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{
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return stat_time_normalize (orig_fstatat (fd, file, st, flag), st);
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}
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/* fstatat should always follow symbolic links that end in /, but on
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Solaris 9 it doesn't if AT_SYMLINK_NOFOLLOW is specified.
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Likewise, trailing slash on a non-directory should be an error.
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These are the same problems that lstat.c and stat.c address, so
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solve it in a similar way.
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AIX 7.1 fstatat (AT_FDCWD, ..., 0) always fails, which is a bug.
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Work around this bug if FSTATAT_AT_FDCWD_0_BROKEN is nonzero. */
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int
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rpl_fstatat (int fd, char const *file, struct stat *st, int flag)
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{
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int result = normal_fstatat (fd, file, st, flag);
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size_t len;
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if (LSTAT_FOLLOWS_SLASHED_SYMLINK || result != 0)
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return result;
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len = strlen (file);
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if (flag & AT_SYMLINK_NOFOLLOW)
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{
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/* Fix lstat behavior. */
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if (file[len - 1] != '/' || S_ISDIR (st->st_mode))
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return 0;
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if (!S_ISLNK (st->st_mode))
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{
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errno = ENOTDIR;
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return -1;
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}
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result = normal_fstatat (fd, file, st, flag & ~AT_SYMLINK_NOFOLLOW);
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}
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/* Fix stat behavior. */
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if (result == 0 && !S_ISDIR (st->st_mode) && file[len - 1] == '/')
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{
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errno = ENOTDIR;
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return -1;
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}
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return result;
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}
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#else /* ! (HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG) */
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/* On mingw, the gnulib <sys/stat.h> defines 'stat' as a function-like
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macro; but using it in AT_FUNC_F2 causes compilation failure
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because the preprocessor sees a use of a macro that requires two
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arguments but is only given one. Hence, we need an inline
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forwarder to get past the preprocessor. */
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static int
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stat_func (char const *name, struct stat *st)
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{
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return stat (name, st);
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}
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/* Likewise, if there is no native 'lstat', then the gnulib
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<sys/stat.h> defined it as stat, which also needs adjustment. */
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# if !HAVE_LSTAT
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# undef lstat
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# define lstat stat_func
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# endif
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/* Replacement for Solaris' function by the same name.
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<https://www.google.com/search?q=fstatat+site:docs.oracle.com>
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First, try to simulate it via l?stat ("/proc/self/fd/FD/FILE").
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Failing that, simulate it via save_cwd/fchdir/(stat|lstat)/restore_cwd.
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If either the save_cwd or the restore_cwd fails (relatively unlikely),
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then give a diagnostic and exit nonzero.
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Otherwise, this function works just like Solaris' fstatat. */
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# define AT_FUNC_NAME fstatat
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# define AT_FUNC_F1 lstat
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# define AT_FUNC_F2 stat_func
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# define AT_FUNC_USE_F1_COND AT_SYMLINK_NOFOLLOW
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# define AT_FUNC_POST_FILE_PARAM_DECLS , struct stat *st, int flag
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# define AT_FUNC_POST_FILE_ARGS , st
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# include "at-func.c"
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# undef AT_FUNC_NAME
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# undef AT_FUNC_F1
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# undef AT_FUNC_F2
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# undef AT_FUNC_USE_F1_COND
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# undef AT_FUNC_POST_FILE_PARAM_DECLS
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# undef AT_FUNC_POST_FILE_ARGS
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#endif /* !HAVE_FSTATAT */
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