123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148 |
- /* Work around an fstatat bug on Solaris 9.
- Copyright (C) 2006, 2009-2021 Free Software Foundation, Inc.
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <https://www.gnu.org/licenses/>. */
- /* Written by Paul Eggert and Jim Meyering. */
- /* If the user's config.h happens to include <sys/stat.h>, let it include only
- the system's <sys/stat.h> here, so that orig_fstatat doesn't recurse to
- rpl_fstatat. */
- #define __need_system_sys_stat_h
- #include <config.h>
- /* Get the original definition of fstatat. It might be defined as a macro. */
- #include <sys/types.h>
- #include <sys/stat.h>
- #undef __need_system_sys_stat_h
- #if HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG
- static int
- orig_fstatat (int fd, char const *filename, struct stat *buf, int flags)
- {
- return fstatat (fd, filename, buf, flags);
- }
- #endif
- #ifdef __osf__
- /* Write "sys/stat.h" here, not <sys/stat.h>, otherwise OSF/1 5.1 DTK cc
- eliminates this include because of the preliminary #include <sys/stat.h>
- above. */
- # include "sys/stat.h"
- #else
- # include <sys/stat.h>
- #endif
- #include "stat-time.h"
- #include <errno.h>
- #include <fcntl.h>
- #include <stdlib.h>
- #include <string.h>
- #if HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG
- # ifndef LSTAT_FOLLOWS_SLASHED_SYMLINK
- # define LSTAT_FOLLOWS_SLASHED_SYMLINK 0
- # endif
- static int
- normal_fstatat (int fd, char const *file, struct stat *st, int flag)
- {
- return stat_time_normalize (orig_fstatat (fd, file, st, flag), st);
- }
- /* fstatat should always follow symbolic links that end in /, but on
- Solaris 9 it doesn't if AT_SYMLINK_NOFOLLOW is specified.
- Likewise, trailing slash on a non-directory should be an error.
- These are the same problems that lstat.c and stat.c address, so
- solve it in a similar way.
- AIX 7.1 fstatat (AT_FDCWD, ..., 0) always fails, which is a bug.
- Work around this bug if FSTATAT_AT_FDCWD_0_BROKEN is nonzero. */
- int
- rpl_fstatat (int fd, char const *file, struct stat *st, int flag)
- {
- int result = normal_fstatat (fd, file, st, flag);
- size_t len;
- if (LSTAT_FOLLOWS_SLASHED_SYMLINK || result != 0)
- return result;
- len = strlen (file);
- if (flag & AT_SYMLINK_NOFOLLOW)
- {
- /* Fix lstat behavior. */
- if (file[len - 1] != '/' || S_ISDIR (st->st_mode))
- return 0;
- if (!S_ISLNK (st->st_mode))
- {
- errno = ENOTDIR;
- return -1;
- }
- result = normal_fstatat (fd, file, st, flag & ~AT_SYMLINK_NOFOLLOW);
- }
- /* Fix stat behavior. */
- if (result == 0 && !S_ISDIR (st->st_mode) && file[len - 1] == '/')
- {
- errno = ENOTDIR;
- return -1;
- }
- return result;
- }
- #else /* ! (HAVE_FSTATAT && HAVE_WORKING_FSTATAT_ZERO_FLAG) */
- /* On mingw, the gnulib <sys/stat.h> defines 'stat' as a function-like
- macro; but using it in AT_FUNC_F2 causes compilation failure
- because the preprocessor sees a use of a macro that requires two
- arguments but is only given one. Hence, we need an inline
- forwarder to get past the preprocessor. */
- static int
- stat_func (char const *name, struct stat *st)
- {
- return stat (name, st);
- }
- /* Likewise, if there is no native 'lstat', then the gnulib
- <sys/stat.h> defined it as stat, which also needs adjustment. */
- # if !HAVE_LSTAT
- # undef lstat
- # define lstat stat_func
- # endif
- /* Replacement for Solaris' function by the same name.
- <https://www.google.com/search?q=fstatat+site:docs.oracle.com>
- First, try to simulate it via l?stat ("/proc/self/fd/FD/FILE").
- Failing that, simulate it via save_cwd/fchdir/(stat|lstat)/restore_cwd.
- If either the save_cwd or the restore_cwd fails (relatively unlikely),
- then give a diagnostic and exit nonzero.
- Otherwise, this function works just like Solaris' fstatat. */
- # define AT_FUNC_NAME fstatat
- # define AT_FUNC_F1 lstat
- # define AT_FUNC_F2 stat_func
- # define AT_FUNC_USE_F1_COND AT_SYMLINK_NOFOLLOW
- # define AT_FUNC_POST_FILE_PARAM_DECLS , struct stat *st, int flag
- # define AT_FUNC_POST_FILE_ARGS , st
- # include "at-func.c"
- # undef AT_FUNC_NAME
- # undef AT_FUNC_F1
- # undef AT_FUNC_F2
- # undef AT_FUNC_USE_F1_COND
- # undef AT_FUNC_POST_FILE_PARAM_DECLS
- # undef AT_FUNC_POST_FILE_ARGS
- #endif /* !HAVE_FSTATAT */
|