149 lines
4.6 KiB
C
149 lines
4.6 KiB
C
/* Work around an fstatat bug on Solaris 9.
|
|
|
|
Copyright (C) 2006, 2009-2023 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 */
|