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/* Work around an fstatat bug on Solaris 9.
Copyright (C) 2006, 2009 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 <http://www.gnu.org/licenses/>. */
/* Written by Paul Eggert and Jim Meyering. */
#include <config.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#if HAVE_FSTATAT
# undef fstatat
/* 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. */
int
rpl_fstatat (int fd, char const *file, struct stat *st, int flag)
{
int result = fstatat (fd, file, st, flag);
size_t len;
if (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 = 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 */
/* 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 inline 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.
<http://www.google.com/search?q=fstatat+site:docs.sun.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 */
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