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/* listfile.c -- run a function in a specific directory
Copyright (C) 2007-2023 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/>.
*/
/* This file was written by James Youngman, based on gnulib'c at-func.c.
*/
/* config.h must be included first. */
#include <config.h>
/* system headers. */
#include <errno.h>
#include <stdarg.h>
#include <sys/stat.h>
/* gnulib headers. */
#include "fcntl--.h"
#include "openat.h"
#include "save-cwd.h"
/* find headers. */
#include "dircallback.h"
int
run_in_dir (const struct saved_cwd *there,
int (*callback)(void*), void *usercontext)
{
int err = -1;
int saved_errno = 0;
struct saved_cwd here;
if (0 == save_cwd (&here))
{
if (0 == restore_cwd (there))
{
err = callback(usercontext);
saved_errno = (err < 0 ? errno : 0);
}
else
{
openat_restore_fail (errno);
}
if (restore_cwd (&here) != 0)
openat_restore_fail (errno);
free_cwd (&here);
}
else
{
openat_save_fail (errno);
}
if (saved_errno)
errno = saved_errno;
return err;
}
int
run_in_dirfd (int dir_fd, int (*callback)(void*), void *usercontext)
{
if (dir_fd == AT_FDCWD)
{
return (*callback)(usercontext);
}
else
{
struct saved_cwd saved_cwd;
int saved_errno;
int err;
if (save_cwd (&saved_cwd) != 0)
openat_save_fail (errno);
if (fchdir (dir_fd) != 0)
{
saved_errno = errno;
free_cwd (&saved_cwd);
errno = saved_errno;
return -1;
}
err = (*callback)(usercontext);
saved_errno = (err < 0 ? errno : 0);
if (restore_cwd (&saved_cwd) != 0)
openat_restore_fail (errno);
free_cwd (&saved_cwd);
if (saved_errno)
errno = saved_errno;
return err;
}
}
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