lib/dircallback.c

   1 /* listfile.c -- run a function in a specific directory
   2    Copyright (C) 2007 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software
  16    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  17    USA.
  18 */
  19
  20 /* This file was written by James Youngman, based on gnulib'c at-func.c.
  21  */
  22
  23
  24 #if HAVE_CONFIG_H
  25 # include <config.h>
  26 #endif
  27
  28 #include "openat.h"
  29 #include <stdarg.h>
  30 #include <stddef.h>
  31
  32 #include "fcntl--.h"
  33 #include "lchown.h"
  34 #include "lstat.h"
  35 #include "save-cwd.h"
  36
  37
  38 /* The presence of unistd.h is assumed by gnulib these days, so we
  39  * might as well assume it too.
  40  */
  41 #include <unistd.h> /* for readlink() */
  42
  43 #ifdef HAVE_LOCALE_H
  44 #include <locale.h>
  45 #endif
  46
  47 #if ENABLE_NLS
  48 # include <libintl.h>
  49 # define _(Text) gettext (Text)
  50 #else
  51 # define _(Text) Text
  52 #define textdomain(Domain)
  53 #define bindtextdomain(Package, Directory)
  54 #endif
  55 #ifdef gettext_noop
  56 # define N_(String) gettext_noop (String)
  57 #else
  58 /* See locate.c for explanation as to why not use (String) */
  59 # define N_(String) String
  60 #endif
  61
  62
  63
  64 int
  65 run_in_dir (int dirfd, int (*callback)(void*), void *usercontext)
  66 {
  67   if (dirfd == AT_FDCWD)
  68     {
  69       return (*callback)(usercontext);
  70     }
  71   else
  72     {
  73       struct saved_cwd saved_cwd;
  74       int saved_errno;
  75       int err;
  76
  77       if (save_cwd (&saved_cwd) != 0)
  78         openat_save_fail (errno);
  79
  80       if (fchdir (dirfd) != 0)
  81         {
  82           saved_errno = errno;
  83           free_cwd (&saved_cwd);
  84           errno = saved_errno;
  85       return -1;
  86         }
  87
  88       err = (*callback)(usercontext);
  89       saved_errno = (err < 0 ? errno : 0);
  90
  91       if (restore_cwd (&saved_cwd) != 0)
  92         openat_restore_fail (errno);
  93
  94       free_cwd (&saved_cwd);
  95
  96       if (saved_errno)
  97         errno = saved_errno;
  98       return err;
  99     }
 100 }
 101