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 #include <config.h>
  25
  26
  27 #include "openat.h"
  28 #include <stdarg.h>
  29 #include <stddef.h>
  30 #include <errno.h>
  31
  32 #include "fcntl--.h"
  33 #include "lstat.h"
  34 #include "save-cwd.h"
  35
  36
  37 /* The presence of unistd.h is assumed by gnulib these days, so we
  38  * might as well assume it too.
  39  */
  40 #include <unistd.h> /* for readlink() */
  41
  42 #ifdef HAVE_LOCALE_H
  43 #include <locale.h>
  44 #endif
  45
  46 #if ENABLE_NLS
  47 # include <libintl.h>
  48 # define _(Text) gettext (Text)
  49 #else
  50 # define _(Text) Text
  51 #define textdomain(Domain)
  52 #define bindtextdomain(Package, Directory)
  53 #endif
  54 #ifdef gettext_noop
  55 # define N_(String) gettext_noop (String)
  56 #else
  57 /* See locate.c for explanation as to why not use (String) */
  58 # define N_(String) String
  59 #endif
  60
  61
  62
  63 int
  64 run_in_dir (int dirfd, int (*callback)(void*), void *usercontext)
  65 {
  66   if (dirfd == AT_FDCWD)
  67     {
  68       return (*callback)(usercontext);
  69     }
  70   else
  71     {
  72       struct saved_cwd saved_cwd;
  73       int saved_errno;
  74       int err;
  75
  76       if (save_cwd (&saved_cwd) != 0)
  77         openat_save_fail (errno);
  78
  79       if (fchdir (dirfd) != 0)
  80         {
  81           saved_errno = errno;
  82           free_cwd (&saved_cwd);
  83           errno = saved_errno;
  84       return -1;
  85         }
  86
  87       err = (*callback)(usercontext);
  88       saved_errno = (err < 0 ? errno : 0);
  89
  90       if (restore_cwd (&saved_cwd) != 0)
  91         openat_restore_fail (errno);
  92
  93       free_cwd (&saved_cwd);
  94
  95       if (saved_errno)
  96         errno = saved_errno;
  97       return err;
  98     }
  99 }