1: /* This function serves as replacement for a missing fchownat function,
    2:    as well as a work around for the fchownat bug in glibc-2.4:
    3:     <http://lists.ubuntu.com/archives/ubuntu-users/2006-September/093218.html>
    4:    when the buggy fchownat-with-AT_SYMLINK_NOFOLLOW operates on a symlink, it
    5:    mistakenly affects the symlink referent, rather than the symlink itself.
    6: 
    7:    Copyright (C) 2006-2007 Free Software Foundation, Inc.
    8: 
    9:    This program is free software; you can redistribute it and/or modify
   10:    it under the terms of the GNU General Public License as published by
   11:    the Free Software Foundation; either version 2, or (at your option)
   12:    any later version.
   13: 
   14:    This program is distributed in the hope that it will be useful,
   15:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   16:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   17:    GNU General Public License for more details.
   18: 
   19:    You should have received a copy of the GNU General Public License
   20:    along with this program; if not, write to the Free Software Foundation,
   21:    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
   22: 
   23: /* written by Jim Meyering */
   24: 
   25: #include <config.h>
   26: 
   27: #include "openat.h"
   28: 
   29: #include <unistd.h>
   30: 
   31: #include "dirname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
   32: #include "lchown.h"
   33: #include "save-cwd.h"
   34: #include "openat-priv.h"
   35: 
   36: /* Replacement for Solaris' function by the same name.
   37:    Invoke chown or lchown on file, FILE, using OWNER and GROUP, in the
   38:    directory open on descriptor FD.  If FLAG is AT_SYMLINK_NOFOLLOW, then
   39:    use lchown, otherwise, use chown.  If possible, do it without changing
   40:    the working directory.  Otherwise, resort to using save_cwd/fchdir,
   41:    then mkdir/restore_cwd.  If either the save_cwd or the restore_cwd
   42:    fails, then give a diagnostic and exit nonzero.  */
   43: 
   44: #define AT_FUNC_NAME fchownat
   45: #define AT_FUNC_F1 lchown
   46: #define AT_FUNC_F2 chown
   47: #define AT_FUNC_USE_F1_COND flag == AT_SYMLINK_NOFOLLOW
   48: #define AT_FUNC_POST_FILE_PARAM_DECLS , uid_t owner, gid_t group, int flag
   49: #define AT_FUNC_POST_FILE_ARGS        , owner, group
   50: #include "at-func.c"