1: /* Change the protections of file relative to an open directory.
    2:    Copyright (C) 2006 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 Foundation,
   16:    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
   17: 
   18: /* written by Jim Meyering */
   19: 
   20: #include <config.h>
   21: 
   22: #include "openat.h"
   23: #include "dirname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
   24: #include "save-cwd.h"
   25: #include "openat-priv.h"
   26: 
   27: #ifndef HAVE_LCHMOD
   28: /* Use a different name, to avoid conflicting with any
   29:    system-supplied declaration.  */
   30: # undef lchmod
   31: # define lchmod lchmod_rpl
   32: static int lchmod (char const *f, mode_t m) { errno = ENOSYS; return -1; }
   33: #endif
   34: 
   35: /* Solaris 10 has no function like this.
   36:    Invoke chmod or lchmod on file, FILE, using mode MODE, in the directory
   37:    open on descriptor FD.  If possible, do it without changing the
   38:    working directory.  Otherwise, resort to using save_cwd/fchdir,
   39:    then mkdir/restore_cwd.  If either the save_cwd or the restore_cwd
   40:    fails, then give a diagnostic and exit nonzero.
   41:    Note that an attempt to use a FLAG value of AT_SYMLINK_NOFOLLOW
   42:    on a system without lchmod support causes this function to fail.  */
   43: 
   44: #define AT_FUNC_NAME fchmodat
   45: #define AT_FUNC_F1 lchmod
   46: #define AT_FUNC_F2 chmod
   47: #define AT_FUNC_USE_F1_COND flag == AT_SYMLINK_NOFOLLOW
   48: #define AT_FUNC_POST_FILE_PARAM_DECLS , mode_t mode, int flag
   49: #define AT_FUNC_POST_FILE_ARGS        , mode
   50: #include "at-func.c"