kc3-lang/gnulib/lib/fchownat.c

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• Hash : 242003f6
  Author :
  Date : 2006-12-24T17:08:04
  

  Work around an fchownat bug in glibc-2.4:
  http://lists.ubuntu.com/archives/ubuntu-users/2006-September/093218.html
  This bug would cause "chown -RP ... DIR" to follow symlinks in DIR,
  in spite of the -P option.
  * m4/openat.m4 (gl_FUNC_FCHOWNAT, gl_FUNC_FCHOWNAT_DEREF_BUG):
  New macros.
  (gl_PREREQ_OPENAT): Require gl_FUNC_FCHOWNAT.
  * modules/openat (Files): Add lib/fchownat.c.
  * lib/openat.c (fchownat): Don't define here.  Move to...
  * lib/fchownat.c: ...this new file.
  

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• lib/fchownat.c

• /* This function serves as replacement for a missing fchownat function,
     as well as a work around for the fchownat bug in glibc-2.4:
      <http://lists.ubuntu.com/archives/ubuntu-users/2006-September/093218.html>
     when the buggy fchownat-with-AT_SYMLINK_NOFOLLOW operates on a symlink, it
     mistakenly affects the symlink referent, rather than the symlink itself.
  
     Copyright (C) 2006 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 2, 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, write to the Free Software Foundation,
     Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  
  /* written by Jim Meyering */
  
  #include <config.h>
  
  #include "openat.h"
  
  #include <unistd.h>
  
  #include "dirname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
  #include "save-cwd.h"
  #include "openat-priv.h"
  
  /* Replacement for Solaris' function by the same name.
     Invoke chown or lchown on file, FILE, using OWNER and GROUP, in the
     directory open on descriptor FD.  If FLAG is AT_SYMLINK_NOFOLLOW, then
     use lchown, otherwise, use chown.  If possible, do it without changing
     the working directory.  Otherwise, resort to using save_cwd/fchdir,
     then mkdir/restore_cwd.  If either the save_cwd or the restore_cwd
     fails, then give a diagnostic and exit nonzero.  */
  
  #define AT_FUNC_NAME fchownat
  #define AT_FUNC_F1 lchown
  #define AT_FUNC_F2 chown
  #define AT_FUNC_USE_F1_COND flag == AT_SYMLINK_NOFOLLOW
  #define AT_FUNC_POST_FILE_PARAM_DECLS , uid_t owner, gid_t group, int flag
  #define AT_FUNC_POST_FILE_ARGS        , owner, group
  #include "at-func.c"
  

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