kc3-lang/gnulib/lib/openat-die.c

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• Hash : 996f76cd
  Author :
  Date : 2009-09-19T07:12:15
  

  openat: allow return of fd 0
  
  Partially reverts patch fc33350 from 2009-09-02.
  
  * modules/chdir-long (Depends-on): Relax openat-safer to openat.
  * modules/save-cwd (Depends-on): Replace fcntl-safer with
  unistd-safer.
  * lib/chdir-long.c (includes): Replace "fcntl--.h" with
  <fcntl.h>; this module does not leak fds.
  * lib/openat.c (includes): Do not use "fcntl_safer"; plain openat
  must be allowed to return 0, leaving openat_safer to add the
  safety.
  (openat_permissive): Avoid writing to just-opened fd 2 if
  restoring the current directory fails.
  * lib/openat-die.c (openat_restore_fail): Add comment.
  * lib/save-cwd.c (includes): Make "fcntl--.h" conditional.
  (save_cwd): Guarantee safe fd, but without use of open_safer.
  * tests/test-openat.c: New test.
  * modules/openat-tests (Files, Makefile.am): Distribute and build
  new file.
  
  Signed-off-by: Eric Blake <ebb9@byu.net>
  

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• lib/openat-die.c

• /* Report a save- or restore-cwd failure in our openat replacement and then exit.
  
     Copyright (C) 2005, 2006, 2008-2009 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  #include "openat.h"
  
  #include <stdlib.h>
  
  #include "error.h"
  #include "exitfail.h"
  
  #include "gettext.h"
  #define _(msgid) gettext (msgid)
  
  void
  openat_save_fail (int errnum)
  {
    error (exit_failure, errnum,
  	 _("unable to record current working directory"));
  
    /* The `noreturn' attribute cannot be applied to error, since it returns
       when its first argument is 0.  To help compilers understand that this
       function does not return, call abort.  Also, the abort is a
       safety feature if exit_failure is 0 (which shouldn't happen).  */
    abort ();
  }
  
  
  /* Exit with an error about failure to restore the working directory
     during an openat emulation.  The caller must ensure that fd 2 is
     not a just-opened fd, even when openat_safer is not in use.  */
  
  void
  openat_restore_fail (int errnum)
  {
    error (exit_failure, errnum,
  	 _("failed to return to initial working directory"));
  
    /* As above.  */
    abort ();
  }
  

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