kc3-lang/gnulib/lib/fopen-safer.c

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• Hash : ae5dae6f
  Author :
  Date : 2009-01-19T09:27:47
  

  unistd: guarantee STDIN_FILENO here, for OS/2 EMX
  
  * lib/unistd.in.h (STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO):
  Guarantee a definition.
  * doc/posix-headers/unistd.texi (unistd.h): Document the bug.
  * modules/unistd-safer (Depends-on): Add dependency on unistd.
  * lib/c-stack.c (STDERR_FILENO): Rely on <unistd.h>.
  * lib/dup-safer.c (STDERR_FILENO): Likewise.
  * lib/execute.c (STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO):
  Likewise.
  * lib/fd-safer.c (STDIN_FILENO, STDERR_FILENO): Likewise.
  * lib/fopen-safer.c (STDERR_FILENO): Likewise.
  * lib/pipe.c (STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO):
  Likewise.
  * lib/tmpfile-safer.c (STDERR_FILENO): Likewise.
  * tests/test-posix_spawn1.c (STDIN_FILENO, STDOUT_FILENO)
  (STDERR_FILENO): Likewise.
  * tests/test-posix_spawn2.c (STDIN_FILENO, STDOUT_FILENO)
  (STDERR_FILENO): Likewise.
  * tests/test-posix_spawn3.c (STDIN_FILENO, STDOUT_FILENO)
  (STDERR_FILENO): Likewise.
  Reported by Elbert Pol.
  
  Signed-off-by: Eric Blake <ebb9@byu.net>
  

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• lib/fopen-safer.c

• /* Invoke fopen, but avoid some glitches.
  
     Copyright (C) 2001, 2004, 2005, 2006, 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/>.  */
  
  /* Written by Paul Eggert.  */
  
  #include <config.h>
  
  #include "stdio-safer.h"
  
  #include <errno.h>
  #include <unistd.h>
  #include "unistd-safer.h"
  
  /* Like fopen, but do not return stdin, stdout, or stderr.  */
  
  FILE *
  fopen_safer (char const *file, char const *mode)
  {
    FILE *fp = fopen (file, mode);
  
    if (fp)
      {
        int fd = fileno (fp);
  
        if (0 <= fd && fd <= STDERR_FILENO)
  	{
  	  int f = dup_safer (fd);
  
  	  if (f < 0)
  	    {
  	      int e = errno;
  	      fclose (fp);
  	      errno = e;
  	      return NULL;
  	    }
  
  	  if (fclose (fp) != 0
  	      || ! (fp = fdopen (f, mode)))
  	    {
  	      int e = errno;
  	      close (f);
  	      errno = e;
  	      return NULL;
  	    }
  	}
      }
  
    return fp;
  }
  

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