Line data    Source code

       1             : /* Invoke dup, but avoid some glitches.
       2             : 
       3             :    Copyright (C) 2001, 2004, 2005, 2006 Free Software Foundation, Inc.
       4             : 
       5             :    This program is free software: you can redistribute it and/or modify
       6             :    it under the terms of the GNU General Public License as published by
       7             :    the Free Software Foundation; either version 3 of the License, or
       8             :    (at your option) any later version.
       9             : 
      10             :    This program is distributed in the hope that it will be useful,
      11             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      12             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      13             :    GNU General Public License for more details.
      14             : 
      15             :    You should have received a copy of the GNU General Public License
      16             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
      17             : 
      18             : /* Written by Paul Eggert.  */
      19             : 
      20             : #include <config.h>
      21             : 
      22             : #include "unistd-safer.h"
      23             : 
      24             : #include <fcntl.h>
      25             : 
      26             : #include <unistd.h>
      27             : #ifndef STDERR_FILENO
      28             : # define STDERR_FILENO 2
      29             : #endif
      30             : 
      31             : /* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
      32             :    STDERR_FILENO.  */
      33             : 
      34             : int
      35      106037 : dup_safer (int fd)
      36             : {
      37             : #if defined F_DUPFD && !defined FCHDIR_REPLACEMENT
      38      106037 :   return fcntl (fd, F_DUPFD, STDERR_FILENO + 1);
      39             : #else
      40             :   /* fd_safer calls us back, but eventually the recursion unwinds and
      41             :      does the right thing.  */
      42             :   return fd_safer (dup (fd));
      43             : #endif
      44             : }