Line data    Source code

       1             : /* closexec.c - set or clear the close-on-exec descriptor flag
       2             : 
       3             :    Copyright (C) 1991, 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             :    The code is taken from glibc/manual/llio.texi  */
      19             : 
      20             : #include <config.h>
      21             : 
      22             : #include "cloexec.h"
      23             : 
      24             : #include <unistd.h>
      25             : #include <fcntl.h>
      26             : 
      27             : #ifndef FD_CLOEXEC
      28             : # define FD_CLOEXEC 1
      29             : #endif
      30             : 
      31             : /* Set the `FD_CLOEXEC' flag of DESC if VALUE is true,
      32             :    or clear the flag if VALUE is false.
      33             :    Return 0 on success, or -1 on error with `errno' set. */
      34             : 
      35             : int
      36           8 : set_cloexec_flag (int desc, bool value)
      37             : {
      38             : #if defined F_GETFD && defined F_SETFD
      39             : 
      40           8 :   int flags = fcntl (desc, F_GETFD, 0);
      41             : 
      42           8 :   if (0 <= flags)
      43             :     {
      44           8 :       int newflags = (value ? flags | FD_CLOEXEC : flags & ~FD_CLOEXEC);
      45             : 
      46           8 :       if (flags == newflags
      47           8 :           || fcntl (desc, F_SETFD, newflags) != -1)
      48           8 :         return 0;
      49             :     }
      50             : 
      51           0 :   return -1;
      52             : 
      53             : #else
      54             : 
      55             :   return 0;
      56             : 
      57             : #endif
      58             : }