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/* closexec.c - set or clear the close-on-exec descriptor flag
Copyright (C) 1991, 2004 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
The code is taken from glibc/manual/llio.texi */
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include "cloexec.h"
#if HAVE_UNISTD_H
# include <unistd.h>
#endif
#if HAVE_FCNTL_H
# include <fcntl.h>
#endif
#ifndef FD_CLOEXEC
# define FD_CLOEXEC 1
#endif
/* Set the `FD_CLOEXEC' flag of DESC if VALUE is true,
or clear the flag if VALUE is false.
Return true on success, or false on error with `errno' set. */
bool
set_cloexec_flag (int desc, bool value)
{
#if defined F_GETFD && defined F_SETFD
int flags = fcntl (desc, F_GETFD, 0);
int newflags;
if (flags < 0)
return false;
newflags = (value ? flags | FD_CLOEXEC : flags & ~FD_CLOEXEC);
return (flags == newflags
|| fcntl (desc, F_SETFD, newflags) != -1);
#else
return true;
#endif
}
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