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-rw-r--r--lib/cloexec.c60
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diff --git a/lib/cloexec.c b/lib/cloexec.c
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1/* closexec.c - set or clear the close-on-exec descriptor flag
2 Copyright (C) 1991, 2004, 2005 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
7 any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17
18 The code is taken from glibc/manual/llio.texi */
19
20#ifdef HAVE_CONFIG_H
21# include <config.h>
22#endif
23
24#include "cloexec.h"
25
26#include <unistd.h>
27#include <fcntl.h>
28
29#ifndef FD_CLOEXEC
30# define FD_CLOEXEC 1
31#endif
32
33/* Set the `FD_CLOEXEC' flag of DESC if VALUE is true,
34 or clear the flag if VALUE is false.
35 Return 0 on success, or -1 on error with `errno' set. */
36
37int
38set_cloexec_flag (int desc, bool value)
39{
40#if defined F_GETFD && defined F_SETFD
41
42 int flags = fcntl (desc, F_GETFD, 0);
43
44 if (0 <= flags)
45 {
46 int newflags = (value ? flags | FD_CLOEXEC : flags & ~FD_CLOEXEC);
47
48 if (flags == newflags
49 || fcntl (desc, F_SETFD, newflags) != -1)
50 return 0;
51 }
52
53 return -1;
54
55#else
56
57 return 0;
58
59#endif
60}