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-rw-r--r--lib/cloexec.c63
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1/* closexec.c - set or clear the close-on-exec descriptor flag
2 Copyright (C) 1991, 2004 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17
18 The code is taken from glibc/manual/llio.texi */
19
20#if HAVE_CONFIG_H
21# include <config.h>
22#endif
23
24#include "cloexec.h"
25
26#if HAVE_UNISTD_H
27# include <unistd.h>
28#endif
29
30#if HAVE_FCNTL_H
31# include <fcntl.h>
32#endif
33
34#ifndef FD_CLOEXEC
35# define FD_CLOEXEC 1
36#endif
37
38/* Set the `FD_CLOEXEC' flag of DESC if VALUE is true,
39 or clear the flag if VALUE is false.
40 Return true on success, or false on error with `errno' set. */
41
42bool
43set_cloexec_flag (int desc, bool value)
44{
45#if defined F_GETFD && defined F_SETFD
46
47 int flags = fcntl (desc, F_GETFD, 0);
48 int newflags;
49
50 if (flags < 0)
51 return false;
52
53 newflags = (value ? flags | FD_CLOEXEC : flags & ~FD_CLOEXEC);
54
55 return (flags == newflags
56 || fcntl (desc, F_SETFD, newflags) != -1);
57
58#else
59
60 return true;
61
62#endif
63}