1/***
2  This file is part of libdaemon.
3
4  Copyright 2003-2008 Lennart Poettering
5
6  libdaemon is free software; you can redistribute it and/or modify
7  it under the terms of the GNU Lesser General Public License as
8  published by the Free Software Foundation, either version 2.1 of the
9  License, or (at your option) any later version.
10
11  libdaemon is distributed in the hope that it will be useful, but
12  WITHOUT ANY WARRANTY; without even the implied warranty of
13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  Lesser General Public License for more details.
15
16  You should have received a copy of the GNU Lesser General Public
17  License along with libdaemon. If not, see
18  <http://www.gnu.org/licenses/>.
19***/
20
21#ifdef HAVE_CONFIG_H
22#include <config.h>
23#endif
24
25#include <fcntl.h>
26
27#include "dnonblock.h"
28
29int daemon_nonblock(int fd, int b) {
30    int a, c;
31
32    if ((a = fcntl(fd, F_GETFL)) < 0)
33        return -1;
34
35    if (b)
36        c = a | O_NONBLOCK;
37    else
38        c = a & ~O_NONBLOCK;
39
40    if (c == a)
41        return 0;
42
43    return fcntl(fd, F_SETFL, c);
44}
45