2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)daemon.c 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: src/lib/libc/gen/daemon.c,v 1.8 2007/01/09 00:27:53 imp Exp $
31 * $DragonFly: src/lib/libc/gen/daemon.c,v 1.4 2005/04/26 15:57:39 joerg Exp $
34 #include "namespace.h"
41 #include "un-namespace.h"
44 daemon(int nochdir
, int noclose
)
46 struct sigaction osa
, sa
;
52 /* A SIGHUP may be thrown when the parent exits below. */
53 sigemptyset(&sa
.sa_mask
);
54 sa
.sa_handler
= SIG_IGN
;
56 osa_ok
= _sigaction(SIGHUP
, &sa
, &osa
);
70 _sigaction(SIGHUP
, &osa
, NULL
);
80 if (!noclose
&& (fd
= _open(_PATH_DEVNULL
, O_RDWR
, 0)) != -1) {
81 _dup2(fd
, STDIN_FILENO
);
82 _dup2(fd
, STDOUT_FILENO
);
83 _dup2(fd
, STDERR_FILENO
);