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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* Derived from:
* $FreeBSD: src/lib/libc/gen/daemon.c,v 1.8 2007/01/09 00:27:53 imp Exp $
*/
//lint -e{766}
#include "config.h"
#include <fcntl.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include "compat/daemon.h"
#include "vdef.h"
#include "vas.h"
/*
* Copied from libvarnish/vfil.c to avoid pulling libvarnish or vfil.c
* directly when daemon() is not working/available (i.e. OSX).
*
*/
static void
vfil_null_fd(int target)
{
int fd;
assert(target >= 0);
fd = open("/dev/null", O_RDWR);
assert(fd >= 0);
assert(dup2(fd, target) == target);
closefd(&fd);
}
int
varnish_daemon(int nochdir, int noclose)
{
struct sigaction osa, sa;
pid_t newgrp;
int oerrno;
int osa_ok;
/* A SIGHUP may be thrown when the parent exits below. */
AZ(sigemptyset(&sa.sa_mask));
sa.sa_handler = SIG_IGN;
sa.sa_flags = 0;
osa_ok = sigaction(SIGHUP, &sa, &osa);
switch (fork()) {
case -1:
return (-1);
case 0:
break;
default:
/*
* A fine point: _exit(0), not exit(0), to avoid triggering
* atexit(3) processing
*/
_exit(0);
}
newgrp = setsid();
oerrno = errno;
if (osa_ok != -1)
AZ(sigaction(SIGHUP, &osa, NULL));
if (newgrp == -1) {
errno = oerrno;
return (-1);
}
if (!nochdir)
(void)chdir("/");
if (!noclose) {
vfil_null_fd(STDIN_FILENO);
vfil_null_fd(STDOUT_FILENO);
vfil_null_fd(STDERR_FILENO);
}
return (0);
}
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