23dfcd7408
This gets rid of homegrown hacks and puts all probes in one place. Tested for NetBSD (build.sh + anita) and Linux (buildrump.sh)
148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
/* $NetBSD: rumpuser_daemonize.c,v 1.7 2014/11/04 19:05:17 pooka Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2010 Antti Kantee. 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
|
|
*/
|
|
|
|
#include "rumpuser_port.h"
|
|
|
|
#if !defined(lint)
|
|
__RCSID("$NetBSD: rumpuser_daemonize.c,v 1.7 2014/11/04 19:05:17 pooka Exp $");
|
|
#endif /* !lint */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
|
|
#include "rumpuser_int.h"
|
|
|
|
#if defined(HAVE_PATHS_H)
|
|
#include <paths.h>
|
|
#else
|
|
#define _PATH_DEVNULL "/dev/null"
|
|
#endif
|
|
|
|
static int isdaemonizing;
|
|
static int daemonpipe[2];
|
|
|
|
#include <rump/rumpuser.h>
|
|
|
|
int
|
|
rumpuser_daemonize_begin(void)
|
|
{
|
|
ssize_t n;
|
|
int error;
|
|
int rv;
|
|
|
|
if (isdaemonizing) {
|
|
rv = EINPROGRESS;
|
|
goto out;
|
|
}
|
|
isdaemonizing = 1;
|
|
|
|
/*
|
|
* For daemons we need to fork. However, since we can't fork
|
|
* after rump_init (which creates threads), do it now. Add
|
|
* a little pipe trickery to make sure we don't exit until the
|
|
* service is fully inited (i.e. interlocked daemonization).
|
|
* Actually, use sucketpair since that allows to easily steer
|
|
* clear of the dreaded sigpipe.
|
|
*
|
|
* Note: We do *NOT* host chdir("/"). It's up to the caller to
|
|
* take care of that or not.
|
|
*/
|
|
if (socketpair(PF_LOCAL, SOCK_STREAM, 0, daemonpipe) == -1) {
|
|
rv = errno;
|
|
goto out;
|
|
}
|
|
|
|
switch (fork()) {
|
|
case 0:
|
|
if (setsid() == -1) {
|
|
rumpuser_daemonize_done(errno);
|
|
}
|
|
rv = 0;
|
|
break;
|
|
case -1:
|
|
rv = errno;
|
|
break;
|
|
default:
|
|
close(daemonpipe[1]);
|
|
n = recv(daemonpipe[0], &error, sizeof(error), MSG_NOSIGNAL);
|
|
if (n == -1)
|
|
error = errno;
|
|
else if (n != sizeof(error))
|
|
error = ESRCH;
|
|
_exit(error);
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
out:
|
|
ET(rv);
|
|
}
|
|
|
|
int
|
|
rumpuser_daemonize_done(int error)
|
|
{
|
|
ssize_t n;
|
|
int fd, rv = 0;
|
|
|
|
if (!isdaemonizing) {
|
|
rv = ENOENT;
|
|
goto outout;
|
|
}
|
|
|
|
if (error == 0) {
|
|
fd = open(_PATH_DEVNULL, O_RDWR);
|
|
if (fd == -1) {
|
|
error = errno;
|
|
goto out;
|
|
}
|
|
dup2(fd, STDIN_FILENO);
|
|
dup2(fd, STDOUT_FILENO);
|
|
dup2(fd, STDERR_FILENO);
|
|
if (fd > STDERR_FILENO)
|
|
close(fd);
|
|
}
|
|
|
|
out:
|
|
n = send(daemonpipe[1], &error, sizeof(error), MSG_NOSIGNAL);
|
|
if (n != sizeof(error)) {
|
|
rv = EPIPE;
|
|
} else if (n == -1) {
|
|
rv = errno;
|
|
} else {
|
|
close(daemonpipe[0]);
|
|
close(daemonpipe[1]);
|
|
}
|
|
|
|
outout:
|
|
ET(rv);
|
|
}
|