* Copyright 2007, Haiku, Inc. All Rights Reserved.
* Distributed under the terms of the MIT License.
*
* Authors:
* Axel Dörfler, axeld@pinc-software.de
*/
#include <fcntl.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
static void
restore_old_sighup(int result, struct sigaction *action)
{
if (result != -1)
sigaction(SIGHUP, action, NULL);
}
int
daemon(int noChangeDir, int noClose)
{
struct sigaction oldAction, action;
int oldActionResult;
pid_t newGroup;
pid_t pid;
sigemptyset(&action.sa_mask);
action.sa_handler = SIG_IGN;
action.sa_flags = 0;
oldActionResult = sigaction(SIGHUP, &action, &oldAction);
pid = fork();
if (pid == -1) {
restore_old_sighup(oldActionResult, &oldAction);
return -1;
}
if (pid > 0) {
exit(0);
}
newGroup = setsid();
restore_old_sighup(oldActionResult, &oldAction);
if (newGroup == -1)
return -1;
if (!noChangeDir)
chdir("/");
if (!noClose) {
int fd = open("/dev/null", O_RDWR);
if (fd != -1) {
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
if (fd > STDERR_FILENO)
close(fd);
}
}
return 0;
}
