/*
 * Copyright (c) 2007 Albert Lee <trisk@acm.jhu.edu>.
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

int daemon(int nochdir, int noclose);

int daemon(int nochdir, int noclose)
{
	int fd, i;

	switch (fork()) {
		case 0:
			break;
		case -1:
			return -1;
		default:
			_exit(0);
	}

	if (!nochdir) {
		chdir("/");
	}

	if (setsid() < 0) {
		return -1;
	}
	
	if (!noclose) {
		if ((fd = open("/dev/null", O_RDWR) >= 0)) {
			for (i = 0; i < 3; i++) {
				dup2(fd, i);
			}
			if (fd > 2) {
				close(fd);
			}
		}
	}

	return 0;
}