/***************************************************************************
 *   Copyright (C) 03/2005 by Olaf Rempel                                  *
 *   razzor@kopf-tisch.de                                                  *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <pwd.h>

#include "hlswmaster.h"

/**
 * daemonize()
 * macht den Prozess zu einen Daemon
 * und fuehrt ihn unterem user aus
 *
 * @param char *pw_name
 *
 * TODO: hier schon logging benutzen? stderr? wann exit/return?
 */
void daemonize(char *pw_name) {
	int     fail = 0;
	pid_t   pid;
	struct  passwd *pwl;

	if ((pid = fork()) < 0) {
		log_print("daemonize(): fork()");
		exit(-1);

	} else if (pid != 0) {
		/* Elternprozess beenden */
		exit(0);

	} else {
		/* Kindprozess weiterlaufen lassen */
		if (setsid() == -1) {
			log_print("daemonize: setsid()");
			exit(-1);
		}

		umask(0) ;

		if (pw_name != NULL) {
			if((pwl = getpwnam(pw_name)) == NULL) {
				log_print("mkdaemon(): getpwnam(\"%s\")", pw_name);
				exit(-1);
			}

			if (setgid(pwl->pw_gid) != 0) {
				log_print("mkdaemon(): setgid()");
				fail = 1;
			}

			if (setuid(pwl->pw_uid) != 0) {
				log_print("mkdaemon(): setuid()");
				fail = 1;
			}

			if (fail == 0) {
				log_print("user changed to: %s, pid: %d", pw_name, getpid());
			}
		}
	}
}