/* vi: set sw=4 ts=4: *//* * Mini update implementation for busybox; much pasted from update-2.11 * * * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. * Copyright (c) 1996, 1997, 1999 Torsten Poulin. * Copyright (c) 2000 by Karl M. Hegbloom <karlheg@debian.org> * * 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 * *//* * Note: This program is only necessary if you are running a 2.0.x (or * earlier) kernel. 2.2.x and higher flush filesystem buffers automatically. */#include <sys/param.h>#include <sys/syslog.h>#include <unistd.h> /* for getopt() */#include <stdlib.h>#if __GNU_LIBRARY__ > 5	#include <sys/kdaemon.h>#else	extern int bdflush (int func, long int data);#endif#include "busybox.h"static unsigned int sync_duration = 30;static unsigned int flush_duration = 5;static int use_sync = 0;extern int update_main(int argc, char **argv){	int pid;	int opt;	while ((opt = getopt(argc, argv, "Ss:f:")) > 0) {		switch (opt) {			case 'S':				use_sync = 1;				break;			case 's':				sync_duration = atoi(optarg);				break;			case 'f':				flush_duration = atoi(optarg);				break;			default:				show_usage();		}	}		if (daemon(0, 1) < 0)		perror_msg_and_die("daemon");#ifdef OPEN_MAX	for (pid = 0; pid < OPEN_MAX; pid++) close(pid);#else	/* glibc 2.1.92 requires using sysconf(_SC_OPEN_MAX) */	for (pid = 0; pid < sysconf(_SC_OPEN_MAX); pid++) close(pid);#endif	/* This is no longer necessary since 1.3.5x, but it will harmlessly	 * exit if that is the case.	 */	/* set the program name that will show up in a 'ps' listing */	argv[0] = "bdflush (update)";	argv[1] = NULL;	argv[2] = NULL;	for (;;) {		if (use_sync) {			sleep(sync_duration);			sync();		} else {			sleep(flush_duration);			if (bdflush(1, 0) < 0) {				openlog("update", LOG_CONS, LOG_DAEMON);				syslog(LOG_INFO,						"This kernel does not need update(8). Exiting.");				closelog();				return EXIT_SUCCESS;			}		}	}	return EXIT_SUCCESS;}/*Local Variables:c-file-style: "linux"c-basic-offset: 4tab-width: 4End:*/