1/* vi: set sw=4 ts=4: */ 2/* 3 * Mini update implementation for busybox; much pasted from update-2.11 4 * 5 * 6 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. 7 * Copyright (c) 1996, 1997, 1999 Torsten Poulin. 8 * Copyright (c) 2000 by Karl M. Hegbloom <karlheg@debian.org> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 * 24 */ 25 26/* 27 * Note: This program is only necessary if you are running a 2.0.x (or 28 * earlier) kernel. 2.2.x and higher flush filesystem buffers automatically. 29 */ 30 31#include <sys/param.h> 32#include <sys/syslog.h> 33#include <unistd.h> /* for getopt() */ 34#include <stdlib.h> 35 36#if __GNU_LIBRARY__ > 5 37 #include <sys/kdaemon.h> 38#else 39 extern int bdflush (int func, long int data); 40#endif 41 42#include "busybox.h" 43 44static unsigned int sync_duration = 30; 45static unsigned int flush_duration = 5; 46static int use_sync = 0; 47 48extern int update_main(int argc, char **argv) 49{ 50 int pid; 51 int opt; 52 53 while ((opt = getopt(argc, argv, "Ss:f:")) > 0) { 54 switch (opt) { 55 case 'S': 56 use_sync = 1; 57 break; 58 case 's': 59 sync_duration = atoi(optarg); 60 break; 61 case 'f': 62 flush_duration = atoi(optarg); 63 break; 64 default: 65 show_usage(); 66 } 67 } 68 69 if (daemon(0, 1) < 0) 70 perror_msg_and_die("daemon"); 71 72#ifdef OPEN_MAX 73 for (pid = 0; pid < OPEN_MAX; pid++) close(pid); 74#else 75 /* glibc 2.1.92 requires using sysconf(_SC_OPEN_MAX) */ 76 for (pid = 0; pid < sysconf(_SC_OPEN_MAX); pid++) close(pid); 77#endif 78 79 /* This is no longer necessary since 1.3.5x, but it will harmlessly 80 * exit if that is the case. 81 */ 82 83 /* set the program name that will show up in a 'ps' listing */ 84 argv[0] = "bdflush (update)"; 85 argv[1] = NULL; 86 argv[2] = NULL; 87 for (;;) { 88 if (use_sync) { 89 sleep(sync_duration); 90 sync(); 91 } else { 92 sleep(flush_duration); 93 if (bdflush(1, 0) < 0) { 94 openlog("update", LOG_CONS, LOG_DAEMON); 95 syslog(LOG_INFO, 96 "This kernel does not need update(8). Exiting."); 97 closelog(); 98 return EXIT_SUCCESS; 99 } 100 } 101 } 102 103 return EXIT_SUCCESS; 104} 105 106/* 107Local Variables: 108c-file-style: "linux" 109c-basic-offset: 4 110tab-width: 4 111End: 112*/ 113