| /* 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 "busybox.h" |
| #include <sys/param.h> |
| #include <sys/syslog.h> |
| #include <unistd.h> /* for getopt() */ |
| |
| |
| #if defined(__GLIBC__) |
| #include <sys/kdaemon.h> |
| #else |
| static _syscall2(int, bdflush, int, func, int, data); |
| #endif /* __GLIBC__ */ |
| |
| 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: |
| usage(update_usage); |
| } |
| } |
| |
| pid = fork(); |
| if (pid < 0) |
| exit(FALSE); |
| else if (pid == 0) { |
| /* Become a proper daemon */ |
| setsid(); |
| chdir("/"); |
| #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(); |
| exit(TRUE); |
| } |
| } |
| } |
| } |
| return( TRUE); |
| } |
| |
| /* |
| Local Variables: |
| c-file-style: "linux" |
| c-basic-offset: 4 |
| tab-width: 4 |
| End: |
| */ |