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119 lines
2.8 KiB
C
119 lines
2.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini update implementation for busybox; much pasted from update-2.11
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*
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*
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* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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* Copyright (c) 1996, 1997, 1999 Torsten Poulin.
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* Copyright (c) 2000 by Karl M. Hegbloom <karlheg@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "internal.h"
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#include <linux/unistd.h>
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#include <sys/param.h>
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#include <sys/syslog.h>
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#if defined(__GLIBC__)
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#include <sys/kdaemon.h>
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#else
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_syscall2(int, bdflush, int, func, int, data);
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#endif /* __GLIBC__ */
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static char update_usage[] =
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"update [options]\n\n"
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"Periodically flushes filesystem buffers.\n\n"
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"Options:\n"
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"\t-S\tforce use of sync(2) instead of flushing\n"
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"\t-s SECS\tcall sync this often (default 30)\n"
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"\t-f SECS\tflush some buffers this often (default 5)\n";
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static unsigned int sync_duration = 30;
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static unsigned int flush_duration = 5;
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static int use_sync = 0;
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extern int update_main(int argc, char **argv)
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{
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int pid;
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argc--;
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argv++;
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while (argc>0 && **argv == '-') {
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while (*++(*argv)) {
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switch (**argv) {
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case 'S':
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use_sync = 1;
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break;
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case 's':
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if (--argc < 1) usage(update_usage);
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sync_duration = atoi(*(++argv));
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break;
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case 'f':
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if (--argc < 1) usage(update_usage);
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flush_duration = atoi(*(++argv));
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break;
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default:
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usage(update_usage);
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}
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}
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argc--;
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argv++;
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}
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pid = fork();
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if (pid < 0)
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exit(FALSE);
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else if (pid == 0) {
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/* Become a proper daemon */
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setsid();
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chdir("/");
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for (pid = 0; pid < OPEN_MAX; pid++) close(pid);
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/*
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* This is no longer necessary since 1.3.5x, but it will harmlessly
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* exit if that is the case.
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*/
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argv[0] = "bdflush (update)";
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argv[1] = NULL;
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argv[2] = NULL;
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for (;;) {
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if (use_sync) {
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sleep(sync_duration);
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sync();
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} else {
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sleep(flush_duration);
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if (bdflush(1, 0) < 0) {
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openlog("update", LOG_CONS, LOG_DAEMON);
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syslog(LOG_INFO,
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"This kernel does not need update(8). Exiting.");
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closelog();
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exit(TRUE);
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}
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}
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}
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}
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exit( TRUE);
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}
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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