+/* 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
+ *
+ */
+
#include "internal.h"
#include <linux/unistd.h>
-
-const char update_usage[] = "update\n"
-"\n"
-"\tFlush buffered data to the disk devices every 30 seconds.\n";
+#include <sys/param.h>
+#include <sys/syslog.h>
#if defined(__GLIBC__)
#include <sys/kdaemon.h>
#else
_syscall2(int, bdflush, int, func, int, data);
-#endif /* __GLIBC__ */
+#endif /* __GLIBC__ */
+
+static char update_usage[] =
+ "update [options]\n"
+ " -S\tforce use of sync(2) instead of flushing\n"
+ " -s SECS\tcall sync this often (default 30)\n"
+ " -f SECS\tflush some buffers this often (default 5)\n";
-extern int
-update_main(struct FileInfo * i, int argc, char * * argv)
+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)
{
- /*
- * Update is actually two daemons, bdflush and update.
- */
- int pid;
+ int pid;
+
+ while (**argv == '-') {
+ while (*++(*argv)) {
+ switch (**argv) {
+ case 'S':
+ use_sync = 1;
+ break;
+ case 's':
+ if (--argc < 1) usage(update_usage);
+ sync_duration = atoi(*(++argv));
+ break;
+ case 'f':
+ if (--argc < 1) usage(update_usage);
+ flush_duration = atoi(*(++argv));
+ break;
+ }
+ }
+ argc--;
+ argv++;
+ }
pid = fork();
- if ( pid < 0 )
- return pid;
- else if ( pid == 0 ) {
+ if (pid < 0)
+ exit(FALSE);
+ else if (pid == 0) {
+ /* Become a proper daemon */
+ setsid();
+ chdir("/");
+ for (pid = 0; pid < OPEN_MAX; pid++) close(pid);
+
/*
* This is no longer necessary since 1.3.5x, but it will harmlessly
* exit if that is the case.
*/
- strcpy(argv[0], "bdflush (update)");
- argv[1] = 0;
- argv[2] = 0;
- bdflush(1, 0);
- _exit(0);
- }
- pid = fork();
- if ( pid < 0 )
- return pid;
- else if ( pid == 0 ) {
- argv[0] = "update";
- for ( ; ; ) {
- sync();
- sleep(30);
+ 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 0;
+ return TRUE;
}
+
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/