diff options
Diffstat (limited to 'update.c')
| -rw-r--r-- | update.c | 86 |
1 files changed, 66 insertions, 20 deletions
@@ -1,9 +1,11 @@ /* vi: set sw=4 ts=4: */ /* - * Mini update implementation for busybox + * 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 @@ -23,6 +25,8 @@ #include "internal.h" #include <linux/unistd.h> +#include <sys/param.h> +#include <sys/syslog.h> #if defined(__GLIBC__) #include <sys/kdaemon.h> @@ -30,37 +34,79 @@ _syscall2(int, bdflush, int, func, int, data); #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"; + +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; + 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; + 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"; + argv[0] = "bdflush (update)"; + argv[1] = NULL; + argv[2] = NULL; for (;;) { - sync(); - sleep(30); + 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: +*/ |