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25591c322c
which sets same handler for many signals. sig_catch is nuked (bb_signals_recursive is more descriptive name). *: use them as appropriate. function old new delta bb_signals_recursive - 95 +95 bb_signals - 52 +52 run_command 258 273 +15 svlogd_main 1368 1377 +9 runsv_main 1746 1752 +6 runsvdir_main 1643 1646 +3 UNSPEC_print 64 66 +2 time_main 1128 1127 -1 ... resize_main 246 210 -36 sig_catch 63 - -63 set_fatal_sighandler 85 14 -71 ------------------------------------------------------------------------------ (add/remove: 2/1 grow/shrink: 5/24 up/down: 182/-548) Total: -366 bytes
68 lines
1.6 KiB
C
68 lines
1.6 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini watchdog implementation for busybox
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*
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* Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org>
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* Copyright (C) 2006 Bernhard Fischer <busybox@busybox.net>
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include "libbb.h"
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#define OPT_FOREGROUND 0x01
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#define OPT_TIMER 0x02
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static void watchdog_shutdown(int ATTRIBUTE_UNUSED sig) ATTRIBUTE_NORETURN;
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static void watchdog_shutdown(int ATTRIBUTE_UNUSED sig)
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{
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static const char V = 'V';
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write(3, &V, 1); /* Magic, see watchdog-api.txt in kernel */
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if (ENABLE_FEATURE_CLEAN_UP)
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close(3);
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exit(0);
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}
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int watchdog_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int watchdog_main(int argc, char **argv)
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{
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unsigned opts;
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unsigned timer_duration = 30000; /* Userspace timer duration, in milliseconds */
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char *t_arg;
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opt_complementary = "=1"; /* must have 1 argument */
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opts = getopt32(argv, "Ft:", &t_arg);
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if (opts & OPT_TIMER) {
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static const struct suffix_mult suffixes[] = {
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{ "ms", 1 },
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{ "", 1000 },
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{ }
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};
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timer_duration = xatou_sfx(t_arg, suffixes);
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}
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if (!(opts & OPT_FOREGROUND)) {
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bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
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}
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bb_signals(0
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+ (1 << SIGHUP)
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+ (1 << SIGINT)
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, watchdog_shutdown);
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/* Use known fd # - avoid needing global 'int fd' */
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xmove_fd(xopen(argv[argc - 1], O_WRONLY), 3);
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while (1) {
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/*
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* Make sure we clear the counter before sleeping, as the counter value
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* is undefined at this point -- PFM
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*/
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write(3, "", 1); /* write zero byte */
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usleep(timer_duration * 1000L);
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}
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return EXIT_SUCCESS; /* - not reached, but gcc 4.2.1 is too dumb! */
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}
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