fab0410101
killing self, instead of the other way around. Fixes a bug where the child process would use 100% CPU spinning while it waited for its parent to arm a non-existent watchdog timer. Now, the child process gets killed, as was intended.
444 lines
10 KiB
C
444 lines
10 KiB
C
/* $NetBSD: wdogctl.c,v 1.15 2005/08/31 18:28:58 dyoung Exp $ */
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/*-
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* Copyright (c) 2000 Zembu Labs, Inc.
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* All rights reserved.
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*
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* Author: Jason R. Thorpe <thorpej@zembu.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Zembu Labs, Inc.
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* 4. Neither the name of Zembu Labs nor the names of its employees may
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* be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY ZEMBU LABS, INC. ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WAR-
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* RANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS-
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* CLAIMED. IN NO EVENT SHALL ZEMBU LABS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: wdogctl.c,v 1.15 2005/08/31 18:28:58 dyoung Exp $");
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#endif
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/wdog.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <signal.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <string.h>
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#define _PATH_WATCHDOG "/dev/watchdog"
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int main(int, char *[]);
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void enable_kernel(const char *, u_int);
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void enable_user(const char *, u_int);
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void enable_ext(const char *, u_int);
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void tickle_ext(void);
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void disable(void);
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void prep_wmode(struct wdog_mode *, int, const char *, u_int);
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void list_timers(void);
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void usage(void);
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int Aflag;
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/* Caution -- ordered list; entries >= CMD_EXT_TICKLE set timers */
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enum cmd {
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CMD_NONE, /* No verb given */
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CMD_DISABLE,
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CMD_DOTICKLE,
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CMD_EXT_TICKLE,
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CMD_KERN_TICKLE,
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CMD_USER_TICKLE
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};
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int
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main(int argc, char *argv[])
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{
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enum cmd command = CMD_NONE;
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int period_flag = 0;
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int ch;
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u_int period = WDOG_PERIOD_DEFAULT;
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while ((ch = getopt(argc, argv, "Adekp:ut")) != -1) {
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switch (ch) {
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case 'A':
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Aflag = 1;
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break;
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case 'd':
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if (command != CMD_NONE)
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usage();
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command = CMD_DISABLE;
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break;
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case 'e':
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if (command != CMD_NONE)
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usage();
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command = CMD_EXT_TICKLE;
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break;
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case 'k':
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if (command != CMD_NONE)
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usage();
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command = CMD_KERN_TICKLE;
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break;
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case 't':
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if (command != CMD_NONE)
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usage();
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command = CMD_DOTICKLE;
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break;
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case 'p':
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period_flag = 1;
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period = atoi(optarg);
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if (period == -1)
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usage();
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break;
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case 'u':
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if (command != CMD_NONE)
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usage();
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command = CMD_USER_TICKLE;
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (command < CMD_EXT_TICKLE) {
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if (Aflag || period_flag)
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usage();
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if (argc != 0)
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usage();
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} else if (argc != 1)
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usage();
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switch (command) {
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case CMD_NONE:
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list_timers();
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break;
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case CMD_DISABLE:
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disable();
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break;
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case CMD_DOTICKLE:
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tickle_ext();
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break;
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case CMD_EXT_TICKLE:
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enable_ext(argv[0], period);
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break;
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case CMD_KERN_TICKLE:
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enable_kernel(argv[0], period);
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break;
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case CMD_USER_TICKLE:
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enable_user(argv[0], period);
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break;
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}
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exit(EXIT_SUCCESS);
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}
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void
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prep_wmode(struct wdog_mode *wp, int mode, const char *name, u_int period)
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{
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if (strlen(name) >= WDOG_NAMESIZE)
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errx(EXIT_FAILURE, "invalid watchdog timer name: %s", name);
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strlcpy(wp->wm_name, name, sizeof(wp->wm_name));
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wp->wm_mode = mode;
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wp->wm_period = period;
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if (Aflag)
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wp->wm_mode |= WDOG_FEATURE_ALARM;
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}
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void
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enable_kernel(const char *name, u_int period)
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{
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struct wdog_mode wm;
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int fd;
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prep_wmode(&wm, WDOG_MODE_KTICKLE, name, period);
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fd = open(_PATH_WATCHDOG, O_RDWR, 0644);
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if (fd == -1)
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err(EXIT_FAILURE, "open %s", _PATH_WATCHDOG);
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if (ioctl(fd, WDOGIOC_SMODE, &wm) == -1)
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err(EXIT_FAILURE, "WDOGIOC_SMODE");
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}
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void
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enable_ext(const char *name, u_int period)
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{
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struct wdog_mode wm;
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int fd;
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prep_wmode(&wm, WDOG_MODE_ETICKLE, name, period);
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fd = open(_PATH_WATCHDOG, O_RDWR, 0644);
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if (fd == -1)
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err(EXIT_FAILURE, "open %s", _PATH_WATCHDOG);
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if (ioctl(fd, WDOGIOC_SMODE, &wm) == -1) {
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err(EXIT_FAILURE, "WDOGIOC_SMODE");
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}
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if (ioctl(fd, WDOGIOC_TICKLE) == -1)
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syslog(LOG_EMERG, "unable to tickle watchdog timer %s: %m",
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wm.wm_name);
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return;
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}
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void
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enable_user(const char *name, u_int period)
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{
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struct wdog_mode wm;
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struct timespec ts;
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pid_t tickler;
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int fd, rv;
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prep_wmode(&wm, WDOG_MODE_UTICKLE, name, period);
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fd = open(_PATH_WATCHDOG, O_RDWR, 0644);
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if (fd == -1)
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err(EXIT_FAILURE, "open %s", _PATH_WATCHDOG);
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/* ...so we can log failures to tickle the timer. */
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openlog("wdogctl", LOG_PERROR|LOG_PID, LOG_DAEMON);
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/*
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* We fork a child process which detaches from the controlling
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* terminal once the timer is armed, and tickles the timer
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* until we send it a SIGTERM.
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*/
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tickler = fork();
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if (tickler == -1)
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err(EXIT_FAILURE, "unable to fork tickler process");
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else if (tickler != 0) {
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if (ioctl(fd, WDOGIOC_SMODE, &wm) == -1) {
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(void)kill(tickler, SIGTERM);
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err(EXIT_FAILURE, "WDOGIOC_SMODE");
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}
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(void)close(fd);
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return;
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}
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/*
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* Wait for the watchdog to be armed. When it is, loop,
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* tickling the timer, then waiting 1/2 the period before
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* doing it again.
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*
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* If the parent fails to enable the watchdog, it will kill
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* us.
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*/
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do {
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rv = ioctl(fd, WDOGIOC_WHICH, &wm);
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} while (rv == -1);
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if (ioctl(fd, WDOGIOC_TICKLE) == -1)
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syslog(LOG_EMERG, "unable to tickle watchdog timer %s: %m",
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wm.wm_name);
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/*
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* Now detach from the controlling terminal, and just run
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* in the background. The kernel will keep track of who
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* we are, each time we tickle the timer.
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*/
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if (daemon(0, 0) == -1) {
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/*
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* We weren't able to go into the background. When
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* we exit, the kernel will disable the watchdog so
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* that the system won't die.
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*/
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err(EXIT_FAILURE, "unable to detach from terminal");
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}
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if (ioctl(fd, WDOGIOC_TICKLE) == -1)
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syslog(LOG_EMERG, "unable to tickle watchdog timer %s: %m",
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wm.wm_name);
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for (;;) {
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ts.tv_sec = wm.wm_period / 2;
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ts.tv_nsec = 0;
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(void)nanosleep(&ts, NULL);
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if (ioctl(fd, WDOGIOC_TICKLE) == -1)
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syslog(LOG_EMERG,
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"unable to tickle watchdog timer %s: %m",
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wm.wm_name);
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}
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/* NOTREACHED */
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}
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void
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tickle_ext()
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{
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int fd;
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fd = open(_PATH_WATCHDOG, O_RDWR, 0644);
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if (fd == -1)
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err(EXIT_FAILURE, "open %s", _PATH_WATCHDOG);
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if (ioctl(fd, WDOGIOC_TICKLE) == -1)
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fprintf(stderr, "Cannot tickle timer\n");
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}
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void
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disable(void)
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{
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struct wdog_mode wm;
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pid_t tickler;
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int fd, mode;
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fd = open(_PATH_WATCHDOG, O_RDWR, 0644);
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if (fd == -1)
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err(EXIT_FAILURE, "open %s", _PATH_WATCHDOG);
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if (ioctl(fd, WDOGIOC_WHICH, &wm) == -1) {
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printf("No watchdog timer running.\n");
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return;
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}
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mode = wm.wm_mode & WDOG_MODE_MASK;
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/*
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* If the timer is running in UTICKLE mode, we need
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* to kill the wdogctl(8) process that is tickling
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* the timer.
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*/
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if (mode == WDOG_MODE_UTICKLE) {
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if (ioctl(fd, WDOGIOC_GTICKLER, &tickler) == -1)
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err(EXIT_FAILURE, "WDOGIOC_GTICKLER");
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(void)close(fd);
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(void)kill(tickler, SIGTERM);
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} else {
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wm.wm_mode = WDOG_MODE_DISARMED;
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if (ioctl(fd, WDOGIOC_SMODE, &wm) == -1) {
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err(EXIT_FAILURE, "unable to disarm watchdog %s",
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wm.wm_name);
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}
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(void)close(fd);
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}
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}
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void
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list_timers(void)
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{
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struct wdog_conf wc;
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struct wdog_mode wm;
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char *buf, *cp;
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int fd, count, i, mode;
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pid_t tickler;
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fd = open(_PATH_WATCHDOG, O_RDONLY, 0644);
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if (fd == -1)
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err(EXIT_FAILURE, "open %s", _PATH_WATCHDOG);
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wc.wc_names = NULL;
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wc.wc_count = 0;
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if (ioctl(fd, WDOGIOC_GWDOGS, &wc) == -1)
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err(EXIT_FAILURE, "ioctl WDOGIOC_GWDOGS for count");
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count = wc.wc_count;
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if (count == 0) {
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printf("No watchdog timers present.\n");
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goto out;
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}
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buf = malloc(count * WDOG_NAMESIZE);
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if (buf == NULL)
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err(EXIT_FAILURE, "malloc %d byte for watchdog names",
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count * WDOG_NAMESIZE);
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wc.wc_names = buf;
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if (ioctl(fd, WDOGIOC_GWDOGS, &wc) == -1)
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err(EXIT_FAILURE, "ioctl WDOGIOC_GWDOGS for names");
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count = wc.wc_count;
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if (count == 0) {
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printf("No watchdog timers present.\n");
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free(buf);
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goto out;
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}
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printf("Available watchdog timers:\n");
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for (i = 0, cp = buf; i < count; i++, cp += WDOG_NAMESIZE) {
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cp[WDOG_NAMESIZE - 1] = '\0';
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strlcpy(wm.wm_name, cp, sizeof(wm.wm_name));
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if (ioctl(fd, WDOGIOC_GMODE, &wm) == -1)
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continue;
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mode = wm.wm_mode & WDOG_MODE_MASK;
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if (mode == WDOG_MODE_UTICKLE) {
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if (ioctl(fd, WDOGIOC_GTICKLER, &tickler) == -1)
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tickler = (pid_t) -1;
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}
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printf("\t%s, %u second period", cp, wm.wm_period);
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if (mode != WDOG_MODE_DISARMED) {
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switch(mode) {
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case WDOG_MODE_KTICKLE:
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printf(" [armed, kernel tickle");
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break;
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case WDOG_MODE_UTICKLE:
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printf(" [armed, user tickle");
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if (tickler != (pid_t) -1)
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printf(", pid %d", tickler);
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break;
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case WDOG_MODE_ETICKLE:
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printf(" [armed, external tickle");
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break;
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}
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printf("]");
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}
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printf("\n");
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}
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out:
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(void)close(fd);
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}
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void
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usage(void)
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{
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fprintf(stderr, "usage: %s\n", getprogname());
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fprintf(stderr, " %s -d\n", getprogname());
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fprintf(stderr, " %s -e [-A] [-p seconds] timer\n",
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getprogname());
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fprintf(stderr, " %s -k [-A] [-p seconds] timer\n",
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getprogname());
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fprintf(stderr, " %s -t\n", getprogname());
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fprintf(stderr, " %s -u [-A] [-p seconds] timer\n",
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getprogname());
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exit(1);
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}
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