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- /*
- * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
- * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Lesser General Public License version 2.1
- * as published by the Free Software Foundation
- *
- * 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.
- */
- #include <linux/watchdog.h>
- #include <sys/ioctl.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <fcntl.h>
- #include <unistd.h>
- #include <libubox/uloop.h>
- #include "procd.h"
- #include "watchdog.h"
- #define WDT_PATH "/dev/watchdog"
- static struct uloop_timeout wdt_timeout;
- static int wdt_fd = -1;
- static int wdt_frequency = 5;
- static void watchdog_timeout_cb(struct uloop_timeout *t)
- {
- DEBUG(2, "Ping\n");
- if (write(wdt_fd, "X", 1) < 0)
- ERROR("WDT failed to write: %s\n", strerror(errno));
- uloop_timeout_set(t, wdt_frequency * 1000);
- }
- void watchdog_set_stopped(bool val)
- {
- if (val)
- uloop_timeout_cancel(&wdt_timeout);
- else
- watchdog_timeout_cb(&wdt_timeout);
- }
- bool watchdog_get_stopped(void)
- {
- return !wdt_timeout.pending;
- }
- int watchdog_timeout(int timeout)
- {
- if (wdt_fd < 0)
- return 0;
- if (timeout) {
- DEBUG(2, "Set watchdog timeout: %ds\n", timeout);
- ioctl(wdt_fd, WDIOC_SETTIMEOUT, &timeout);
- }
- ioctl(wdt_fd, WDIOC_GETTIMEOUT, &timeout);
- return timeout;
- }
- int watchdog_frequency(int frequency)
- {
- if (wdt_fd < 0)
- return 0;
- if (frequency) {
- DEBUG(2, "Set watchdog frequency: %ds\n", frequency);
- wdt_frequency = frequency;
- }
- return wdt_frequency;
- }
- char* watchdog_fd(void)
- {
- static char fd_buf[3];
- if (wdt_fd < 0)
- return NULL;
- snprintf(fd_buf, sizeof(fd_buf), "%d", wdt_fd);
- return fd_buf;
- }
- void watchdog_init(int preinit)
- {
- char *env = getenv("WDTFD");
- if (wdt_fd >= 0)
- return;
- wdt_timeout.cb = watchdog_timeout_cb;
- if (env) {
- DEBUG(1, "Watchdog handover: fd=%s\n", env);
- wdt_fd = atoi(env);
- unsetenv("WDTFD");
- } else {
- wdt_fd = open("/dev/watchdog", O_WRONLY);
- }
- if (wdt_fd < 0)
- return;
- if (!preinit)
- fcntl(wdt_fd, F_SETFD, fcntl(wdt_fd, F_GETFD) | FD_CLOEXEC);
- LOG("- watchdog -\n");
- watchdog_timeout(30);
- watchdog_timeout_cb(&wdt_timeout);
- DEBUG(2, "Opened watchdog with timeout %ds\n", watchdog_timeout(0));
- }
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