136 lines
2.6 KiB
C
136 lines
2.6 KiB
C
/*
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* Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
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* Copyright (C) 2013 John Crispin <blogic@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 2.1
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/watchdog.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <libubox/uloop.h>
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#include "procd.h"
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#include "watchdog.h"
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#define WDT_PATH "/dev/watchdog"
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static struct uloop_timeout wdt_timeout;
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static int wdt_fd = -1;
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static int wdt_frequency = 5;
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void watchdog_ping(void)
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{
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DEBUG(4, "Ping\n");
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if (wdt_fd >= 0 && write(wdt_fd, "X", 1) < 0)
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ERROR("WDT failed to write: %s\n", strerror(errno));
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}
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static void watchdog_timeout_cb(struct uloop_timeout *t)
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{
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watchdog_ping();
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uloop_timeout_set(t, wdt_frequency * 1000);
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}
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void watchdog_set_stopped(bool val)
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{
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if (val)
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uloop_timeout_cancel(&wdt_timeout);
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else
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watchdog_timeout_cb(&wdt_timeout);
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}
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bool watchdog_get_stopped(void)
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{
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return !wdt_timeout.pending;
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}
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int watchdog_timeout(int timeout)
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{
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if (wdt_fd < 0)
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return 0;
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if (timeout) {
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DEBUG(4, "Set watchdog timeout: %ds\n", timeout);
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ioctl(wdt_fd, WDIOC_SETTIMEOUT, &timeout);
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}
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ioctl(wdt_fd, WDIOC_GETTIMEOUT, &timeout);
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return timeout;
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}
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int watchdog_frequency(int frequency)
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{
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if (wdt_fd < 0)
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return 0;
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if (frequency) {
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DEBUG(4, "Set watchdog frequency: %ds\n", frequency);
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wdt_frequency = frequency;
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}
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return wdt_frequency;
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}
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char* watchdog_fd(void)
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{
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static char fd_buf[3];
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if (wdt_fd < 0)
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return NULL;
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snprintf(fd_buf, sizeof(fd_buf), "%d", wdt_fd);
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return fd_buf;
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}
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void watchdog_init(int preinit)
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{
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char *env = getenv("WDTFD");
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if (wdt_fd >= 0)
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return;
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wdt_timeout.cb = watchdog_timeout_cb;
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if (env) {
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DEBUG(2, "Watchdog handover: fd=%s\n", env);
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wdt_fd = atoi(env);
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unsetenv("WDTFD");
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} else {
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wdt_fd = open("/dev/watchdog", O_WRONLY);
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}
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if (wdt_fd < 0)
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return;
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if (!preinit)
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fcntl(wdt_fd, F_SETFD, fcntl(wdt_fd, F_GETFD) | FD_CLOEXEC);
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LOG("- watchdog -\n");
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watchdog_timeout(30);
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watchdog_timeout_cb(&wdt_timeout);
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DEBUG(4, "Opened watchdog with timeout %ds\n", watchdog_timeout(0));
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}
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void watchdog_no_cloexec(void)
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{
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if (wdt_fd < 0)
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return;
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fcntl(wdt_fd, F_SETFD, fcntl(wdt_fd, F_GETFD) & ~FD_CLOEXEC);
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}
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