78 lines
2 KiB
C
78 lines
2 KiB
C
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/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <linux/watchdog.h>
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#include "log.h"
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#include "util.h"
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#define DEV_NAME "/dev/watchdog"
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int watchdogd_main(int argc, char **argv)
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{
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int fd;
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int ret;
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int interval = 10;
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int margin = 10;
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int timeout;
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open_devnull_stdio();
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klog_init();
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INFO("Starting watchdogd\n");
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if (argc >= 2)
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interval = atoi(argv[1]);
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if (argc >= 3)
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margin = atoi(argv[2]);
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timeout = interval + margin;
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fd = open(DEV_NAME, O_RDWR);
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if (fd < 0) {
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ERROR("watchdogd: Failed to open %s: %s\n", DEV_NAME, strerror(errno));
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return 1;
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}
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ret = ioctl(fd, WDIOC_SETTIMEOUT, &timeout);
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if (ret) {
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ERROR("watchdogd: Failed to set timeout to %d: %s\n", timeout, strerror(errno));
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ret = ioctl(fd, WDIOC_GETTIMEOUT, &timeout);
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if (ret) {
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ERROR("watchdogd: Failed to get timeout: %s\n", strerror(errno));
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} else {
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if (timeout > margin)
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interval = timeout - margin;
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else
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interval = 1;
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ERROR("watchdogd: Adjusted interval to timeout returned by driver: timeout %d, interval %d, margin %d\n",
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timeout, interval, margin);
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}
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}
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while(1) {
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write(fd, "", 1);
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sleep(interval);
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}
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}
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