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81 lines
2.2 KiB
81 lines
2.2 KiB
/* |
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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 <linux/watchdog.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include <android-base/logging.h> |
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#include "log.h" |
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#ifdef _INIT_INIT_H |
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#error "Do not include init.h in files used by ueventd or watchdogd; it will expose init's globals" |
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#endif |
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#define DEV_NAME "/dev/watchdog" |
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namespace android { |
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namespace init { |
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int watchdogd_main(int argc, char **argv) { |
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InitKernelLogging(argv); |
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int interval = 10; |
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if (argc >= 2) interval = atoi(argv[1]); |
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int margin = 10; |
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if (argc >= 3) margin = atoi(argv[2]); |
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LOG(INFO) << "watchdogd started (interval " << interval << ", margin " << margin << ")!"; |
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int fd = open(DEV_NAME, O_RDWR|O_CLOEXEC); |
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if (fd == -1) { |
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PLOG(ERROR) << "Failed to open " << DEV_NAME; |
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return 1; |
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} |
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int timeout = interval + margin; |
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int ret = ioctl(fd, WDIOC_SETTIMEOUT, &timeout); |
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if (ret) { |
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PLOG(ERROR) << "Failed to set timeout to " << timeout; |
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ret = ioctl(fd, WDIOC_GETTIMEOUT, &timeout); |
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if (ret) { |
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PLOG(ERROR) << "Failed to get timeout"; |
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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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} |
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LOG(WARNING) << "Adjusted interval to timeout returned by driver: " |
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<< "timeout " << timeout |
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<< ", interval " << interval |
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<< ", margin " << margin; |
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} |
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} |
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while (true) { |
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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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} // namespace init |
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} // namespace android
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