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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <errno.h>
#include <fcntl.h>
#include <glob.h>
#include <linux/watchdog.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define DEV_GLOB "/sys/devices/platform/*.watchdog_cl0/watchdog/watchdog*"
using android::base::Basename;
using android::base::StringPrintf;
int main(int argc, char** argv) {
android::base::InitLogging(argv, &android::base::KernelLogger);
int interval = 10;
if (argc >= 2) interval = atoi(argv[1]);
int margin = 10;
if (argc >= 3) margin = atoi(argv[2]);
LOG(INFO) << "gs_watchdogd started (interval " << interval << ", margin " << margin << ")!";
glob_t globbuf;
int ret = glob(DEV_GLOB, GLOB_MARK, nullptr, &globbuf);
if (ret) {
PLOG(ERROR) << "Failed to lookup glob " << DEV_GLOB << ": " << ret;
return 1;
}
if (globbuf.gl_pathc > 1) {
PLOG(WARNING) << "Multiple watchdog dev path found by " << DEV_GLOB;
}
std::string dev_path = StringPrintf("/dev/%s", Basename(globbuf.gl_pathv[0]).c_str());
globfree(&globbuf);
int fd = open(dev_path.c_str(), O_RDWR | O_CLOEXEC);
if (fd == -1) {
PLOG(ERROR) << "Failed to open " << dev_path;
return 1;
}
int timeout = interval + margin;
ret = ioctl(fd, WDIOC_SETTIMEOUT, &timeout);
if (ret) {
PLOG(ERROR) << "Failed to set timeout to " << timeout;
ret = ioctl(fd, WDIOC_GETTIMEOUT, &timeout);
if (ret) {
PLOG(ERROR) << "Failed to get timeout";
} else {
if (timeout > margin) {
interval = timeout - margin;
} else {
interval = 1;
}
LOG(WARNING) << "Adjusted interval to timeout returned by driver: "
<< "timeout " << timeout << ", interval " << interval << ", margin "
<< margin;
}
}
while (true) {
write(fd, "", 1);
sleep(interval);
}
}
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