Initial commit.

disable_watchdog.cpp

@@ -0,0 +1,77 @@
+/*
+   Copyright 2025 Yağız Zengin
+
+   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 <unistd.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <iostream>
+#include <list>
+
+#define LOG_TAG "disable_watchdog"
+#include <android/log.h>
+#include <android/log_macros.h>
+
+bool suspendWatchdog(std::list<const char*> files)
+{
+	bool suspendOk = false;
+
+	for (const auto& file : files) {
+		int fd = open(file, O_WRONLY);
+		if (fd == -1) {
+			if (errno == ENOENT) {
+				int last = errno;
+				fd = open(file, O_WRONLY | O_CREAT, 644);
+				if (fd == -1) {
+					ALOGW("Cannot create %s: %s\n", file, strerror(errno));
+					continue;
+				}
+			} else {
+				ALOGW("Cannot open %s: %s\n", file, strerror(errno));
+				continue;
+			}
+		}
+
+		char ch = 'V';
+		if (write(fd, &ch, 1) != 1) {
+			ALOGW("Cannot write %s: %s\n", file, strerror(errno));
+			close(fd);
+			continue;
+		}
+
+		suspendOk = true;
+		ALOGI("%s: successfully suspended.\n", file);
+		close(fd);
+	}
+
+	return suspendOk;
+}
+
+int main(void)
+{
+	ALOGI("Service started.\n");
+
+	while (1) {
+		if (!suspendWatchdog({"/dev/watchdog1", "/dev/watchdog0", "/dev/watchdog"})) {
+			ALOGE("watchdog suspend fail!\n");
+			break;
+		}
+		sleep(8);
+	}
+
+	ALOGI("Service stopped!\n");
+	return 1;
+}