Resguardo inicial

linux-7.2.3/samples/watchdog/.gitignore

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+# SPDX-License-Identifier: GPL-2.0-only
+/watchdog-simple

linux-7.2.3/samples/watchdog/Makefile

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+# SPDX-License-Identifier: GPL-2.0
+userprogs-always-y += watchdog-simple

linux-7.2.3/samples/watchdog/watchdog-simple.c

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+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+int main(void)
+{
+	int fd = open("/dev/watchdog", O_WRONLY);
+	int ret = 0;
+	if (fd == -1) {
+		perror("watchdog");
+		exit(EXIT_FAILURE);
+	}
+	while (1) {
+		ret = write(fd, "\0", 1);
+		if (ret != 1) {
+			ret = -1;
+			break;
+		}
+		sleep(10);
+	}
+	close(fd);
+	return ret;
+}