samples: move watchdog example code from Documentation

Move watchdog examples to samples and remove it from Documentation
Makefile. Create a new Makefile to build watchdog. It can be built
from top level directory or from watchdog directory:

Run make -C samples/watchdog or cd samples/watchdog; make

Acked-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

3 files changed, 33 insertions, 0 deletions

diff --git a/samples/watchdog/.gitignore b/samples/watchdog/.gitignore
new file mode 100644
index 000000000000..ff0ebb540333
--- /dev/null
+++ b/samples/watchdog/.gitignore
@@ -0,0 +1 @@
+watchdog-simple
diff --git a/samples/watchdog/Makefile b/samples/watchdog/Makefile
new file mode 100644
index 000000000000..9b53d89b1ccf
--- /dev/null
+++ b/samples/watchdog/Makefile
@@ -0,0 +1,8 @@
+CC := $(CROSS_COMPILE)gcc
+PROGS := watchdog-simple
+
+all: $(PROGS)
+
+clean:
+        rm -fr $(PROGS)
+
diff --git a/samples/watchdog/watchdog-simple.c b/samples/watchdog/watchdog-simple.c
new file mode 100644
index 000000000000..ba45803a2216
--- /dev/null
+++ b/samples/watchdog/watchdog-simple.c
@@ -0,0 +1,24 @@
+#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;
+}