[WATCHDOG] Documentation/watchdog update

Documentation/watchdog/:
Expose example and tool source files in the Documentation/ directory in
their own files instead of being buried (almost hidden) in readme/txt files.

This will make them more visible/usable to users who may need
to use them, to developers who may need to test with them, and
to janitors who would update them if they were more visible.

Also, if any of these possibly should not be in the kernel tree at
all, it will be clearer that they are here and we can discuss if
they should be removed.

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Andrew Morton <akpm@osdl.org>

2 files changed, 83 insertions, 0 deletions

diff --git a/Documentation/watchdog/src/watchdog-simple.c b/Documentation/watchdog/src/watchdog-simple.c
new file mode 100644
index 000000000000..85cf17c48669
--- /dev/null
+++ b/Documentation/watchdog/src/watchdog-simple.c
@@ -0,0 +1,15 @@
+#include <stdlib.h>
+#include <fcntl.h>
+
+int main(int argc, const char *argv[]) {
+        int fd = open("/dev/watchdog", O_WRONLY);
+        if (fd == -1) {
+                perror("watchdog");
+                exit(1);
+        }
+        while (1) {
+                write(fd, "\0", 1);
+                fsync(fd);
+                sleep(10);
+        }
+}
diff --git a/Documentation/watchdog/src/watchdog-test.c b/Documentation/watchdog/src/watchdog-test.c
new file mode 100644
index 000000000000..65f6c19cb865
--- /dev/null
+++ b/Documentation/watchdog/src/watchdog-test.c
@@ -0,0 +1,68 @@
+/*
+ * Watchdog Driver Test Program
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+
+int fd;
+
+/*
+ * This function simply sends an IOCTL to the driver, which in turn ticks
+ * the PC Watchdog card to reset its internal timer so it doesn't trigger
+ * a computer reset.
+ */
+void keep_alive(void)
+{
+    int dummy;
+
+    ioctl(fd, WDIOC_KEEPALIVE, &dummy);
+}
+
+/*
+ * The main program.  Run the program with "-d" to disable the card,
+ * or "-e" to enable the card.
+ */
+int main(int argc, char *argv[])
+{
+    fd = open("/dev/watchdog", O_WRONLY);
+
+    if (fd == -1) {
+        fprintf(stderr, "Watchdog device not enabled.\n");
+        fflush(stderr);
+        exit(-1);
+    }
+
+    if (argc > 1) {
+        if (!strncasecmp(argv[1], "-d", 2)) {
+            ioctl(fd, WDIOC_SETOPTIONS, WDIOS_DISABLECARD);
+            fprintf(stderr, "Watchdog card disabled.\n");
+            fflush(stderr);
+            exit(0);
+        } else if (!strncasecmp(argv[1], "-e", 2)) {
+            ioctl(fd, WDIOC_SETOPTIONS, WDIOS_ENABLECARD);
+            fprintf(stderr, "Watchdog card enabled.\n");
+            fflush(stderr);
+            exit(0);
+        } else {
+            fprintf(stderr, "-d to disable, -e to enable.\n");
+            fprintf(stderr, "run by itself to tick the card.\n");
+            fflush(stderr);
+            exit(0);
+        }
+    } else {
+        fprintf(stderr, "Watchdog Ticking Away!\n");
+        fflush(stderr);
+    }
+
+    while(1) {
+        keep_alive();
+        sleep(1);
+    }
+}