Merge tag 'linux-kselftest-4.9-rc1-update' of git://git.kernel.org/pub/scm/linux...

[cascardo/linux.git] / tools / testing / selftests / watchdog / watchdog-test.c

diff --git a/tools/testing/selftests/watchdog/watchdog-test.c b/tools/testing/selftests/watchdog/watchdog-test.c
new file mode 100644 (file)
index 0000000..6983d05
--- /dev/null
+++ b/tools/testing/selftests/watchdog/watchdog-test.c
@@ -0,0 +1,105 @@
+/*
+ * Watchdog Driver Test Program
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+
+int fd;
+const char v = 'V';
+
+/*
+ * 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.
+ */
+static void keep_alive(void)
+{
+    int dummy;
+
+    printf(".");
+    ioctl(fd, WDIOC_KEEPALIVE, &dummy);
+}
+
+/*
+ * The main program.  Run the program with "-d" to disable the card,
+ * or "-e" to enable the card.
+ */
+
+static void term(int sig)
+{
+    int ret = write(fd, &v, 1);
+
+    close(fd);
+    if (ret < 0)
+       printf("\nStopping watchdog ticks failed (%d)...\n", errno);
+    else
+       printf("\nStopping watchdog ticks...\n");
+    exit(0);
+}
+
+int main(int argc, char *argv[])
+{
+    int flags;
+    unsigned int ping_rate = 1;
+    int ret;
+
+    setbuf(stdout, NULL);
+
+    fd = open("/dev/watchdog", O_WRONLY);
+
+    if (fd == -1) {
+       printf("Watchdog device not enabled.\n");
+       exit(-1);
+    }
+
+    if (argc > 1) {
+       if (!strncasecmp(argv[1], "-d", 2)) {
+           flags = WDIOS_DISABLECARD;
+           ioctl(fd, WDIOC_SETOPTIONS, &flags);
+           printf("Watchdog card disabled.\n");
+           goto end;
+       } else if (!strncasecmp(argv[1], "-e", 2)) {
+           flags = WDIOS_ENABLECARD;
+           ioctl(fd, WDIOC_SETOPTIONS, &flags);
+           printf("Watchdog card enabled.\n");
+           goto end;
+       } else if (!strncasecmp(argv[1], "-t", 2) && argv[2]) {
+           flags = atoi(argv[2]);
+           ioctl(fd, WDIOC_SETTIMEOUT, &flags);
+           printf("Watchdog timeout set to %u seconds.\n", flags);
+           goto end;
+       } else if (!strncasecmp(argv[1], "-p", 2) && argv[2]) {
+           ping_rate = strtoul(argv[2], NULL, 0);
+           printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
+       } else {
+           printf("-d to disable, -e to enable, -t <n> to set " \
+               "the timeout,\n-p <n> to set the ping rate, and \n");
+           printf("run by itself to tick the card.\n");
+           goto end;
+       }
+    }
+
+    printf("Watchdog Ticking Away!\n");
+
+    signal(SIGINT, term);
+
+    while(1) {
+       keep_alive();
+       sleep(ping_rate);
+    }
+end:
+    ret = write(fd, &v, 1);
+    if (ret < 0)
+       printf("Stopping watchdog ticks failed (%d)...\n", errno);
+    close(fd);
+    return 0;
+}