[PATCH for-next 2/3] selftests/watchdog: exit watchdog-test with error code

[Li Zhijian]

So that we can check its exit code to judge whether it succeeds
or not.

Signed-off-by: Li Zhijian <lizhij...@fujitsu.com>
---
 .../testing/selftests/watchdog/watchdog-test.c  | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/watchdog/watchdog-test.c 
b/tools/testing/selftests/watchdog/watchdog-test.c
index 2f8fd2670897..d42fc2fd790d 100644
--- a/tools/testing/selftests/watchdog/watchdog-test.c
+++ b/tools/testing/selftests/watchdog/watchdog-test.c
@@ -51,7 +51,7 @@ static const struct option lopts[] = {
  * the PC Watchdog card to reset its internal timer so it doesn't trigger
  * a computer reset.
  */
-static void keep_alive(void)
+static int keep_alive(void)
 {
        int dummy;
        int ret;
@@ -59,6 +59,8 @@ static void keep_alive(void)
        ret = ioctl(fd, WDIOC_KEEPALIVE, &dummy);
        if (!ret)
                printf(".");
+
+       return ret;
 }
 
 /*
@@ -175,7 +177,7 @@ int main(int argc, char *argv[])
        int flags;
        unsigned int ping_rate = DEFAULT_PING_RATE;
        int ret;
-       int c;
+       int c, n;
        int oneshot = 0, stop = 1, count = 0;
        char *file = "/dev/watchdog";
        struct watchdog_info info;
@@ -342,7 +344,9 @@ int main(int argc, char *argv[])
        signal(SIGINT, term);
 
        while (stop || count--) {
-               exit_code = keep_alive();
+               ret = keep_alive();
+               if (ret)
+                       goto end;
                sleep(ping_rate);
        }
 end:
@@ -350,9 +354,10 @@ int main(int argc, char *argv[])
         * Send specific magic character 'V' just in case Magic Close is
         * enabled to ensure watchdog gets disabled on close.
         */
-       ret = write(fd, &v, 1);
-       if (ret < 0)
+       n = write(fd, &v, 1);
+       if (n < 0)
                printf("Stopping watchdog ticks failed (%d)...\n", errno);
        close(fd);
-       return 0;
+
+       return ret || n < 0;
 }
-- 
2.44.0