On 07/19/2016 08:41 AM, Arnd Bergmann wrote:
A recent commit added a write to the watchdog test code for doing the "magic
close", but that caused a compile-time warning:
Documentation/watchdog/src/watchdog-test.c: In function ‘main’:
Documentation/watchdog/src/watchdog-test.c:94:5: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
This changes the code to print a runtime warning if the write fails.
Fixes: 5a2d3de19602 ("Documentation/watchdog: add support for magic close to watchdog-test")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
v2: fix typo as pointed out by both Guenter Roeck and Randy Dunlap
---
Documentation/watchdog/src/watchdog-test.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/Documentation/watchdog/src/watchdog-test.c b/Documentation/watchdog/src/watchdog-test.c
index c69153913722..6983d05097e2 100644
--- a/Documentation/watchdog/src/watchdog-test.c
+++ b/Documentation/watchdog/src/watchdog-test.c
@@ -2,6 +2,7 @@
* Watchdog Driver Test Program
*/
+#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -35,9 +36,13 @@ static void keep_alive(void)
static void term(int sig)
{
- write(fd, &v, 1);
+ int ret = write(fd, &v, 1);
+
close(fd);
- printf("\nStopping watchdog ticks...\n");
+ if (ret < 0)
+ printf("\nStopping watchdog ticks failed (%d)...\n", errno);
+ else
+ printf("\nStopping watchdog ticks...\n");
exit(0);
}
@@ -45,6 +50,7 @@ int main(int argc, char *argv[])
{
int flags;
unsigned int ping_rate = 1;
+ int ret;
setbuf(stdout, NULL);
@@ -91,7 +97,9 @@ int main(int argc, char *argv[])
sleep(ping_rate);
}
end:
- write(fd, &v, 1);
+ ret = write(fd, &v, 1);
+ if (ret < 0)
+ printf("Stopping watchdog ticks failed (%d)...\n", errno);
close(fd);
return 0;
}
--
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