linux-kernel - [PATCH] selftests: timers: improve timer

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Message-ID: <20240829153725.4437-1-gianf.trad@gmail.com>
Date: Thu, 29 Aug 2024 17:37:25 +0200
From: Gianfranco Trad <gianf.trad@...il.com>
To: jstultz@...gle.com,
	tglx@...utronix.de,
	sboyd@...nel.org,
	anna-maria@...utronix.de,
	frederic@...nel.org,
	shuah@...nel.org
Cc: linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	Gianfranco Trad <gianf.trad@...il.com>
Subject: [PATCH] selftests: timers: improve timer_create failure message

improve timer_create failure message with strerror() function
to give more information to the user.

Signed-off-by: Gianfranco Trad <gianf.trad@...il.com>
---
 tools/testing/selftests/timers/alarmtimer-suspend.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/timers/alarmtimer-suspend.c b/tools/testing/selftests/timers/alarmtimer-suspend.c
index ad52e608b88e..74acdb87d4f4 100644
--- a/tools/testing/selftests/timers/alarmtimer-suspend.c
+++ b/tools/testing/selftests/timers/alarmtimer-suspend.c
@@ -28,6 +28,7 @@
 #include <signal.h>
 #include <stdlib.h>
 #include <pthread.h>
+#include <errno.h>
 #include "../kselftest.h"
 
 #define CLOCK_REALTIME			0
@@ -142,8 +143,8 @@ int main(void)
 
 		alarmcount = 0;
 		if (timer_create(alarm_clock_id, &se, &tm1) == -1) {
-			printf("timer_create failed, %s unsupported?\n",
-					clockstring(alarm_clock_id));
+			printf("timer_create failed, %s unsupported?: %s\n",
+					clockstring(alarm_clock_id), strerror(errno));
 			break;
 		}
 
-- 
2.43.0