[PATCH v6] selftests: rtc: Fixes rtctest error handling.

[Atul Kumar Pant]

Adds a check to verify if the rtc device file is valid or not
and prints a useful error message if the file is not accessible.

Signed-off-by: Atul Kumar Pant <atulpant.linux@xxxxxxxxx>
---

changes since v5:
    Updated error message to use strerror().
	If the rtc file is invalid, the skip the test.

changes since v4:
    Updated the commit message.

changes since v3:
    Added Linux-kselftest and Linux-kernel mailing lists.

changes since v2:
    Changed error message when rtc file does not exist.

changes since v1:
    Removed check for uid=0
    If rtc file is invalid, then exit the test.

 tools/testing/selftests/rtc/rtctest.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/rtc/rtctest.c b/tools/testing/selftests/rtc/rtctest.c
index 630fef735c7e..27b466111885 100644
--- a/tools/testing/selftests/rtc/rtctest.c
+++ b/tools/testing/selftests/rtc/rtctest.c
@@ -15,6 +15,7 @@
 #include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
+#include <error.h>
 
 #include "../kselftest_harness.h"
 #include "../kselftest.h"
@@ -437,7 +438,7 @@ int main(int argc, char **argv)
 	if (access(rtc_file, F_OK) == 0)
 		ret = test_harness_run(argc, argv);
 	else
-		ksft_exit_fail_msg("[ERROR]: Cannot access rtc file %s - Exiting\n", rtc_file);
+		ksft_exit_skip("%s: %s\n", rtc_file, strerror(errno));
 
 	return ret;
 }
-- 
2.25.1