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selftests: timers: set-timer-lat: Fix hang when testing unsupported alarms 

When timer_create() fails on a bootime or realtime clock, setup_timer()
returns 0 as if timer has been set. Callers wait forever for the timer
to expire.

This hang is seen on a system that doesn't have support for:

CLOCK_REALTIME_ALARM   ABSTIME missing CAP_WAKE_ALARM? : [UNSUPPORTED]

Test hangs waiting for a timer that hasn't been set to expire. Fix
setup_timer() to return 1, add handling in callers to detect the
unsupported case and return 0 without waiting to not fail the test.

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
This commit is contained in:
Shuah Khan 2017-09-21 13:05:18 -06:00
parent 01db7fbf54
commit eefd95e1f3
1 changed files with 6 additions and 3 deletions
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9
tools/testing/selftests/timers/set-timer-lat.c
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@ -143,7 +143,8 @@ int setup_timer(int clock_id, int flags, int interval, timer_t *tm1)
printf("%-22s %s missing CAP_WAKE_ALARM? : [UNSUPPORTED]\n",
clockstring(clock_id),
flags ? "ABSTIME":"RELTIME");
return 0;
/* Indicate timer isn't set, so caller doesn't wait */
return 1;
}
printf("%s - timer_create() failed\n", clockstring(clock_id));
return -1;
@ -213,8 +214,9 @@ int do_timer(int clock_id, int flags)
int err;
err = setup_timer(clock_id, flags, interval, &tm1);
/* Unsupported case - return 0 to not fail the test */
if (err)
return err;
return err == 1 ? 0 : err;
while (alarmcount < 5)
sleep(1);
@ -231,8 +233,9 @@ int do_timer_oneshot(int clock_id, int flags)
int err;
err = setup_timer(clock_id, flags, interval, &tm1);
/* Unsupported case - return 0 to not fail the test */
if (err)
return err;
return err == 1 ? 0 : err;
memset(&timeout, 0, sizeof(timeout));
timeout.tv_sec = 5;