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authorShuah Khan <shuahkh@osg.samsung.com>2017-09-21 13:05:18 -0600
committerShuah Khan <shuahkh@osg.samsung.com>2017-09-25 10:09:07 -0600
commiteefd95e1f3d47b90dc768e9ebc77d390c4f34809 (patch)
tree0ff7cd4c9d969e3f41263fdfc33c9c08ebd8af0a
parentselftests: timers: set-timer-lat: fix hang when std out/err are redirected (diff)
downloadwireguard-linux-eefd95e1f3d47b90dc768e9ebc77d390c4f34809.tar.xz
wireguard-linux-eefd95e1f3d47b90dc768e9ebc77d390c4f34809.zip
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>
-rw-r--r--tools/testing/selftests/timers/set-timer-lat.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/tools/testing/selftests/timers/set-timer-lat.c b/tools/testing/selftests/timers/set-timer-lat.c
index ea1af5dbc7b6..50da45437daa 100644
--- a/tools/testing/selftests/timers/set-timer-lat.c
+++ b/tools/testing/selftests/timers/set-timer-lat.c
@@ -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;