zdtm: make posix timer migration test use corresponding clocks

For vz containers, monotonic time freezes when a container is
checkpointed. This makes the zdtm posix timer test fail.

To fix this, obtain time passed, which is used to check timer results,
using the clock used by the timer.
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Acked-by: Stanislav Kinsbursky <skinsbursky@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm/live/static/posix_timers.c

@@ -9,7 +9,6 @@
 const char *test_doc ="Posix timers migration check";
 const char *test_author = "Kinsbursky Stanislav <skinsbursky@parallels.com>";
 
-struct timespec start;
 sigset_t mask;
 
 #define WRONG_SIGNAL		1
@@ -32,6 +31,7 @@ static struct posix_timers_info {
 	int handler_cnt;
 	timer_t timerid;
 	int overrun;
+	struct timespec start, end;
 } posix_timers[] = {
 	[CLOCK_REALTIME] = {CLOCK_REALTIME, "REALTIME", realtime_handler, SIGALRM, 1},
 	[CLOCK_MONOTONIC] = {CLOCK_MONOTONIC, "MONOTONIC", monotonic_handler, SIGINT, 3},
@@ -81,7 +81,6 @@ static int check_handler_status(struct posix_timers_info *info, int ms_passed)
 static int check_timers(void)
 {
 	struct posix_timers_info *info = posix_timers;
-	struct timespec end;
 	int ms_passed;
 	int status = 0;
 
@@ -90,18 +89,20 @@ static int check_timers(void)
 		return -errno;
 	}
 
-       if (clock_gettime(CLOCK_REALTIME, &end) == -1) {
-		fail("Can't get end time\n");
-		return -errno;
-	}
-
-	ms_passed = (end.tv_sec - start.tv_sec) * 1000 + (end.tv_nsec - start.tv_nsec) / (1000 * 1000);
-
 	while (info->handler) {
 		if (timer_delete(info->timerid) == -1) {
 			fail("%s: Failed to delete timer\n", info->name);
 			return -errno;
 		}
+
+		if (clock_gettime(info->clock, &info->end) == -1) {
+			fail("Can't get %s end time\n", info->name);
+			return -errno;
+		}
+
+		ms_passed = (info->end.tv_sec - info->start.tv_sec) * 1000 +
+			(info->end.tv_nsec - info->start.tv_nsec) / (1000 * 1000);
+
 		if (check_handler_status(info, ms_passed))
 			status--;
 		info++;
@@ -146,11 +147,6 @@ static int setup_timers(void)
 	struct sigevent sev;
 	struct itimerspec its;
 
-	if (clock_gettime(CLOCK_REALTIME, &start) == -1) {
-		err("Can't get start time\n");
-		return -errno;
-	}
-
 	sigemptyset(&mask);
 	while(info->handler) {
 		sigaddset(&mask, info->sig);
@@ -187,6 +183,11 @@ static int setup_timers(void)
 		its.it_interval.tv_sec = its.it_value.tv_sec;
 		its.it_interval.tv_nsec = its.it_value.tv_nsec;
 
+		if (clock_gettime(info->clock, &info->start) == -1) {
+			err("Can't get %s start time\n", info->name);
+			return -errno;
+		}
+
 		if (timer_settime(info->timerid, 0, &its, NULL) == -1) {
 			err("Can't set timer\n");
 			return -errno;