// commit 5f95f965e933c5b155db75520ac27c92ddbcf400 2014-03-18

// syscall should not sign extend pointers on x32

#define _GNU_SOURCE

#include <string.h>

#include <errno.h>

#include <unistd.h>

#include <time.h>

#include <sys/syscall.h>

#include "test.h"

#define T(f) ((f) && (t_error(#f " failed: %s\n", strerror(errno)), 0))

static unsigned long long tsdiff(struct timespec ts2, struct timespec ts)

{

	if (ts2.tv_nsec < ts.tv_nsec) {

		ts2.tv_nsec += 1000000000;

		ts2.tv_sec--;

	}

	if (ts2.tv_sec < ts.tv_sec) {

		t_error("non-monotonic SYS_clock_gettime vs clock_gettime: %llu ns\n",

			(ts.tv_sec - ts2.tv_sec)*1000000000ULL + ts.tv_nsec - ts2.tv_nsec);

		return 0;

	}

	return (ts2.tv_sec - ts.tv_sec)*1000000000ULL + (ts2.tv_nsec - ts.tv_nsec);

}

int main(void)

{

	struct timespec ts, ts2;

	unsigned long long diff;

	// test syscall with pointer

	T(syscall(SYS_clock_gettime, CLOCK_REALTIME, &ts);;

	// check if timespec is filled correctly

	T(clock_gettime(CLOCK_REALTIME, &ts2));

	// adjust because linux vdso is non-monotonic wrt the syscall..

	ts.tv_nsec += 2;

	diff = tsdiff(ts2, ts);

	if (diff > 5 * 1000000000ULL)

		t_error("large diff between clock_gettime calls: %llu ns\n", diff);

	return t_status;

}