1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2019 FUJITSU LIMITED. All rights reserved.
4 * Author: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
5 */
6
7/*\
8 * [Description]
9 *
10 * This is a timer sample test that timer slack is 200us.
11 */
12
13#include <errno.h>
14#include <sys/prctl.h>
15#include "lapi/prctl.h"
16#include "tst_timer_test.h"
17
18static int sample_fn(int clk_id, long long usec)
19{
20	struct timespec t = tst_timespec_from_us(usec);
21
22	tst_timer_start(clk_id);
23	TEST(nanosleep(&t, NULL));
24	tst_timer_stop();
25	tst_timer_sample();
26
27	if (TST_RET != 0) {
28		tst_res(TFAIL | TTERRNO,
29			"nanosleep() returned %li", TST_RET);
30		return 1;
31	}
32
33	return 0;
34}
35
36static void setup(void)
37{
38	TEST(prctl(PR_SET_TIMERSLACK, 200000));
39	if (TST_RET != 0)
40		tst_brk(TBROK | TTERRNO,
41			"prctl set timerslack 200us failed");
42}
43
44static struct tst_test test = {
45	.setup = setup,
46	.scall = "prctl()",
47	.sample = sample_fn,
48};
49