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 * Test Description:
9 * This is a timer sample test that timer slack is 200us.
10 */
11
12 #include <errno.h>
13 #include <sys/prctl.h>
14 #include "lapi/prctl.h"
15 #include "tst_timer_test.h"
16
sample_fn(int clk_id,long long usec)17 int sample_fn(int clk_id, long long usec)
18 {
19 struct timespec t = tst_timespec_from_us(usec);
20
21 tst_timer_start(clk_id);
22 TEST(nanosleep(&t, NULL));
23 tst_timer_stop();
24 tst_timer_sample();
25
26 if (TST_RET != 0) {
27 tst_res(TFAIL | TTERRNO,
28 "nanosleep() returned %li", TST_RET);
29 return 1;
30 }
31
32 return 0;
33 }
34
setup(void)35 static void setup(void)
36 {
37 TEST(prctl(PR_SET_TIMERSLACK, 200000));
38 if (TST_RET != 0)
39 tst_brk(TBROK | TTERRNO,
40 "prctl set timerslack 200us failed");
41 }
42
43 static struct tst_test test = {
44 .setup = setup,
45 .scall = "prctl()",
46 .sample = sample_fn,
47 };
48