1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2002 Andi Kleen
4 * Copyright (C) 2017 Cyril Hrubis <[email protected]>
5 */
6
7 /*\
8 * [Description]
9 *
10 * Check if gettimeofday() is monotonous during 10s:
11 *
12 * - Call gettimeofday() to get a t1 (fist value)
13 * - Call it again to get t2, see if t2 < t1, set t2 = t1, repeat for 10 sec
14 */
15
16 #include <stdint.h>
17 #include <sys/time.h>
18 #include <stdlib.h>
19 #include <unistd.h>
20 #include <time.h>
21 #include <errno.h>
22
23 #include "tst_test.h"
24 #include "tst_timer.h"
25 #include "lapi/syscalls.h"
26
27 static volatile sig_atomic_t done;
28
breakout(int sig)29 static void breakout(int sig)
30 {
31 done = sig;
32 }
33
verify_gettimeofday(void)34 static void verify_gettimeofday(void)
35 {
36 struct __kernel_old_timeval tv1, tv2;
37 unsigned long long cnt = 0;
38 int rtime = tst_remaining_runtime();
39
40 done = 0;
41
42 alarm(rtime);
43
44 if (tst_syscall(__NR_gettimeofday, &tv1, NULL))
45 tst_brk(TFAIL | TERRNO, "gettimeofday() failed");
46
47 while (!done) {
48 if (tst_syscall(__NR_gettimeofday, &tv2, NULL))
49 tst_brk(TFAIL | TERRNO, "gettimeofday() failed");
50
51 if (tv2.tv_sec < tv1.tv_sec ||
52 (tv2.tv_sec == tv1.tv_sec && tv2.tv_usec < tv1.tv_usec)) {
53 tst_res(TFAIL,
54 "Time is going backwards: old %jd.%jd vs new %jd.%jd!",
55 (intmax_t) tv1.tv_sec, (intmax_t) tv1.tv_usec,
56 (intmax_t) tv2.tv_sec, (intmax_t) tv2.tv_usec);
57 return;
58 }
59
60 tv1 = tv2;
61 cnt++;
62 }
63
64 tst_res(TINFO, "gettimeofday() called %llu times", cnt);
65 tst_res(TPASS, "gettimeofday() monotonous in %i seconds", rtime);
66 }
67
setup(void)68 static void setup(void)
69 {
70 SAFE_SIGNAL(SIGALRM, breakout);
71 }
72
73 static struct tst_test test = {
74 .setup = setup,
75 .max_runtime = 10,
76 .test_all = verify_gettimeofday,
77 };
78