1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2002 Andi Kleen
4 * Copyright (C) 2017 Cyril Hrubis <chrubis@suse.cz>
5 */
6
7 /*
8 * DESCRIPTION
9 * Check if gettimeofday is monotonous
10 *
11 * ALGORITHM
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 static char *str_rtime;
29 static int rtime = 10;
30
breakout(int sig)31 static void breakout(int sig)
32 {
33 done = sig;
34 }
35
verify_gettimeofday(void)36 static void verify_gettimeofday(void)
37 {
38 struct __kernel_old_timeval tv1, tv2;
39 unsigned long long cnt = 0;
40
41 done = 0;
42
43 alarm(rtime);
44
45 if (tst_syscall(__NR_gettimeofday, &tv1, NULL))
46 tst_brk(TFAIL | TERRNO, "gettimeofday() failed");
47
48 while (!done) {
49 if (tst_syscall(__NR_gettimeofday, &tv2, NULL))
50 tst_brk(TFAIL | TERRNO, "gettimeofday() failed");
51
52 if (tv2.tv_sec < tv1.tv_sec ||
53 (tv2.tv_sec == tv1.tv_sec && tv2.tv_usec < tv1.tv_usec)) {
54 tst_res(TFAIL,
55 "Time is going backwards: old %jd.%jd vs new %jd.%jd!",
56 (intmax_t) tv1.tv_sec, (intmax_t) tv1.tv_usec,
57 (intmax_t) tv2.tv_sec, (intmax_t) tv2.tv_usec);
58 return;
59 }
60
61 tv1 = tv2;
62 cnt++;
63 }
64
65 tst_res(TINFO, "gettimeofday() called %llu times", cnt);
66 tst_res(TPASS, "gettimeofday() monotonous in %i seconds", rtime);
67 }
68
setup(void)69 static void setup(void)
70 {
71 if (str_rtime) {
72 rtime = atoi(str_rtime);
73 if (rtime <= 0)
74 tst_brk(TBROK, "Invalid runtime '%s'", str_rtime);
75 tst_set_timeout(rtime + 60);
76 }
77
78 SAFE_SIGNAL(SIGALRM, breakout);
79 }
80
81 static struct tst_test test = {
82 .setup = setup,
83 .options = (struct tst_option[]) {
84 {"T:", &str_rtime, "Test iteration runtime in seconds"},
85 {},
86 },
87 .test_all = verify_gettimeofday,
88 };
89