1 /*
2 * Copyright (C) 2002 Andi Kleen
3 * Copyright (C) 2017 Cyril Hrubis <chrubis@suse.cz>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20 /*
21 * DESCRIPTION
22 * Check if gettimeofday is monotonous
23 *
24 * ALGORITHM
25 * Call gettimeofday() to get a t1 (fist value)
26 * call it again to get t2, see if t2 < t1, set t2 = t1, repeat for 10 sec
27 */
28
29 #include <stdint.h>
30 #include <sys/time.h>
31 #include <stdlib.h>
32 #include <sys/syscall.h>
33 #include <unistd.h>
34 #include <time.h>
35 #include <errno.h>
36
37 #include "tst_test.h"
38
39 #define gettimeofday(a,b) syscall(__NR_gettimeofday,a,b)
40
41 static volatile sig_atomic_t done;
42 static char *str_rtime;
43 static int rtime = 10;
44
45 static struct tst_option options[] = {
46 {"T:", &str_rtime, "-T len Test iteration runtime in seconds"},
47 {NULL, NULL, NULL},
48 };
49
breakout(int sig)50 static void breakout(int sig)
51 {
52 done = sig;
53 }
54
verify_gettimeofday(void)55 static void verify_gettimeofday(void)
56 {
57 struct timeval tv1, tv2;
58 unsigned long long cnt = 0;
59
60 done = 0;
61
62 alarm(rtime);
63
64 if (gettimeofday(&tv1, NULL)) {
65 tst_res(TBROK | TERRNO, "gettimeofday() failed");
66 return;
67 }
68
69 while (!done) {
70 if (gettimeofday(&tv2, NULL)) {
71 tst_res(TBROK | TERRNO, "gettimeofday() failed");
72 return;
73 }
74
75 if (tv2.tv_sec < tv1.tv_sec ||
76 (tv2.tv_sec == tv1.tv_sec && tv2.tv_usec < tv1.tv_usec)) {
77 tst_res(TFAIL,
78 "Time is going backwards: old %jd.%jd vs new %jd.%jd!",
79 (intmax_t) tv1.tv_sec, (intmax_t) tv1.tv_usec,
80 (intmax_t) tv2.tv_sec, (intmax_t) tv2.tv_usec);
81 return;
82 }
83
84 tv1 = tv2;
85 cnt++;
86 }
87
88
89 tst_res(TINFO, "gettimeofday() called %llu times", cnt);
90 tst_res(TPASS, "gettimeofday() monotonous in %i seconds", rtime);
91 }
92
setup(void)93 static void setup(void)
94 {
95 if (str_rtime) {
96 rtime = atoi(str_rtime);
97 if (rtime <= 0)
98 tst_brk(TBROK, "Invalid runtime '%s'", str_rtime);
99 tst_set_timeout(rtime + 60);
100 }
101
102 SAFE_SIGNAL(SIGALRM, breakout);
103 }
104
105 static struct tst_test test = {
106 .setup = setup,
107 .options = options,
108 .test_all = verify_gettimeofday,
109 };
110