1 /* Time inconsistency check test
2 * by: john stultz (johnstul@us.ibm.com)
3 * (C) Copyright IBM 2003, 2004, 2005, 2012
4 * (C) Copyright Linaro Limited 2015
5 * Licensed under the GPLv2
6 *
7 * To build:
8 * $ gcc inconsistency-check.c -o inconsistency-check -lrt
9 *
10 * This program is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation, either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 */
20
21
22
23 #include <stdio.h>
24 #include <unistd.h>
25 #include <stdlib.h>
26 #include <time.h>
27 #include <sys/time.h>
28 #include <sys/timex.h>
29 #include <string.h>
30 #include <signal.h>
31 #include "../kselftest.h"
32
33 #define CALLS_PER_LOOP 64
34 #define NSEC_PER_SEC 1000000000ULL
35
36 #define CLOCK_REALTIME 0
37 #define CLOCK_MONOTONIC 1
38 #define CLOCK_PROCESS_CPUTIME_ID 2
39 #define CLOCK_THREAD_CPUTIME_ID 3
40 #define CLOCK_MONOTONIC_RAW 4
41 #define CLOCK_REALTIME_COARSE 5
42 #define CLOCK_MONOTONIC_COARSE 6
43 #define CLOCK_BOOTTIME 7
44 #define CLOCK_REALTIME_ALARM 8
45 #define CLOCK_BOOTTIME_ALARM 9
46 #define CLOCK_HWSPECIFIC 10
47 #define CLOCK_TAI 11
48 #define NR_CLOCKIDS 12
49
clockstring(int clockid)50 char *clockstring(int clockid)
51 {
52 switch (clockid) {
53 case CLOCK_REALTIME:
54 return "CLOCK_REALTIME";
55 case CLOCK_MONOTONIC:
56 return "CLOCK_MONOTONIC";
57 case CLOCK_PROCESS_CPUTIME_ID:
58 return "CLOCK_PROCESS_CPUTIME_ID";
59 case CLOCK_THREAD_CPUTIME_ID:
60 return "CLOCK_THREAD_CPUTIME_ID";
61 case CLOCK_MONOTONIC_RAW:
62 return "CLOCK_MONOTONIC_RAW";
63 case CLOCK_REALTIME_COARSE:
64 return "CLOCK_REALTIME_COARSE";
65 case CLOCK_MONOTONIC_COARSE:
66 return "CLOCK_MONOTONIC_COARSE";
67 case CLOCK_BOOTTIME:
68 return "CLOCK_BOOTTIME";
69 case CLOCK_REALTIME_ALARM:
70 return "CLOCK_REALTIME_ALARM";
71 case CLOCK_BOOTTIME_ALARM:
72 return "CLOCK_BOOTTIME_ALARM";
73 case CLOCK_TAI:
74 return "CLOCK_TAI";
75 };
76 return "UNKNOWN_CLOCKID";
77 }
78
79 /* returns 1 if a <= b, 0 otherwise */
in_order(struct timespec a,struct timespec b)80 static inline int in_order(struct timespec a, struct timespec b)
81 {
82 /* use unsigned to avoid false positives on 2038 rollover */
83 if ((unsigned long)a.tv_sec < (unsigned long)b.tv_sec)
84 return 1;
85 if ((unsigned long)a.tv_sec > (unsigned long)b.tv_sec)
86 return 0;
87 if (a.tv_nsec > b.tv_nsec)
88 return 0;
89 return 1;
90 }
91
92
93
consistency_test(int clock_type,unsigned long seconds)94 int consistency_test(int clock_type, unsigned long seconds)
95 {
96 struct timespec list[CALLS_PER_LOOP];
97 int i, inconsistent;
98 long now, then;
99 time_t t;
100 char *start_str;
101
102 clock_gettime(clock_type, &list[0]);
103 now = then = list[0].tv_sec;
104
105 /* timestamp start of test */
106 t = time(0);
107 start_str = ctime(&t);
108
109 while (seconds == -1 || now - then < seconds) {
110 inconsistent = -1;
111
112 /* Fill list */
113 for (i = 0; i < CALLS_PER_LOOP; i++)
114 clock_gettime(clock_type, &list[i]);
115
116 /* Check for inconsistencies */
117 for (i = 0; i < CALLS_PER_LOOP - 1; i++)
118 if (!in_order(list[i], list[i+1]))
119 inconsistent = i;
120
121 /* display inconsistency */
122 if (inconsistent >= 0) {
123 unsigned long long delta;
124
125 printf("\%s\n", start_str);
126 for (i = 0; i < CALLS_PER_LOOP; i++) {
127 if (i == inconsistent)
128 printf("--------------------\n");
129 printf("%lu:%lu\n", list[i].tv_sec,
130 list[i].tv_nsec);
131 if (i == inconsistent + 1)
132 printf("--------------------\n");
133 }
134 delta = list[inconsistent].tv_sec * NSEC_PER_SEC;
135 delta += list[inconsistent].tv_nsec;
136 delta -= list[inconsistent+1].tv_sec * NSEC_PER_SEC;
137 delta -= list[inconsistent+1].tv_nsec;
138 printf("Delta: %llu ns\n", delta);
139 fflush(0);
140 /* timestamp inconsistency*/
141 t = time(0);
142 printf("%s\n", ctime(&t));
143 printf("[FAILED]\n");
144 return -1;
145 }
146 now = list[0].tv_sec;
147 }
148 printf("[OK]\n");
149 return 0;
150 }
151
152
main(int argc,char * argv[])153 int main(int argc, char *argv[])
154 {
155 int clockid, opt;
156 int userclock = CLOCK_REALTIME;
157 int maxclocks = NR_CLOCKIDS;
158 int runtime = 10;
159 struct timespec ts;
160
161 /* Process arguments */
162 while ((opt = getopt(argc, argv, "t:c:")) != -1) {
163 switch (opt) {
164 case 't':
165 runtime = atoi(optarg);
166 break;
167 case 'c':
168 userclock = atoi(optarg);
169 maxclocks = userclock + 1;
170 break;
171 default:
172 printf("Usage: %s [-t <secs>] [-c <clockid>]\n", argv[0]);
173 printf(" -t: Number of seconds to run\n");
174 printf(" -c: clockid to use (default, all clockids)\n");
175 exit(-1);
176 }
177 }
178
179 setbuf(stdout, NULL);
180
181 for (clockid = userclock; clockid < maxclocks; clockid++) {
182
183 if (clockid == CLOCK_HWSPECIFIC)
184 continue;
185
186 if (!clock_gettime(clockid, &ts)) {
187 printf("Consistent %-30s ", clockstring(clockid));
188 if (consistency_test(clockid, runtime))
189 return ksft_exit_fail();
190 }
191 }
192 return ksft_exit_pass();
193 }
194
