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Linux/tools/testing/selftests/timers/inconsistency-check.c

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  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 
 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 */
 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 
 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 
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 

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