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

   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 #ifdef KTEST
  32 #include "../kselftest.h"
  33 #else
  34 static inline int ksft_exit_pass(void)
  35 {
  36         exit(0);
  37 }
  38 static inline int ksft_exit_fail(void)
  39 {
  40         exit(1);
  41 }
  42 #endif
  43
  44 #define CALLS_PER_LOOP 64
  45 #define NSEC_PER_SEC 1000000000ULL
  46
  47 #define CLOCK_REALTIME                  0
  48 #define CLOCK_MONOTONIC                 1
  49 #define CLOCK_PROCESS_CPUTIME_ID        2
  50 #define CLOCK_THREAD_CPUTIME_ID         3
  51 #define CLOCK_MONOTONIC_RAW             4
  52 #define CLOCK_REALTIME_COARSE           5
  53 #define CLOCK_MONOTONIC_COARSE          6
  54 #define CLOCK_BOOTTIME                  7
  55 #define CLOCK_REALTIME_ALARM            8
  56 #define CLOCK_BOOTTIME_ALARM            9
  57 #define CLOCK_HWSPECIFIC                10
  58 #define CLOCK_TAI                       11
  59 #define NR_CLOCKIDS                     12
  60
  61 char *clockstring(int clockid)
  62 {
  63         switch (clockid) {
  64         case CLOCK_REALTIME:
  65                 return "CLOCK_REALTIME";
  66         case CLOCK_MONOTONIC:
  67                 return "CLOCK_MONOTONIC";
  68         case CLOCK_PROCESS_CPUTIME_ID:
  69                 return "CLOCK_PROCESS_CPUTIME_ID";
  70         case CLOCK_THREAD_CPUTIME_ID:
  71                 return "CLOCK_THREAD_CPUTIME_ID";
  72         case CLOCK_MONOTONIC_RAW:
  73                 return "CLOCK_MONOTONIC_RAW";
  74         case CLOCK_REALTIME_COARSE:
  75                 return "CLOCK_REALTIME_COARSE";
  76         case CLOCK_MONOTONIC_COARSE:
  77                 return "CLOCK_MONOTONIC_COARSE";
  78         case CLOCK_BOOTTIME:
  79                 return "CLOCK_BOOTTIME";
  80         case CLOCK_REALTIME_ALARM:
  81                 return "CLOCK_REALTIME_ALARM";
  82         case CLOCK_BOOTTIME_ALARM:
  83                 return "CLOCK_BOOTTIME_ALARM";
  84         case CLOCK_TAI:
  85                 return "CLOCK_TAI";
  86         };
  87         return "UNKNOWN_CLOCKID";
  88 }
  89
  90 /* returns 1 if a <= b, 0 otherwise */
  91 static inline int in_order(struct timespec a, struct timespec b)
  92 {
  93         /* use unsigned to avoid false positives on 2038 rollover */
  94         if ((unsigned long)a.tv_sec < (unsigned long)b.tv_sec)
  95                 return 1;
  96         if ((unsigned long)a.tv_sec > (unsigned long)b.tv_sec)
  97                 return 0;
  98         if (a.tv_nsec > b.tv_nsec)
  99                 return 0;
 100         return 1;
 101 }
 102
 103
 104
 105 int consistency_test(int clock_type, unsigned long seconds)
 106 {
 107         struct timespec list[CALLS_PER_LOOP];
 108         int i, inconsistent;
 109         long now, then;
 110         time_t t;
 111         char *start_str;
 112
 113         clock_gettime(clock_type, &list[0]);
 114         now = then = list[0].tv_sec;
 115
 116         /* timestamp start of test */
 117         t = time(0);
 118         start_str = ctime(&t);
 119
 120         while (seconds == -1 || now - then < seconds) {
 121                 inconsistent = 0;
 122
 123                 /* Fill list */
 124                 for (i = 0; i < CALLS_PER_LOOP; i++)
 125                         clock_gettime(clock_type, &list[i]);
 126
 127                 /* Check for inconsistencies */
 128                 for (i = 0; i < CALLS_PER_LOOP - 1; i++)
 129                         if (!in_order(list[i], list[i+1]))
 130                                 inconsistent = i;
 131
 132                 /* display inconsistency */
 133                 if (inconsistent) {
 134                         unsigned long long delta;
 135
 136                         printf("\%s\n", start_str);
 137                         for (i = 0; i < CALLS_PER_LOOP; i++) {
 138                                 if (i == inconsistent)
 139                                         printf("--------------------\n");
 140                                 printf("%lu:%lu\n", list[i].tv_sec,
 141                                                         list[i].tv_nsec);
 142                                 if (i == inconsistent + 1)
 143                                         printf("--------------------\n");
 144                         }
 145                         delta = list[inconsistent].tv_sec * NSEC_PER_SEC;
 146                         delta += list[inconsistent].tv_nsec;
 147                         delta -= list[inconsistent+1].tv_sec * NSEC_PER_SEC;
 148                         delta -= list[inconsistent+1].tv_nsec;
 149                         printf("Delta: %llu ns\n", delta);
 150                         fflush(0);
 151                         /* timestamp inconsistency*/
 152                         t = time(0);
 153                         printf("%s\n", ctime(&t));
 154                         printf("[FAILED]\n");
 155                         return -1;
 156                 }
 157                 now = list[0].tv_sec;
 158         }
 159         printf("[OK]\n");
 160         return 0;
 161 }
 162
 163
 164 int main(int argc, char *argv[])
 165 {
 166         int clockid, opt;
 167         int userclock = CLOCK_REALTIME;
 168         int maxclocks = NR_CLOCKIDS;
 169         int runtime = 30;
 170         struct timespec ts;
 171
 172         /* Process arguments */
 173         while ((opt = getopt(argc, argv, "t:c:")) != -1) {
 174                 switch (opt) {
 175                 case 't':
 176                         runtime = atoi(optarg);
 177                         break;
 178                 case 'c':
 179                         userclock = atoi(optarg);
 180                         maxclocks = userclock + 1;
 181                         break;
 182                 default:
 183                         printf("Usage: %s [-t <secs>] [-c <clockid>]\n", argv[0]);
 184                         printf("        -t: Number of seconds to run\n");
 185                         printf("        -c: clockid to use (default, all clockids)\n");
 186                         exit(-1);
 187                 }
 188         }
 189
 190         setbuf(stdout, NULL);
 191
 192         for (clockid = userclock; clockid < maxclocks; clockid++) {
 193
 194                 if (clockid == CLOCK_HWSPECIFIC)
 195                         continue;
 196
 197                 if (!clock_gettime(clockid, &ts)) {
 198                         printf("Consistent %-30s ", clockstring(clockid));
 199                         if (consistency_test(clockid, runtime))
 200                                 return ksft_exit_fail();
 201                 }
 202         }
 203         return ksft_exit_pass();
 204 }