1 /* Time inconsistency check test 2 * by: john stultz (johnstul (at) 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 = 10; 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 } 205
