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193 lines
4.7 KiB
193 lines
4.7 KiB
/* Time inconsistency check test |
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* by: john stultz ([email protected]) |
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* (C) Copyright IBM 2003, 2004, 2005, 2012 |
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* (C) Copyright Linaro Limited 2015 |
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* Licensed under the GPLv2 |
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* |
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* To build: |
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* $ gcc inconsistency-check.c -o inconsistency-check -lrt |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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*/ |
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#include <stdio.h> |
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#include <unistd.h> |
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#include <stdlib.h> |
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#include <time.h> |
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#include <sys/time.h> |
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#include <sys/timex.h> |
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#include <string.h> |
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#include <signal.h> |
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#include "../kselftest.h" |
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#define CALLS_PER_LOOP 64 |
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#define NSEC_PER_SEC 1000000000ULL |
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#define CLOCK_REALTIME 0 |
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#define CLOCK_MONOTONIC 1 |
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#define CLOCK_PROCESS_CPUTIME_ID 2 |
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#define CLOCK_THREAD_CPUTIME_ID 3 |
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#define CLOCK_MONOTONIC_RAW 4 |
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#define CLOCK_REALTIME_COARSE 5 |
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#define CLOCK_MONOTONIC_COARSE 6 |
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#define CLOCK_BOOTTIME 7 |
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#define CLOCK_REALTIME_ALARM 8 |
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#define CLOCK_BOOTTIME_ALARM 9 |
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#define CLOCK_HWSPECIFIC 10 |
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#define CLOCK_TAI 11 |
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#define NR_CLOCKIDS 12 |
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char *clockstring(int clockid) |
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{ |
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switch (clockid) { |
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case CLOCK_REALTIME: |
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return "CLOCK_REALTIME"; |
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case CLOCK_MONOTONIC: |
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return "CLOCK_MONOTONIC"; |
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case CLOCK_PROCESS_CPUTIME_ID: |
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return "CLOCK_PROCESS_CPUTIME_ID"; |
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case CLOCK_THREAD_CPUTIME_ID: |
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return "CLOCK_THREAD_CPUTIME_ID"; |
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case CLOCK_MONOTONIC_RAW: |
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return "CLOCK_MONOTONIC_RAW"; |
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case CLOCK_REALTIME_COARSE: |
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return "CLOCK_REALTIME_COARSE"; |
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case CLOCK_MONOTONIC_COARSE: |
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return "CLOCK_MONOTONIC_COARSE"; |
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case CLOCK_BOOTTIME: |
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return "CLOCK_BOOTTIME"; |
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case CLOCK_REALTIME_ALARM: |
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return "CLOCK_REALTIME_ALARM"; |
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case CLOCK_BOOTTIME_ALARM: |
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return "CLOCK_BOOTTIME_ALARM"; |
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case CLOCK_TAI: |
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return "CLOCK_TAI"; |
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}; |
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return "UNKNOWN_CLOCKID"; |
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} |
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/* returns 1 if a <= b, 0 otherwise */ |
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static inline int in_order(struct timespec a, struct timespec b) |
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{ |
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/* use unsigned to avoid false positives on 2038 rollover */ |
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if ((unsigned long)a.tv_sec < (unsigned long)b.tv_sec) |
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return 1; |
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if ((unsigned long)a.tv_sec > (unsigned long)b.tv_sec) |
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return 0; |
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if (a.tv_nsec > b.tv_nsec) |
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return 0; |
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return 1; |
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} |
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int consistency_test(int clock_type, unsigned long seconds) |
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{ |
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struct timespec list[CALLS_PER_LOOP]; |
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int i, inconsistent; |
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long now, then; |
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time_t t; |
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char *start_str; |
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clock_gettime(clock_type, &list[0]); |
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now = then = list[0].tv_sec; |
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/* timestamp start of test */ |
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t = time(0); |
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start_str = ctime(&t); |
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while (seconds == -1 || now - then < seconds) { |
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inconsistent = -1; |
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/* Fill list */ |
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for (i = 0; i < CALLS_PER_LOOP; i++) |
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clock_gettime(clock_type, &list[i]); |
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/* Check for inconsistencies */ |
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for (i = 0; i < CALLS_PER_LOOP - 1; i++) |
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if (!in_order(list[i], list[i+1])) |
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inconsistent = i; |
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/* display inconsistency */ |
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if (inconsistent >= 0) { |
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unsigned long long delta; |
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printf("\%s\n", start_str); |
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for (i = 0; i < CALLS_PER_LOOP; i++) { |
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if (i == inconsistent) |
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printf("--------------------\n"); |
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printf("%lu:%lu\n", list[i].tv_sec, |
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list[i].tv_nsec); |
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if (i == inconsistent + 1) |
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printf("--------------------\n"); |
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} |
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delta = list[inconsistent].tv_sec * NSEC_PER_SEC; |
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delta += list[inconsistent].tv_nsec; |
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delta -= list[inconsistent+1].tv_sec * NSEC_PER_SEC; |
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delta -= list[inconsistent+1].tv_nsec; |
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printf("Delta: %llu ns\n", delta); |
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fflush(0); |
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/* timestamp inconsistency*/ |
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t = time(0); |
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printf("%s\n", ctime(&t)); |
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printf("[FAILED]\n"); |
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return -1; |
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} |
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now = list[0].tv_sec; |
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} |
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printf("[OK]\n"); |
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return 0; |
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} |
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int main(int argc, char *argv[]) |
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{ |
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int clockid, opt; |
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int userclock = CLOCK_REALTIME; |
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int maxclocks = NR_CLOCKIDS; |
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int runtime = 10; |
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struct timespec ts; |
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/* Process arguments */ |
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while ((opt = getopt(argc, argv, "t:c:")) != -1) { |
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switch (opt) { |
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case 't': |
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runtime = atoi(optarg); |
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break; |
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case 'c': |
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userclock = atoi(optarg); |
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maxclocks = userclock + 1; |
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break; |
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default: |
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printf("Usage: %s [-t <secs>] [-c <clockid>]\n", argv[0]); |
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printf(" -t: Number of seconds to run\n"); |
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printf(" -c: clockid to use (default, all clockids)\n"); |
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exit(-1); |
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} |
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} |
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setbuf(stdout, NULL); |
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for (clockid = userclock; clockid < maxclocks; clockid++) { |
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if (clockid == CLOCK_HWSPECIFIC) |
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continue; |
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if (!clock_gettime(clockid, &ts)) { |
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printf("Consistent %-30s ", clockstring(clockid)); |
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if (consistency_test(clockid, runtime)) |
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return ksft_exit_fail(); |
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} |
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} |
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return ksft_exit_pass(); |
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}
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