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