379 строки
9.0 KiB
C
379 строки
9.0 KiB
C
/* Leap second stress test
|
|
* by: John Stultz (john.stultz@linaro.org)
|
|
* (C) Copyright IBM 2012
|
|
* (C) Copyright 2013, 2015 Linaro Limited
|
|
* Licensed under the GPLv2
|
|
*
|
|
* This test signals the kernel to insert a leap second
|
|
* every day at midnight GMT. This allows for stessing the
|
|
* kernel's leap-second behavior, as well as how well applications
|
|
* handle the leap-second discontinuity.
|
|
*
|
|
* Usage: leap-a-day [-s] [-i <num>]
|
|
*
|
|
* Options:
|
|
* -s: Each iteration, set the date to 10 seconds before midnight GMT.
|
|
* This speeds up the number of leapsecond transitions tested,
|
|
* but because it calls settimeofday frequently, advancing the
|
|
* time by 24 hours every ~16 seconds, it may cause application
|
|
* disruption.
|
|
*
|
|
* -i: Number of iterations to run (default: infinite)
|
|
*
|
|
* Other notes: Disabling NTP prior to running this is advised, as the two
|
|
* may conflict in their commands to the kernel.
|
|
*
|
|
* To build:
|
|
* $ gcc leap-a-day.c -o leap-a-day -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 <stdlib.h>
|
|
#include <time.h>
|
|
#include <sys/time.h>
|
|
#include <sys/timex.h>
|
|
#include <sys/errno.h>
|
|
#include <string.h>
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
#include "../kselftest.h"
|
|
|
|
#define NSEC_PER_SEC 1000000000ULL
|
|
#define CLOCK_TAI 11
|
|
|
|
time_t next_leap;
|
|
int error_found;
|
|
|
|
/* returns 1 if a <= b, 0 otherwise */
|
|
static inline int in_order(struct timespec a, struct timespec b)
|
|
{
|
|
if (a.tv_sec < b.tv_sec)
|
|
return 1;
|
|
if (a.tv_sec > b.tv_sec)
|
|
return 0;
|
|
if (a.tv_nsec > b.tv_nsec)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
struct timespec timespec_add(struct timespec ts, unsigned long long ns)
|
|
{
|
|
ts.tv_nsec += ns;
|
|
while (ts.tv_nsec >= NSEC_PER_SEC) {
|
|
ts.tv_nsec -= NSEC_PER_SEC;
|
|
ts.tv_sec++;
|
|
}
|
|
return ts;
|
|
}
|
|
|
|
char *time_state_str(int state)
|
|
{
|
|
switch (state) {
|
|
case TIME_OK: return "TIME_OK";
|
|
case TIME_INS: return "TIME_INS";
|
|
case TIME_DEL: return "TIME_DEL";
|
|
case TIME_OOP: return "TIME_OOP";
|
|
case TIME_WAIT: return "TIME_WAIT";
|
|
case TIME_BAD: return "TIME_BAD";
|
|
}
|
|
return "ERROR";
|
|
}
|
|
|
|
/* clear NTP time_status & time_state */
|
|
int clear_time_state(void)
|
|
{
|
|
struct timex tx;
|
|
int ret;
|
|
|
|
/*
|
|
* We have to call adjtime twice here, as kernels
|
|
* prior to 6b1859dba01c7 (included in 3.5 and
|
|
* -stable), had an issue with the state machine
|
|
* and wouldn't clear the STA_INS/DEL flag directly.
|
|
*/
|
|
tx.modes = ADJ_STATUS;
|
|
tx.status = STA_PLL;
|
|
ret = adjtimex(&tx);
|
|
|
|
/* Clear maxerror, as it can cause UNSYNC to be set */
|
|
tx.modes = ADJ_MAXERROR;
|
|
tx.maxerror = 0;
|
|
ret = adjtimex(&tx);
|
|
|
|
/* Clear the status */
|
|
tx.modes = ADJ_STATUS;
|
|
tx.status = 0;
|
|
ret = adjtimex(&tx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Make sure we cleanup on ctrl-c */
|
|
void handler(int unused)
|
|
{
|
|
clear_time_state();
|
|
exit(0);
|
|
}
|
|
|
|
void sigalarm(int signo)
|
|
{
|
|
struct timex tx;
|
|
int ret;
|
|
|
|
tx.modes = 0;
|
|
ret = adjtimex(&tx);
|
|
|
|
if (tx.time.tv_sec < next_leap) {
|
|
printf("Error: Early timer expiration! (Should be %ld)\n", next_leap);
|
|
error_found = 1;
|
|
printf("adjtimex: %10ld sec + %6ld us (%i)\t%s\n",
|
|
tx.time.tv_sec,
|
|
tx.time.tv_usec,
|
|
tx.tai,
|
|
time_state_str(ret));
|
|
}
|
|
if (ret != TIME_WAIT) {
|
|
printf("Error: Timer seeing incorrect NTP state? (Should be TIME_WAIT)\n");
|
|
error_found = 1;
|
|
printf("adjtimex: %10ld sec + %6ld us (%i)\t%s\n",
|
|
tx.time.tv_sec,
|
|
tx.time.tv_usec,
|
|
tx.tai,
|
|
time_state_str(ret));
|
|
}
|
|
}
|
|
|
|
|
|
/* Test for known hrtimer failure */
|
|
void test_hrtimer_failure(void)
|
|
{
|
|
struct timespec now, target;
|
|
|
|
clock_gettime(CLOCK_REALTIME, &now);
|
|
target = timespec_add(now, NSEC_PER_SEC/2);
|
|
clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, &target, NULL);
|
|
clock_gettime(CLOCK_REALTIME, &now);
|
|
|
|
if (!in_order(target, now)) {
|
|
printf("ERROR: hrtimer early expiration failure observed.\n");
|
|
error_found = 1;
|
|
}
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
timer_t tm1;
|
|
struct itimerspec its1;
|
|
struct sigevent se;
|
|
struct sigaction act;
|
|
int signum = SIGRTMAX;
|
|
int settime = 1;
|
|
int tai_time = 0;
|
|
int insert = 1;
|
|
int iterations = 10;
|
|
int opt;
|
|
|
|
/* Process arguments */
|
|
while ((opt = getopt(argc, argv, "sti:")) != -1) {
|
|
switch (opt) {
|
|
case 'w':
|
|
printf("Only setting leap-flag, not changing time. It could take up to a day for leap to trigger.\n");
|
|
settime = 0;
|
|
break;
|
|
case 'i':
|
|
iterations = atoi(optarg);
|
|
break;
|
|
case 't':
|
|
tai_time = 1;
|
|
break;
|
|
default:
|
|
printf("Usage: %s [-w] [-i <iterations>]\n", argv[0]);
|
|
printf(" -w: Set flag and wait for leap second each iteration");
|
|
printf(" (default sets time to right before leapsecond)\n");
|
|
printf(" -i: Number of iterations (-1 = infinite, default is 10)\n");
|
|
printf(" -t: Print TAI time\n");
|
|
exit(-1);
|
|
}
|
|
}
|
|
|
|
/* Make sure TAI support is present if -t was used */
|
|
if (tai_time) {
|
|
struct timespec ts;
|
|
|
|
if (clock_gettime(CLOCK_TAI, &ts)) {
|
|
printf("System doesn't support CLOCK_TAI\n");
|
|
ksft_exit_fail();
|
|
}
|
|
}
|
|
|
|
signal(SIGINT, handler);
|
|
signal(SIGKILL, handler);
|
|
|
|
/* Set up timer signal handler: */
|
|
sigfillset(&act.sa_mask);
|
|
act.sa_flags = 0;
|
|
act.sa_handler = sigalarm;
|
|
sigaction(signum, &act, NULL);
|
|
|
|
if (iterations < 0)
|
|
printf("This runs continuously. Press ctrl-c to stop\n");
|
|
else
|
|
printf("Running for %i iterations. Press ctrl-c to stop\n", iterations);
|
|
|
|
printf("\n");
|
|
while (1) {
|
|
int ret;
|
|
struct timespec ts;
|
|
struct timex tx;
|
|
time_t now;
|
|
|
|
/* Get the current time */
|
|
clock_gettime(CLOCK_REALTIME, &ts);
|
|
|
|
/* Calculate the next possible leap second 23:59:60 GMT */
|
|
next_leap = ts.tv_sec;
|
|
next_leap += 86400 - (next_leap % 86400);
|
|
|
|
if (settime) {
|
|
struct timeval tv;
|
|
|
|
tv.tv_sec = next_leap - 10;
|
|
tv.tv_usec = 0;
|
|
settimeofday(&tv, NULL);
|
|
printf("Setting time to %s", ctime(&tv.tv_sec));
|
|
}
|
|
|
|
/* Reset NTP time state */
|
|
clear_time_state();
|
|
|
|
/* Set the leap second insert flag */
|
|
tx.modes = ADJ_STATUS;
|
|
if (insert)
|
|
tx.status = STA_INS;
|
|
else
|
|
tx.status = STA_DEL;
|
|
ret = adjtimex(&tx);
|
|
if (ret < 0) {
|
|
printf("Error: Problem setting STA_INS/STA_DEL!: %s\n",
|
|
time_state_str(ret));
|
|
return ksft_exit_fail();
|
|
}
|
|
|
|
/* Validate STA_INS was set */
|
|
tx.modes = 0;
|
|
ret = adjtimex(&tx);
|
|
if (tx.status != STA_INS && tx.status != STA_DEL) {
|
|
printf("Error: STA_INS/STA_DEL not set!: %s\n",
|
|
time_state_str(ret));
|
|
return ksft_exit_fail();
|
|
}
|
|
|
|
if (tai_time) {
|
|
printf("Using TAI time,"
|
|
" no inconsistencies should be seen!\n");
|
|
}
|
|
|
|
printf("Scheduling leap second for %s", ctime(&next_leap));
|
|
|
|
/* Set up timer */
|
|
printf("Setting timer for %ld - %s", next_leap, ctime(&next_leap));
|
|
memset(&se, 0, sizeof(se));
|
|
se.sigev_notify = SIGEV_SIGNAL;
|
|
se.sigev_signo = signum;
|
|
se.sigev_value.sival_int = 0;
|
|
if (timer_create(CLOCK_REALTIME, &se, &tm1) == -1) {
|
|
printf("Error: timer_create failed\n");
|
|
return ksft_exit_fail();
|
|
}
|
|
its1.it_value.tv_sec = next_leap;
|
|
its1.it_value.tv_nsec = 0;
|
|
its1.it_interval.tv_sec = 0;
|
|
its1.it_interval.tv_nsec = 0;
|
|
timer_settime(tm1, TIMER_ABSTIME, &its1, NULL);
|
|
|
|
/* Wake up 3 seconds before leap */
|
|
ts.tv_sec = next_leap - 3;
|
|
ts.tv_nsec = 0;
|
|
|
|
|
|
while (clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, &ts, NULL))
|
|
printf("Something woke us up, returning to sleep\n");
|
|
|
|
/* Validate STA_INS is still set */
|
|
tx.modes = 0;
|
|
ret = adjtimex(&tx);
|
|
if (tx.status != STA_INS && tx.status != STA_DEL) {
|
|
printf("Something cleared STA_INS/STA_DEL, setting it again.\n");
|
|
tx.modes = ADJ_STATUS;
|
|
if (insert)
|
|
tx.status = STA_INS;
|
|
else
|
|
tx.status = STA_DEL;
|
|
ret = adjtimex(&tx);
|
|
}
|
|
|
|
/* Check adjtimex output every half second */
|
|
now = tx.time.tv_sec;
|
|
while (now < next_leap + 2) {
|
|
char buf[26];
|
|
struct timespec tai;
|
|
int ret;
|
|
|
|
tx.modes = 0;
|
|
ret = adjtimex(&tx);
|
|
|
|
if (tai_time) {
|
|
clock_gettime(CLOCK_TAI, &tai);
|
|
printf("%ld sec, %9ld ns\t%s\n",
|
|
tai.tv_sec,
|
|
tai.tv_nsec,
|
|
time_state_str(ret));
|
|
} else {
|
|
ctime_r(&tx.time.tv_sec, buf);
|
|
buf[strlen(buf)-1] = 0; /*remove trailing\n */
|
|
|
|
printf("%s + %6ld us (%i)\t%s\n",
|
|
buf,
|
|
tx.time.tv_usec,
|
|
tx.tai,
|
|
time_state_str(ret));
|
|
}
|
|
now = tx.time.tv_sec;
|
|
/* Sleep for another half second */
|
|
ts.tv_sec = 0;
|
|
ts.tv_nsec = NSEC_PER_SEC / 2;
|
|
clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL);
|
|
}
|
|
/* Switch to using other mode */
|
|
insert = !insert;
|
|
|
|
/* Note if kernel has known hrtimer failure */
|
|
test_hrtimer_failure();
|
|
|
|
printf("Leap complete\n");
|
|
if (error_found) {
|
|
printf("Errors observed\n");
|
|
clear_time_state();
|
|
return ksft_exit_fail();
|
|
}
|
|
printf("\n");
|
|
if ((iterations != -1) && !(--iterations))
|
|
break;
|
|
}
|
|
|
|
clear_time_state();
|
|
return ksft_exit_pass();
|
|
}
|