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/* alarmtimer suspend test
* John Stultz (john.stultz@linaro.org)
* (C) Copyright Linaro 2013
* Licensed under the GPLv2
*
* This test makes sure the alarmtimer & RTC wakeup code is
* functioning.
*
* To build:
* $ gcc alarmtimer-suspend.c -o alarmtimer-suspend -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 <time.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include <pthread.h>
#include "../kselftest.h"
#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
#define NSEC_PER_SEC 1000000000ULL
#define UNREASONABLE_LAT (NSEC_PER_SEC * 5) /* hopefully we resume in 5 secs */
#define SUSPEND_SECS 15
int alarmcount;
int alarm_clock_id;
struct timespec start_time;
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";
}
long long timespec_sub(struct timespec a, struct timespec b)
{
long long ret = NSEC_PER_SEC * b.tv_sec + b.tv_nsec;
ret -= NSEC_PER_SEC * a.tv_sec + a.tv_nsec;
return ret;
}
int final_ret;
void sigalarm(int signo)
{
long long delta_ns;
struct timespec ts;
clock_gettime(alarm_clock_id, &ts);
alarmcount++;
delta_ns = timespec_sub(start_time, ts);
delta_ns -= NSEC_PER_SEC * SUSPEND_SECS * alarmcount;
printf("ALARM(%i): %ld:%ld latency: %lld ns ", alarmcount, ts.tv_sec,
ts.tv_nsec, delta_ns);
if (delta_ns > UNREASONABLE_LAT) {
printf("[FAIL]\n");
final_ret = -1;
} else
printf("[OK]\n");
}
int main(void)
{
timer_t tm1;
struct itimerspec its1, its2;
struct sigevent se;
struct sigaction act;
int signum = SIGRTMAX;
/* Set up signal handler: */
sigfillset(&act.sa_mask);
act.sa_flags = 0;
act.sa_handler = sigalarm;
sigaction(signum, &act, NULL);
/* Set up timer: */
memset(&se, 0, sizeof(se));
se.sigev_notify = SIGEV_SIGNAL;
se.sigev_signo = signum;
se.sigev_value.sival_int = 0;
for (alarm_clock_id = CLOCK_REALTIME_ALARM;
alarm_clock_id <= CLOCK_BOOTTIME_ALARM;
alarm_clock_id++) {
alarmcount = 0;
if (timer_create(alarm_clock_id, &se, &tm1) == -1) {
printf("timer_create failed, %s unsupported?\n",
clockstring(alarm_clock_id));
break;
}
clock_gettime(alarm_clock_id, &start_time);
printf("Start time (%s): %ld:%ld\n", clockstring(alarm_clock_id),
start_time.tv_sec, start_time.tv_nsec);
printf("Setting alarm for every %i seconds\n", SUSPEND_SECS);
its1.it_value = start_time;
its1.it_value.tv_sec += SUSPEND_SECS;
its1.it_interval.tv_sec = SUSPEND_SECS;
its1.it_interval.tv_nsec = 0;
timer_settime(tm1, TIMER_ABSTIME, &its1, &its2);
while (alarmcount < 5)
sleep(1); /* First 5 alarms, do nothing */
printf("Starting suspend loops\n");
while (alarmcount < 10) {
int ret;
sleep(3);
ret = system("echo mem > /sys/power/state");
if (ret)
break;
}
timer_delete(tm1);
}
if (final_ret)
return ksft_exit_fail();
return ksft_exit_pass();
}
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