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b7ecce6800
Global variables do not need to be initialized to 0 and checkpatch flags this error in tools/testing/selftests/timers/alarmtimer-suspend.c: ERROR: do not initialise globals to 0 +int final_ret = 0; Fix this checkpatch error. Signed-off-by: Zan Aziz <zanaziz313@gmail.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
179 lines
4.3 KiB
C
179 lines
4.3 KiB
C
/* alarmtimer suspend test
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* John Stultz (john.stultz@linaro.org)
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* (C) Copyright Linaro 2013
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* Licensed under the GPLv2
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*
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* This test makes sure the alarmtimer & RTC wakeup code is
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* functioning.
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*
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* To build:
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* $ gcc alarmtimer-suspend.c -o alarmtimer-suspend -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 <time.h>
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#include <string.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include "../kselftest.h"
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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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#define NSEC_PER_SEC 1000000000ULL
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#define UNREASONABLE_LAT (NSEC_PER_SEC * 5) /* hopefully we resume in 5 secs */
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#define SUSPEND_SECS 15
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int alarmcount;
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int alarm_clock_id;
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struct timespec start_time;
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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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long long timespec_sub(struct timespec a, struct timespec b)
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{
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long long ret = NSEC_PER_SEC * b.tv_sec + b.tv_nsec;
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ret -= NSEC_PER_SEC * a.tv_sec + a.tv_nsec;
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return ret;
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}
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int final_ret;
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void sigalarm(int signo)
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{
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long long delta_ns;
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struct timespec ts;
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clock_gettime(alarm_clock_id, &ts);
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alarmcount++;
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delta_ns = timespec_sub(start_time, ts);
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delta_ns -= NSEC_PER_SEC * SUSPEND_SECS * alarmcount;
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printf("ALARM(%i): %ld:%ld latency: %lld ns ", alarmcount, ts.tv_sec,
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ts.tv_nsec, delta_ns);
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if (delta_ns > UNREASONABLE_LAT) {
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printf("[FAIL]\n");
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final_ret = -1;
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} else
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printf("[OK]\n");
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}
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int main(void)
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{
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timer_t tm1;
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struct itimerspec its1, its2;
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struct sigevent se;
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struct sigaction act;
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int signum = SIGRTMAX;
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/* Set up signal handler: */
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sigfillset(&act.sa_mask);
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act.sa_flags = 0;
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act.sa_handler = sigalarm;
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sigaction(signum, &act, NULL);
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/* Set up timer: */
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memset(&se, 0, sizeof(se));
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se.sigev_notify = SIGEV_SIGNAL;
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se.sigev_signo = signum;
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se.sigev_value.sival_int = 0;
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for (alarm_clock_id = CLOCK_REALTIME_ALARM;
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alarm_clock_id <= CLOCK_BOOTTIME_ALARM;
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alarm_clock_id++) {
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alarmcount = 0;
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if (timer_create(alarm_clock_id, &se, &tm1) == -1) {
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printf("timer_create failed, %s unsupported?\n",
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clockstring(alarm_clock_id));
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break;
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}
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clock_gettime(alarm_clock_id, &start_time);
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printf("Start time (%s): %ld:%ld\n", clockstring(alarm_clock_id),
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start_time.tv_sec, start_time.tv_nsec);
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printf("Setting alarm for every %i seconds\n", SUSPEND_SECS);
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its1.it_value = start_time;
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its1.it_value.tv_sec += SUSPEND_SECS;
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its1.it_interval.tv_sec = SUSPEND_SECS;
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its1.it_interval.tv_nsec = 0;
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timer_settime(tm1, TIMER_ABSTIME, &its1, &its2);
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while (alarmcount < 5)
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sleep(1); /* First 5 alarms, do nothing */
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printf("Starting suspend loops\n");
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while (alarmcount < 10) {
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int ret;
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sleep(3);
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ret = system("echo mem > /sys/power/state");
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if (ret)
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break;
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}
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timer_delete(tm1);
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}
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if (final_ret)
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return ksft_exit_fail();
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return ksft_exit_pass();
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}
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