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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <getopt.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/epoll.h>
#include <sys/timerfd.h>
#include <cutils/klog.h>
#define NSEC_PER_SEC (1000*1000*1000)
#define MSEC_PER_SEC 1000
#define NSEC_PER_MSEC (NSEC_PER_SEC/MSEC_PER_SEC)
long long timediff_ns(const struct timespec *a, const struct timespec *b) {
return ((long long)(a->tv_sec - b->tv_sec)) * NSEC_PER_SEC +
(a->tv_nsec - b->tv_nsec);
}
void usage(void)
{
printf("usage: suspend_stress [ <options> ]\n"
"options:\n"
" -a,--abort abort test on late alarm\n"
" -c,--count=<count> number of times to suspend (default infinite)\n"
" -t,--time=<seconds> time to suspend for (default 5)\n"
);
}
int main(int argc, char **argv)
{
int alarm_time = 5;
int count = -1;
bool abort_on_failure = false;
while (1) {
const static struct option long_options[] = {
{"abort", no_argument, 0, 'a'},
{"count", required_argument, 0, 'c'},
{"time", required_argument, 0, 't'},
};
int c = getopt_long(argc, argv, "ac:t:", long_options, NULL);
if (c < 0) {
break;
}
switch (c) {
case 'a':
abort_on_failure = true;
break;
case 'c':
count = strtoul(optarg, NULL, 0);
break;
case 't':
alarm_time = strtoul(optarg, NULL, 0);
break;
case '?':
usage();
exit(EXIT_FAILURE);
default:
abort();
}
}
klog_set_level(KLOG_INFO_LEVEL);
if (optind < argc) {
fprintf(stderr, "Unexpected argument: %s\n", argv[optind]);
usage();
exit(EXIT_FAILURE);
}
int fd = timerfd_create(CLOCK_BOOTTIME_ALARM, 0);
if (fd < 0) {
perror("timerfd_create failed");
exit(EXIT_FAILURE);
}
struct itimerspec delay = itimerspec();
delay.it_value.tv_sec = alarm_time;
int i = 0;
int epoll_fd = epoll_create(1);
if (epoll_fd < 0) {
perror("epoll_create failed");
exit(EXIT_FAILURE);
}
struct epoll_event ev = epoll_event();
ev.events = EPOLLIN | EPOLLWAKEUP;
int ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev);
if (ret < 0) {
perror("epoll_ctl failed");
exit(EXIT_FAILURE);
}
while (count != 0) {
struct timespec expected_time;
struct timespec actual_time;
uint64_t fired = 0;
ret = timerfd_settime(fd, 0, &delay, NULL);
if (ret < 0) {
perror("timerfd_settime failed");
exit(EXIT_FAILURE);
}
ret = clock_gettime(CLOCK_BOOTTIME, &expected_time);
if (ret < 0) {
perror("failed to get time");
exit(EXIT_FAILURE);
}
expected_time.tv_sec += alarm_time;
ret = 0;
while (ret != 1) {
struct epoll_event out_ev;
ret = epoll_wait(epoll_fd, &out_ev, 1, -1);
if (ret < 0 && errno != EINTR) {
perror("epoll_wait failed");
exit(EXIT_FAILURE);
}
}
ssize_t bytes = read(fd, &fired, sizeof(fired));
if (bytes < 0) {
perror("read from timer fd failed");
exit(EXIT_FAILURE);
} else if (bytes < (ssize_t)sizeof(fired)) {
fprintf(stderr, "unexpected read from timer fd: %zd\n", bytes);
}
if (fired != 1) {
fprintf(stderr, "unexpected timer fd fired count: %" PRIu64 "\n", fired);
}
ret = clock_gettime(CLOCK_BOOTTIME, &actual_time);
if (ret < 0) {
perror("failed to get time");
exit(EXIT_FAILURE);
}
long long diff = timediff_ns(&actual_time, &expected_time);
if (llabs(diff) > NSEC_PER_SEC) {
fprintf(stderr, "alarm arrived %lld.%03lld seconds %s\n",
llabs(diff) / NSEC_PER_SEC,
(llabs(diff) / NSEC_PER_MSEC) % MSEC_PER_SEC,
diff > 0 ? "late" : "early");
KLOG_ERROR("suspend_stress", "alarm arrived %lld.%03lld seconds %s\n",
llabs(diff) / NSEC_PER_SEC,
(llabs(diff) / NSEC_PER_MSEC) % MSEC_PER_SEC,
diff > 0 ? "late" : "early");
if (abort_on_failure) {
exit(EXIT_FAILURE);
}
}
time_t t = time(NULL);
i += fired;
printf("timer fired: %d at boottime %lld.%.3ld, %s", i,
(long long)actual_time.tv_sec,
actual_time.tv_nsec / NSEC_PER_MSEC,
ctime(&t));
KLOG_INFO("suspend_stress", "timer fired: %d at boottime %lld.%.3ld, %s", i,
(long long)actual_time.tv_sec,
actual_time.tv_nsec / NSEC_PER_MSEC,
ctime(&t));
if (count > 0)
count--;
}
return 0;
}
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