--- /dev/null
+/*
+ * 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 <getopt.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.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_init();
+ 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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