1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <errno.h>
18 #include <getopt.h>
19 #include <inttypes.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <time.h>
24 #include <unistd.h>
25
26 #include <sys/epoll.h>
27 #include <sys/timerfd.h>
28
29 #include <cutils/klog.h>
30
31 #define NSEC_PER_SEC (1000*1000*1000)
32 #define MSEC_PER_SEC 1000
33 #define NSEC_PER_MSEC (NSEC_PER_SEC/MSEC_PER_SEC)
34
timediff_ns(const struct timespec * a,const struct timespec * b)35 long long timediff_ns(const struct timespec *a, const struct timespec *b) {
36 return ((long long)(a->tv_sec - b->tv_sec)) * NSEC_PER_SEC +
37 (a->tv_nsec - b->tv_nsec);
38 }
39
usage(void)40 void usage(void)
41 {
42 printf("usage: suspend_stress [ <options> ]\n"
43 "options:\n"
44 " -a,--abort abort test on late alarm\n"
45 " -c,--count=<count> number of times to suspend (default infinite)\n"
46 " -t,--time=<seconds> time to suspend for (default 5)\n"
47 );
48 }
49
main(int argc,char ** argv)50 int main(int argc, char **argv)
51 {
52 int alarm_time = 5;
53 int count = -1;
54 bool abort_on_failure = false;
55
56 while (1) {
57 const static struct option long_options[] = {
58 {"abort", no_argument, 0, 'a'},
59 {"count", required_argument, 0, 'c'},
60 {"time", required_argument, 0, 't'},
61 };
62 int c = getopt_long(argc, argv, "ac:t:", long_options, NULL);
63 if (c < 0) {
64 break;
65 }
66
67 switch (c) {
68 case 'a':
69 abort_on_failure = true;
70 break;
71 case 'c':
72 count = strtoul(optarg, NULL, 0);
73 break;
74 case 't':
75 alarm_time = strtoul(optarg, NULL, 0);
76 break;
77 case '?':
78 usage();
79 exit(EXIT_FAILURE);
80 default:
81 abort();
82 }
83 }
84
85 klog_set_level(KLOG_INFO_LEVEL);
86
87 if (optind < argc) {
88 fprintf(stderr, "Unexpected argument: %s\n", argv[optind]);
89 usage();
90 exit(EXIT_FAILURE);
91 }
92
93 int fd = timerfd_create(CLOCK_BOOTTIME_ALARM, 0);
94 if (fd < 0) {
95 perror("timerfd_create failed");
96 exit(EXIT_FAILURE);
97 }
98
99 struct itimerspec delay = itimerspec();
100 delay.it_value.tv_sec = alarm_time;
101 int i = 0;
102
103 int epoll_fd = epoll_create(1);
104 if (epoll_fd < 0) {
105 perror("epoll_create failed");
106 exit(EXIT_FAILURE);
107 }
108
109 struct epoll_event ev = epoll_event();
110 ev.events = EPOLLIN | EPOLLWAKEUP;
111 int ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev);
112 if (ret < 0) {
113 perror("epoll_ctl failed");
114 exit(EXIT_FAILURE);
115 }
116
117 while (count != 0) {
118 struct timespec expected_time;
119 struct timespec actual_time;
120 uint64_t fired = 0;
121
122 ret = timerfd_settime(fd, 0, &delay, NULL);
123 if (ret < 0) {
124 perror("timerfd_settime failed");
125 exit(EXIT_FAILURE);
126 }
127
128 ret = clock_gettime(CLOCK_BOOTTIME, &expected_time);
129 if (ret < 0) {
130 perror("failed to get time");
131 exit(EXIT_FAILURE);
132 }
133 expected_time.tv_sec += alarm_time;
134
135 ret = 0;
136 while (ret != 1) {
137 struct epoll_event out_ev;
138 ret = epoll_wait(epoll_fd, &out_ev, 1, -1);
139 if (ret < 0 && errno != EINTR) {
140 perror("epoll_wait failed");
141 exit(EXIT_FAILURE);
142 }
143 }
144
145 ssize_t bytes = read(fd, &fired, sizeof(fired));
146 if (bytes < 0) {
147 perror("read from timer fd failed");
148 exit(EXIT_FAILURE);
149 } else if (bytes < (ssize_t)sizeof(fired)) {
150 fprintf(stderr, "unexpected read from timer fd: %zd\n", bytes);
151 }
152
153 if (fired != 1) {
154 fprintf(stderr, "unexpected timer fd fired count: %" PRIu64 "\n", fired);
155 }
156
157 ret = clock_gettime(CLOCK_BOOTTIME, &actual_time);
158 if (ret < 0) {
159 perror("failed to get time");
160 exit(EXIT_FAILURE);
161 }
162
163 long long diff = timediff_ns(&actual_time, &expected_time);
164 if (llabs(diff) > NSEC_PER_SEC) {
165 fprintf(stderr, "alarm arrived %lld.%03lld seconds %s\n",
166 llabs(diff) / NSEC_PER_SEC,
167 (llabs(diff) / NSEC_PER_MSEC) % MSEC_PER_SEC,
168 diff > 0 ? "late" : "early");
169 KLOG_ERROR("suspend_stress", "alarm arrived %lld.%03lld seconds %s\n",
170 llabs(diff) / NSEC_PER_SEC,
171 (llabs(diff) / NSEC_PER_MSEC) % MSEC_PER_SEC,
172 diff > 0 ? "late" : "early");
173 if (abort_on_failure) {
174 exit(EXIT_FAILURE);
175 }
176 }
177
178 time_t t = time(NULL);
179 i += fired;
180 printf("timer fired: %d at boottime %lld.%.3ld, %s", i,
181 (long long)actual_time.tv_sec,
182 actual_time.tv_nsec / NSEC_PER_MSEC,
183 ctime(&t));
184
185 KLOG_INFO("suspend_stress", "timer fired: %d at boottime %lld.%.3ld, %s", i,
186 (long long)actual_time.tv_sec,
187 actual_time.tv_nsec / NSEC_PER_MSEC,
188 ctime(&t));
189
190 if (count > 0)
191 count--;
192 }
193 return 0;
194 }
195