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 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 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 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_init(); 86 klog_set_level(KLOG_INFO_LEVEL); 87 88 if (optind < argc) { 89 fprintf(stderr, "Unexpected argument: %s\n", argv[optind]); 90 usage(); 91 exit(EXIT_FAILURE); 92 } 93 94 int fd = timerfd_create(CLOCK_BOOTTIME_ALARM, 0); 95 if (fd < 0) { 96 perror("timerfd_create failed"); 97 exit(EXIT_FAILURE); 98 } 99 100 struct itimerspec delay = itimerspec(); 101 delay.it_value.tv_sec = alarm_time; 102 int i = 0; 103 104 int epoll_fd = epoll_create(1); 105 if (epoll_fd < 0) { 106 perror("epoll_create failed"); 107 exit(EXIT_FAILURE); 108 } 109 110 struct epoll_event ev = epoll_event(); 111 ev.events = EPOLLIN | EPOLLWAKEUP; 112 int ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev); 113 if (ret < 0) { 114 perror("epoll_ctl failed"); 115 exit(EXIT_FAILURE); 116 } 117 118 while (count != 0) { 119 struct timespec expected_time; 120 struct timespec actual_time; 121 uint64_t fired = 0; 122 123 ret = timerfd_settime(fd, 0, &delay, NULL); 124 if (ret < 0) { 125 perror("timerfd_settime failed"); 126 exit(EXIT_FAILURE); 127 } 128 129 ret = clock_gettime(CLOCK_BOOTTIME, &expected_time); 130 if (ret < 0) { 131 perror("failed to get time"); 132 exit(EXIT_FAILURE); 133 } 134 expected_time.tv_sec += alarm_time; 135 136 ret = 0; 137 while (ret != 1) { 138 struct epoll_event out_ev; 139 ret = epoll_wait(epoll_fd, &out_ev, 1, -1); 140 if (ret < 0 && errno != EINTR) { 141 perror("epoll_wait failed"); 142 exit(EXIT_FAILURE); 143 } 144 } 145 146 ssize_t bytes = read(fd, &fired, sizeof(fired)); 147 if (bytes < 0) { 148 perror("read from timer fd failed"); 149 exit(EXIT_FAILURE); 150 } else if (bytes < (ssize_t)sizeof(fired)) { 151 fprintf(stderr, "unexpected read from timer fd: %zd\n", bytes); 152 } 153 154 if (fired != 1) { 155 fprintf(stderr, "unexpected timer fd fired count: %" PRIu64 "\n", fired); 156 } 157 158 ret = clock_gettime(CLOCK_BOOTTIME, &actual_time); 159 if (ret < 0) { 160 perror("failed to get time"); 161 exit(EXIT_FAILURE); 162 } 163 164 long long diff = timediff_ns(&actual_time, &expected_time); 165 if (llabs(diff) > NSEC_PER_SEC) { 166 fprintf(stderr, "alarm arrived %lld.%03lld seconds %s\n", 167 llabs(diff) / NSEC_PER_SEC, 168 (llabs(diff) / NSEC_PER_MSEC) % MSEC_PER_SEC, 169 diff > 0 ? "late" : "early"); 170 KLOG_ERROR("suspend_stress", "alarm arrived %lld.%03lld seconds %s\n", 171 llabs(diff) / NSEC_PER_SEC, 172 (llabs(diff) / NSEC_PER_MSEC) % MSEC_PER_SEC, 173 diff > 0 ? "late" : "early"); 174 if (abort_on_failure) { 175 exit(EXIT_FAILURE); 176 } 177 } 178 179 time_t t = time(NULL); 180 i += fired; 181 printf("timer fired: %d at boottime %lld.%.3ld, %s", i, 182 (long long)actual_time.tv_sec, 183 actual_time.tv_nsec / NSEC_PER_MSEC, 184 ctime(&t)); 185 186 KLOG_INFO("suspend_stress", "timer fired: %d at boottime %lld.%.3ld, %s", i, 187 (long long)actual_time.tv_sec, 188 actual_time.tv_nsec / NSEC_PER_MSEC, 189 ctime(&t)); 190 191 if (count > 0) 192 count--; 193 } 194 return 0; 195 } 196
