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_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
