170 lines · c
1/* Make sure timers don't return early2 * by: john stultz (johnstul@us.ibm.com)3 * John Stultz (john.stultz@linaro.org)4 * (C) Copyright IBM 20125 * (C) Copyright Linaro 2013 20156 * Licensed under the GPLv27 *8 * To build:9 * $ gcc nanosleep.c -o nanosleep -lrt10 *11 * This program is free software: you can redistribute it and/or modify12 * it under the terms of the GNU General Public License as published by13 * the Free Software Foundation, either version 2 of the License, or14 * (at your option) any later version.15 *16 * This program is distributed in the hope that it will be useful,17 * but WITHOUT ANY WARRANTY; without even the implied warranty of18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the19 * GNU General Public License for more details.20 */21 22#include <errno.h>23#include <stdio.h>24#include <stdlib.h>25#include <time.h>26#include <sys/time.h>27#include <sys/timex.h>28#include <string.h>29#include <signal.h>30#include "../kselftest.h"31 32#define NSEC_PER_SEC 1000000000ULL33 34#define CLOCK_REALTIME 035#define CLOCK_MONOTONIC 136#define CLOCK_PROCESS_CPUTIME_ID 237#define CLOCK_THREAD_CPUTIME_ID 338#define CLOCK_MONOTONIC_RAW 439#define CLOCK_REALTIME_COARSE 540#define CLOCK_MONOTONIC_COARSE 641#define CLOCK_BOOTTIME 742#define CLOCK_REALTIME_ALARM 843#define CLOCK_BOOTTIME_ALARM 944#define CLOCK_HWSPECIFIC 1045#define CLOCK_TAI 1146#define NR_CLOCKIDS 1247 48#define UNSUPPORTED 0xf00f49 50char *clockstring(int clockid)51{52 switch (clockid) {53 case CLOCK_REALTIME:54 return "CLOCK_REALTIME";55 case CLOCK_MONOTONIC:56 return "CLOCK_MONOTONIC";57 case CLOCK_PROCESS_CPUTIME_ID:58 return "CLOCK_PROCESS_CPUTIME_ID";59 case CLOCK_THREAD_CPUTIME_ID:60 return "CLOCK_THREAD_CPUTIME_ID";61 case CLOCK_MONOTONIC_RAW:62 return "CLOCK_MONOTONIC_RAW";63 case CLOCK_REALTIME_COARSE:64 return "CLOCK_REALTIME_COARSE";65 case CLOCK_MONOTONIC_COARSE:66 return "CLOCK_MONOTONIC_COARSE";67 case CLOCK_BOOTTIME:68 return "CLOCK_BOOTTIME";69 case CLOCK_REALTIME_ALARM:70 return "CLOCK_REALTIME_ALARM";71 case CLOCK_BOOTTIME_ALARM:72 return "CLOCK_BOOTTIME_ALARM";73 case CLOCK_TAI:74 return "CLOCK_TAI";75 };76 return "UNKNOWN_CLOCKID";77}78 79/* returns 1 if a <= b, 0 otherwise */80static inline int in_order(struct timespec a, struct timespec b)81{82 if (a.tv_sec < b.tv_sec)83 return 1;84 if (a.tv_sec > b.tv_sec)85 return 0;86 if (a.tv_nsec > b.tv_nsec)87 return 0;88 return 1;89}90 91struct timespec timespec_add(struct timespec ts, unsigned long long ns)92{93 ts.tv_nsec += ns;94 while (ts.tv_nsec >= NSEC_PER_SEC) {95 ts.tv_nsec -= NSEC_PER_SEC;96 ts.tv_sec++;97 }98 return ts;99}100 101int nanosleep_test(int clockid, long long ns)102{103 struct timespec now, target, rel;104 105 /* First check abs time */106 if (clock_gettime(clockid, &now))107 return UNSUPPORTED;108 target = timespec_add(now, ns);109 110 if (clock_nanosleep(clockid, TIMER_ABSTIME, &target, NULL))111 return UNSUPPORTED;112 clock_gettime(clockid, &now);113 114 if (!in_order(target, now))115 return -1;116 117 /* Second check reltime */118 clock_gettime(clockid, &now);119 rel.tv_sec = 0;120 rel.tv_nsec = 0;121 rel = timespec_add(rel, ns);122 target = timespec_add(now, ns);123 clock_nanosleep(clockid, 0, &rel, NULL);124 clock_gettime(clockid, &now);125 126 if (!in_order(target, now))127 return -1;128 return 0;129}130 131int main(int argc, char **argv)132{133 long long length;134 int clockid, ret;135 136 ksft_print_header();137 ksft_set_plan(NR_CLOCKIDS);138 139 for (clockid = CLOCK_REALTIME; clockid < NR_CLOCKIDS; clockid++) {140 141 /* Skip cputime clockids since nanosleep won't increment cputime */142 if (clockid == CLOCK_PROCESS_CPUTIME_ID ||143 clockid == CLOCK_THREAD_CPUTIME_ID ||144 clockid == CLOCK_HWSPECIFIC) {145 ksft_test_result_skip("%-31s\n", clockstring(clockid));146 continue;147 }148 149 fflush(stdout);150 151 length = 10;152 while (length <= (NSEC_PER_SEC * 10)) {153 ret = nanosleep_test(clockid, length);154 if (ret == UNSUPPORTED) {155 ksft_test_result_skip("%-31s\n", clockstring(clockid));156 goto next;157 }158 if (ret < 0) {159 ksft_test_result_fail("%-31s\n", clockstring(clockid));160 ksft_exit_fail();161 }162 length *= 100;163 }164 ksft_test_result_pass("%-31s\n", clockstring(clockid));165next:166 ret = 0;167 }168 ksft_exit_pass();169}170