projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 689f32fb JS |
1 | /* Make sure timers don't return early |
| 2 | * by: john stultz (johnstul@us.ibm.com) | |
| 3 | * John Stultz (john.stultz@linaro.org) | |
| 4 | * (C) Copyright IBM 2012 | |
| 5 | * (C) Copyright Linaro 2013 2015 | |
| 6 | * Licensed under the GPLv2 | |
| 7 | * | |
| 8 | * To build: | |
| 9 | * $ gcc nanosleep.c -o nanosleep -lrt | |
| 10 | * | |
| 11 | * This program is free software: you can redistribute it and/or modify | |
| 12 | * it under the terms of the GNU General Public License as published by | |
| 13 | * the Free Software Foundation, either version 2 of the License, or | |
| 14 | * (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 of | |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 19 | * GNU General Public License for more details. | |
| 20 | */ | |
| 21 | ||
| c1ee4831 | 22 | #include <errno.h> |
| 689f32fb JS |
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 | #ifdef KTEST | |
| 31 | #include "../kselftest.h" | |
| 32 | #else | |
| 33 | static inline int ksft_exit_pass(void) | |
| 34 | { | |
| 35 | exit(0); | |
| 36 | } | |
| 37 | static inline int ksft_exit_fail(void) | |
| 38 | { | |
| 39 | exit(1); | |
| 40 | } | |
| 41 | #endif | |
| 42 | ||
| 43 | #define NSEC_PER_SEC 1000000000ULL | |
| 44 | ||
| 45 | #define CLOCK_REALTIME 0 | |
| 46 | #define CLOCK_MONOTONIC 1 | |
| 47 | #define CLOCK_PROCESS_CPUTIME_ID 2 | |
| 48 | #define CLOCK_THREAD_CPUTIME_ID 3 | |
| 49 | #define CLOCK_MONOTONIC_RAW 4 | |
| 50 | #define CLOCK_REALTIME_COARSE 5 | |
| 51 | #define CLOCK_MONOTONIC_COARSE 6 | |
| 52 | #define CLOCK_BOOTTIME 7 | |
| 53 | #define CLOCK_REALTIME_ALARM 8 | |
| 54 | #define CLOCK_BOOTTIME_ALARM 9 | |
| 55 | #define CLOCK_HWSPECIFIC 10 | |
| 56 | #define CLOCK_TAI 11 | |
| 57 | #define NR_CLOCKIDS 12 | |
| 58 | ||
| 59 | #define UNSUPPORTED 0xf00f | |
| 60 | ||
| 61 | char *clockstring(int clockid) | |
| 62 | { | |
| 63 | switch (clockid) { | |
| 64 | case CLOCK_REALTIME: | |
| 65 | return "CLOCK_REALTIME"; | |
| 66 | case CLOCK_MONOTONIC: | |
| 67 | return "CLOCK_MONOTONIC"; | |
| 68 | case CLOCK_PROCESS_CPUTIME_ID: | |
| 69 | return "CLOCK_PROCESS_CPUTIME_ID"; | |
| 70 | case CLOCK_THREAD_CPUTIME_ID: | |
| 71 | return "CLOCK_THREAD_CPUTIME_ID"; | |
| 72 | case CLOCK_MONOTONIC_RAW: | |
| 73 | return "CLOCK_MONOTONIC_RAW"; | |
| 74 | case CLOCK_REALTIME_COARSE: | |
| 75 | return "CLOCK_REALTIME_COARSE"; | |
| 76 | case CLOCK_MONOTONIC_COARSE: | |
| 77 | return "CLOCK_MONOTONIC_COARSE"; | |
| 78 | case CLOCK_BOOTTIME: | |
| 79 | return "CLOCK_BOOTTIME"; | |
| 80 | case CLOCK_REALTIME_ALARM: | |
| 81 | return "CLOCK_REALTIME_ALARM"; | |
| 82 | case CLOCK_BOOTTIME_ALARM: | |
| 83 | return "CLOCK_BOOTTIME_ALARM"; | |
| 84 | case CLOCK_TAI: | |
| 85 | return "CLOCK_TAI"; | |
| 86 | }; | |
| 87 | return "UNKNOWN_CLOCKID"; | |
| 88 | } | |
| 89 | ||
| 90 | /* returns 1 if a <= b, 0 otherwise */ | |
| 91 | static inline int in_order(struct timespec a, struct timespec b) | |
| 92 | { | |
| 93 | if (a.tv_sec < b.tv_sec) | |
| 94 | return 1; | |
| 95 | if (a.tv_sec > b.tv_sec) | |
| 96 | return 0; | |
| 97 | if (a.tv_nsec > b.tv_nsec) | |
| 98 | return 0; | |
| 99 | return 1; | |
| 100 | } | |
| 101 | ||
| 102 | struct timespec timespec_add(struct timespec ts, unsigned long long ns) | |
| 103 | { | |
| 104 | ts.tv_nsec += ns; | |
| 105 | while (ts.tv_nsec >= NSEC_PER_SEC) { | |
| 106 | ts.tv_nsec -= NSEC_PER_SEC; | |
| 107 | ts.tv_sec++; | |
| 108 | } | |
| 109 | return ts; | |
| 110 | } | |
| 111 | ||
| 112 | int nanosleep_test(int clockid, long long ns) | |
| 113 | { | |
| 114 | struct timespec now, target, rel; | |
| 115 | ||
| 116 | /* First check abs time */ | |
| 117 | if (clock_gettime(clockid, &now)) | |
| 118 | return UNSUPPORTED; | |
| 119 | target = timespec_add(now, ns); | |
| 120 | ||
| 121 | if (clock_nanosleep(clockid, TIMER_ABSTIME, &target, NULL)) | |
| 122 | return UNSUPPORTED; | |
| 123 | clock_gettime(clockid, &now); | |
| 124 | ||
| 125 | if (!in_order(target, now)) | |
| 126 | return -1; | |
| 127 | ||
| 128 | /* Second check reltime */ | |
| 129 | clock_gettime(clockid, &now); | |
| 130 | rel.tv_sec = 0; | |
| 131 | rel.tv_nsec = 0; | |
| 132 | rel = timespec_add(rel, ns); | |
| 133 | target = timespec_add(now, ns); | |
| 134 | clock_nanosleep(clockid, 0, &rel, NULL); | |
| 135 | clock_gettime(clockid, &now); | |
| 136 | ||
| 137 | if (!in_order(target, now)) | |
| 138 | return -1; | |
| 139 | return 0; | |
| 140 | } | |
| 141 | ||
| 142 | int main(int argc, char **argv) | |
| 143 | { | |
| 144 | long long length; | |
| 145 | int clockid, ret; | |
| 146 | ||
| 147 | for (clockid = CLOCK_REALTIME; clockid < NR_CLOCKIDS; clockid++) { | |
| 148 | ||
| 149 | /* Skip cputime clockids since nanosleep won't increment cputime */ | |
| 150 | if (clockid == CLOCK_PROCESS_CPUTIME_ID || | |
| 151 | clockid == CLOCK_THREAD_CPUTIME_ID || | |
| 152 | clockid == CLOCK_HWSPECIFIC) | |
| 153 | continue; | |
| 154 | ||
| 155 | printf("Nanosleep %-31s ", clockstring(clockid)); | |
| 156 | ||
| 157 | length = 10; | |
| 158 | while (length <= (NSEC_PER_SEC * 10)) { | |
| 159 | ret = nanosleep_test(clockid, length); | |
| 160 | if (ret == UNSUPPORTED) { | |
| 161 | printf("[UNSUPPORTED]\n"); | |
| 162 | goto next; | |
| 163 | } | |
| 164 | if (ret < 0) { | |
| 165 | printf("[FAILED]\n"); | |
| 166 | return ksft_exit_fail(); | |
| 167 | } | |
| 168 | length *= 100; | |
| 169 | } | |
| 170 | printf("[OK]\n"); | |
| 171 | next: | |
| 172 | ret = 0; | |
| 173 | } | |
| 174 | return ksft_exit_pass(); | |
| 175 | } |