diff options
Diffstat (limited to 'tools/testing/selftests/timers/nanosleep.c')
| -rw-r--r-- | tools/testing/selftests/timers/nanosleep.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/tools/testing/selftests/timers/nanosleep.c b/tools/testing/selftests/timers/nanosleep.c new file mode 100644 index 000000000000..a054680b3372 --- /dev/null +++ b/tools/testing/selftests/timers/nanosleep.c @@ -0,0 +1,213 @@ +/* Make sure timers don't return early + * by: john stultz (johnstul@us.ibm.com) + * John Stultz (john.stultz@linaro.org) + * (C) Copyright IBM 2012 + * (C) Copyright Linaro 2013 2015 + * Licensed under the GPLv2 + * + * To build: + * $ gcc nanosleep.c -o nanosleep -lrt + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <time.h> +#include <sys/time.h> +#include <sys/timex.h> +#include <string.h> +#include <signal.h> +#include <include/vdso/time64.h> +#include "kselftest.h" + +/* CLOCK_HWSPECIFIC == CLOCK_SGI_CYCLE (Deprecated) */ +#define CLOCK_HWSPECIFIC 10 + +#define UNSUPPORTED 0xf00f + +char *clockstring(int clockid) +{ + switch (clockid) { + case CLOCK_REALTIME: + return "CLOCK_REALTIME"; + case CLOCK_MONOTONIC: + return "CLOCK_MONOTONIC"; + case CLOCK_PROCESS_CPUTIME_ID: + return "CLOCK_PROCESS_CPUTIME_ID"; + case CLOCK_THREAD_CPUTIME_ID: + return "CLOCK_THREAD_CPUTIME_ID"; + case CLOCK_MONOTONIC_RAW: + return "CLOCK_MONOTONIC_RAW"; + case CLOCK_REALTIME_COARSE: + return "CLOCK_REALTIME_COARSE"; + case CLOCK_MONOTONIC_COARSE: + return "CLOCK_MONOTONIC_COARSE"; + case CLOCK_BOOTTIME: + return "CLOCK_BOOTTIME"; + case CLOCK_REALTIME_ALARM: + return "CLOCK_REALTIME_ALARM"; + case CLOCK_BOOTTIME_ALARM: + return "CLOCK_BOOTTIME_ALARM"; + case CLOCK_TAI: + return "CLOCK_TAI"; + }; + return "UNKNOWN_CLOCKID"; +} + +/* returns 1 if a <= b, 0 otherwise */ +static inline int in_order(struct timespec a, struct timespec b) +{ + if (a.tv_sec < b.tv_sec) + return 1; + if (a.tv_sec > b.tv_sec) + return 0; + if (a.tv_nsec > b.tv_nsec) + return 0; + return 1; +} + +struct timespec timespec_add(struct timespec ts, unsigned long long ns) +{ + ts.tv_nsec += ns; + while (ts.tv_nsec >= NSEC_PER_SEC) { + ts.tv_nsec -= NSEC_PER_SEC; + ts.tv_sec++; + } + return ts; +} + +int nanosleep_test(int clockid, long long ns) +{ + struct timespec now, target, rel; + + /* First check abs time */ + if (clock_gettime(clockid, &now)) + return UNSUPPORTED; + target = timespec_add(now, ns); + + if (clock_nanosleep(clockid, TIMER_ABSTIME, &target, NULL)) + return UNSUPPORTED; + clock_gettime(clockid, &now); + + if (!in_order(target, now)) + return -1; + + /* Second check reltime */ + clock_gettime(clockid, &now); + rel.tv_sec = 0; + rel.tv_nsec = 0; + rel = timespec_add(rel, ns); + target = timespec_add(now, ns); + clock_nanosleep(clockid, 0, &rel, NULL); + clock_gettime(clockid, &now); + + if (!in_order(target, now)) + return -1; + return 0; +} + +static void dummy_event_handler(int val) +{ + /* No action needed */ +} + +static int nanosleep_test_remaining(int clockid) +{ + struct timespec rqtp = {}, rmtp = {}; + struct itimerspec itimer = {}; + struct sigaction sa = {}; + timer_t timer; + int ret; + + sa.sa_handler = dummy_event_handler; + ret = sigaction(SIGALRM, &sa, NULL); + if (ret) + return -1; + + ret = timer_create(clockid, NULL, &timer); + if (ret) + return -1; + + itimer.it_value.tv_nsec = NSEC_PER_SEC / 4; + ret = timer_settime(timer, 0, &itimer, NULL); + if (ret) + return -1; + + rqtp.tv_nsec = NSEC_PER_SEC / 2; + ret = clock_nanosleep(clockid, 0, &rqtp, &rmtp); + if (ret != EINTR) + return -1; + + ret = timer_delete(timer); + if (ret) + return -1; + + sa.sa_handler = SIG_DFL; + ret = sigaction(SIGALRM, &sa, NULL); + if (ret) + return -1; + + if (!in_order((struct timespec) {}, rmtp)) + return -1; + + if (!in_order(rmtp, rqtp)) + return -1; + + return 0; +} + +int main(int argc, char **argv) +{ + long long length; + int clockid, ret; + int max_clocks = CLOCK_TAI + 1; + + ksft_print_header(); + ksft_set_plan(max_clocks); + + for (clockid = CLOCK_REALTIME; clockid < max_clocks; clockid++) { + + /* Skip cputime clockids since nanosleep won't increment cputime */ + if (clockid == CLOCK_PROCESS_CPUTIME_ID || + clockid == CLOCK_THREAD_CPUTIME_ID || + clockid == CLOCK_HWSPECIFIC) { + ksft_test_result_skip("%-31s\n", clockstring(clockid)); + continue; + } + + fflush(stdout); + + length = 10; + while (length <= (NSEC_PER_SEC * 10)) { + ret = nanosleep_test(clockid, length); + if (ret == UNSUPPORTED) { + ksft_test_result_skip("%-31s\n", clockstring(clockid)); + goto next; + } + if (ret < 0) { + ksft_test_result_fail("%-31s\n", clockstring(clockid)); + ksft_exit_fail(); + } + length *= 100; + } + ret = nanosleep_test_remaining(clockid); + if (ret < 0) { + ksft_test_result_fail("%-31s\n", clockstring(clockid)); + ksft_exit_fail(); + } + ksft_test_result_pass("%-31s\n", clockstring(clockid)); +next: + ret = 0; + } + ksft_exit_pass(); +} |