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// SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
/*
* vdso_clock_getres.c: Sample code to test clock_getres.
* Copyright (c) 2019 Arm Ltd.
*
* Compile with:
* gcc -std=gnu99 vdso_clock_getres.c
*
* Tested on ARM, ARM64, MIPS32, x86 (32-bit and 64-bit),
* Power (32-bit and 64-bit), S390x (32-bit and 64-bit).
* Might work on other architectures.
*/
#define _GNU_SOURCE
#include <elf.h>
#include <err.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/auxv.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <unistd.h>
#include <sys/syscall.h>
#include "../kselftest.h"
static long syscall_clock_getres(clockid_t _clkid, struct timespec *_ts)
{
long ret;
ret = syscall(SYS_clock_getres, _clkid, _ts);
return ret;
}
const char *vdso_clock_name[12] = {
"CLOCK_REALTIME",
"CLOCK_MONOTONIC",
"CLOCK_PROCESS_CPUTIME_ID",
"CLOCK_THREAD_CPUTIME_ID",
"CLOCK_MONOTONIC_RAW",
"CLOCK_REALTIME_COARSE",
"CLOCK_MONOTONIC_COARSE",
"CLOCK_BOOTTIME",
"CLOCK_REALTIME_ALARM",
"CLOCK_BOOTTIME_ALARM",
"CLOCK_SGI_CYCLE",
"CLOCK_TAI",
};
/*
* This function calls clock_getres in vdso and by system call
* with different values for clock_id.
*
* Example of output:
*
* clock_id: CLOCK_REALTIME [PASS]
* clock_id: CLOCK_BOOTTIME [PASS]
* clock_id: CLOCK_TAI [PASS]
* clock_id: CLOCK_REALTIME_COARSE [PASS]
* clock_id: CLOCK_MONOTONIC [PASS]
* clock_id: CLOCK_MONOTONIC_RAW [PASS]
* clock_id: CLOCK_MONOTONIC_COARSE [PASS]
*/
static inline int vdso_test_clock(unsigned int clock_id)
{
struct timespec x, y;
printf("clock_id: %s", vdso_clock_name[clock_id]);
clock_getres(clock_id, &x);
syscall_clock_getres(clock_id, &y);
if ((x.tv_sec != y.tv_sec) || (x.tv_nsec != y.tv_nsec)) {
printf(" [FAIL]\n");
return KSFT_FAIL;
}
printf(" [PASS]\n");
return KSFT_PASS;
}
int main(int argc, char **argv)
{
int ret;
#if _POSIX_TIMERS > 0
#ifdef CLOCK_REALTIME
ret = vdso_test_clock(CLOCK_REALTIME);
#endif
#ifdef CLOCK_BOOTTIME
ret += vdso_test_clock(CLOCK_BOOTTIME);
#endif
#ifdef CLOCK_TAI
ret += vdso_test_clock(CLOCK_TAI);
#endif
#ifdef CLOCK_REALTIME_COARSE
ret += vdso_test_clock(CLOCK_REALTIME_COARSE);
#endif
#ifdef CLOCK_MONOTONIC
ret += vdso_test_clock(CLOCK_MONOTONIC);
#endif
#ifdef CLOCK_MONOTONIC_RAW
ret += vdso_test_clock(CLOCK_MONOTONIC_RAW);
#endif
#ifdef CLOCK_MONOTONIC_COARSE
ret += vdso_test_clock(CLOCK_MONOTONIC_COARSE);
#endif
#endif
if (ret > 0)
return KSFT_FAIL;
return KSFT_PASS;
}
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