104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sched.h>
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#include <time.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <dlfcn.h>
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#include "log.h"
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#include "timens.h"
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typedef int (*vgettime_t)(clockid_t, struct timespec *);
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vgettime_t vdso_clock_gettime;
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static void fill_function_pointers(void)
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{
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void *vdso = dlopen("linux-vdso.so.1",
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RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
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if (!vdso)
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vdso = dlopen("linux-gate.so.1",
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RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
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if (!vdso)
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vdso = dlopen("linux-vdso32.so.1",
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RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
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if (!vdso)
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vdso = dlopen("linux-vdso64.so.1",
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RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
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if (!vdso) {
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pr_err("[WARN]\tfailed to find vDSO\n");
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return;
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}
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vdso_clock_gettime = (vgettime_t)dlsym(vdso, "__vdso_clock_gettime");
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if (!vdso_clock_gettime)
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vdso_clock_gettime = (vgettime_t)dlsym(vdso, "__kernel_clock_gettime");
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if (!vdso_clock_gettime)
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pr_err("Warning: failed to find clock_gettime in vDSO\n");
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}
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static void test(clock_t clockid, char *clockstr, bool in_ns)
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{
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struct timespec tp, start;
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long i = 0;
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const int timeout = 3;
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vdso_clock_gettime(clockid, &start);
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tp = start;
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for (tp = start; start.tv_sec + timeout > tp.tv_sec ||
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(start.tv_sec + timeout == tp.tv_sec &&
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start.tv_nsec > tp.tv_nsec); i++) {
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vdso_clock_gettime(clockid, &tp);
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}
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ksft_test_result_pass("%s:\tclock: %10s\tcycles:\t%10ld\n",
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in_ns ? "ns" : "host", clockstr, i);
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}
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int main(int argc, char *argv[])
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{
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time_t offset = 10;
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int nsfd;
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ksft_set_plan(8);
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fill_function_pointers();
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test(CLOCK_MONOTONIC, "monotonic", false);
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test(CLOCK_MONOTONIC_COARSE, "monotonic-coarse", false);
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test(CLOCK_MONOTONIC_RAW, "monotonic-raw", false);
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test(CLOCK_BOOTTIME, "boottime", false);
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nscheck();
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if (unshare_timens())
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return 1;
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nsfd = open("/proc/self/ns/time_for_children", O_RDONLY);
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if (nsfd < 0)
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return pr_perror("Can't open a time namespace");
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if (_settime(CLOCK_MONOTONIC, offset))
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return 1;
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if (_settime(CLOCK_BOOTTIME, offset))
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return 1;
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if (setns(nsfd, CLONE_NEWTIME))
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return pr_perror("setns");
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test(CLOCK_MONOTONIC, "monotonic", true);
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test(CLOCK_MONOTONIC_COARSE, "monotonic-coarse", true);
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test(CLOCK_MONOTONIC_RAW, "monotonic-raw", true);
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test(CLOCK_BOOTTIME, "boottime", true);
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ksft_exit_pass();
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return 0;
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}
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