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103 lines
2.4 KiB
103 lines
2.4 KiB
// 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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