1// SPDX-License-Identifier: GPL-2.0
2#define _GNU_SOURCE
3#include <sys/types.h>
4#include <sys/stat.h>
5#include <errno.h>
6#include <fcntl.h>
7#include <sched.h>
8#include <time.h>
9#include <stdio.h>
10#include <unistd.h>
11#include <sys/syscall.h>
12#include <dlfcn.h>
13
14#include "log.h"
15#include "timens.h"
16
17typedef int (*vgettime_t)(clockid_t, struct timespec *);
18
19vgettime_t vdso_clock_gettime;
20
21static void fill_function_pointers(void)
22{
23	void *vdso = dlopen("linux-vdso.so.1",
24			    RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
25	if (!vdso)
26		vdso = dlopen("linux-gate.so.1",
27			      RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
28	if (!vdso) {
29		pr_err("[WARN]\tfailed to find vDSO\n");
30		return;
31	}
32
33	vdso_clock_gettime = (vgettime_t)dlsym(vdso, "__vdso_clock_gettime");
34	if (!vdso_clock_gettime)
35		pr_err("Warning: failed to find clock_gettime in vDSO\n");
36
37}
38
39static void test(clock_t clockid, char *clockstr, bool in_ns)
40{
41	struct timespec tp, start;
42	long i = 0;
43	const int timeout = 3;
44
45	vdso_clock_gettime(clockid, &start);
46	tp = start;
47	for (tp = start; start.tv_sec + timeout > tp.tv_sec ||
48			 (start.tv_sec + timeout == tp.tv_sec &&
49			  start.tv_nsec > tp.tv_nsec); i++) {
50		vdso_clock_gettime(clockid, &tp);
51	}
52
53	ksft_test_result_pass("%s:\tclock: %10s\tcycles:\t%10ld\n",
54			      in_ns ? "ns" : "host", clockstr, i);
55}
56
57int main(int argc, char *argv[])
58{
59	time_t offset = 10;
60	int nsfd;
61
62	ksft_set_plan(8);
63
64	fill_function_pointers();
65
66	test(CLOCK_MONOTONIC, "monotonic", false);
67	test(CLOCK_MONOTONIC_COARSE, "monotonic-coarse", false);
68	test(CLOCK_MONOTONIC_RAW, "monotonic-raw", false);
69	test(CLOCK_BOOTTIME, "boottime", false);
70
71	nscheck();
72
73	if (unshare_timens())
74		return 1;
75
76	nsfd = open("/proc/self/ns/time_for_children", O_RDONLY);
77	if (nsfd < 0)
78		return pr_perror("Can't open a time namespace");
79
80	if (_settime(CLOCK_MONOTONIC, offset))
81		return 1;
82	if (_settime(CLOCK_BOOTTIME, offset))
83		return 1;
84
85	if (setns(nsfd, CLONE_NEWTIME))
86		return pr_perror("setns");
87
88	test(CLOCK_MONOTONIC, "monotonic", true);
89	test(CLOCK_MONOTONIC_COARSE, "monotonic-coarse", true);
90	test(CLOCK_MONOTONIC_RAW, "monotonic-raw", true);
91	test(CLOCK_BOOTTIME, "boottime", true);
92
93	ksft_exit_pass();
94	return 0;
95}
96