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		vdso = dlopen("linux-vdso32.so.1",
30			      RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
31	if (!vdso)
32		vdso = dlopen("linux-vdso64.so.1",
33			      RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
34	if (!vdso) {
35		pr_err("[WARN]\tfailed to find vDSO\n");
36		return;
37	}
38
39	vdso_clock_gettime = (vgettime_t)dlsym(vdso, "__vdso_clock_gettime");
40	if (!vdso_clock_gettime)
41		vdso_clock_gettime = (vgettime_t)dlsym(vdso, "__kernel_clock_gettime");
42	if (!vdso_clock_gettime)
43		pr_err("Warning: failed to find clock_gettime in vDSO\n");
44
45}
46
47static void test(clock_t clockid, char *clockstr, bool in_ns)
48{
49	struct timespec tp, start;
50	long i = 0;
51	const int timeout = 3;
52
53	vdso_clock_gettime(clockid, &start);
54	tp = start;
55	for (tp = start; start.tv_sec + timeout > tp.tv_sec ||
56			 (start.tv_sec + timeout == tp.tv_sec &&
57			  start.tv_nsec > tp.tv_nsec); i++) {
58		vdso_clock_gettime(clockid, &tp);
59	}
60
61	ksft_test_result_pass("%s:\tclock: %10s\tcycles:\t%10ld\n",
62			      in_ns ? "ns" : "host", clockstr, i);
63}
64
65int main(int argc, char *argv[])
66{
67	time_t offset = 10;
68	int nsfd;
69
70	ksft_set_plan(8);
71
72	fill_function_pointers();
73
74	test(CLOCK_MONOTONIC, "monotonic", false);
75	test(CLOCK_MONOTONIC_COARSE, "monotonic-coarse", false);
76	test(CLOCK_MONOTONIC_RAW, "monotonic-raw", false);
77	test(CLOCK_BOOTTIME, "boottime", false);
78
79	nscheck();
80
81	if (unshare_timens())
82		return 1;
83
84	nsfd = open("/proc/self/ns/time_for_children", O_RDONLY);
85	if (nsfd < 0)
86		return pr_perror("Can't open a time namespace");
87
88	if (_settime(CLOCK_MONOTONIC, offset))
89		return 1;
90	if (_settime(CLOCK_BOOTTIME, offset))
91		return 1;
92
93	if (setns(nsfd, CLONE_NEWTIME))
94		return pr_perror("setns");
95
96	test(CLOCK_MONOTONIC, "monotonic", true);
97	test(CLOCK_MONOTONIC_COARSE, "monotonic-coarse", true);
98	test(CLOCK_MONOTONIC_RAW, "monotonic-raw", true);
99	test(CLOCK_BOOTTIME, "boottime", true);
100
101	ksft_exit_pass();
102	return 0;
103}
104