1
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
