1 // SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
2 /*
3 * vdso_clock_getres.c: Sample code to test clock_getres.
4 * Copyright (c) 2019 Arm Ltd.
5 *
6 * Compile with:
7 * gcc -std=gnu99 vdso_clock_getres.c
8 *
9 * Tested on ARM, ARM64, MIPS32, x86 (32-bit and 64-bit),
10 * Power (32-bit and 64-bit), S390x (32-bit and 64-bit).
11 * Might work on other architectures.
12 */
13
14 #define _GNU_SOURCE
15 #include <elf.h>
16 #include <fcntl.h>
17 #include <stdint.h>
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <time.h>
21 #include <sys/auxv.h>
22 #include <sys/mman.h>
23 #include <sys/time.h>
24 #include <unistd.h>
25 #include <sys/syscall.h>
26
27 #include "../kselftest.h"
28
syscall_clock_getres(clockid_t _clkid,struct timespec * _ts)29 static long syscall_clock_getres(clockid_t _clkid, struct timespec *_ts)
30 {
31 long ret;
32
33 ret = syscall(SYS_clock_getres, _clkid, _ts);
34
35 return ret;
36 }
37
38 const char *vdso_clock_name[12] = {
39 "CLOCK_REALTIME",
40 "CLOCK_MONOTONIC",
41 "CLOCK_PROCESS_CPUTIME_ID",
42 "CLOCK_THREAD_CPUTIME_ID",
43 "CLOCK_MONOTONIC_RAW",
44 "CLOCK_REALTIME_COARSE",
45 "CLOCK_MONOTONIC_COARSE",
46 "CLOCK_BOOTTIME",
47 "CLOCK_REALTIME_ALARM",
48 "CLOCK_BOOTTIME_ALARM",
49 "CLOCK_SGI_CYCLE",
50 "CLOCK_TAI",
51 };
52
53 /*
54 * This function calls clock_getres in vdso and by system call
55 * with different values for clock_id.
56 *
57 * Example of output:
58 *
59 * clock_id: CLOCK_REALTIME [PASS]
60 * clock_id: CLOCK_BOOTTIME [PASS]
61 * clock_id: CLOCK_TAI [PASS]
62 * clock_id: CLOCK_REALTIME_COARSE [PASS]
63 * clock_id: CLOCK_MONOTONIC [PASS]
64 * clock_id: CLOCK_MONOTONIC_RAW [PASS]
65 * clock_id: CLOCK_MONOTONIC_COARSE [PASS]
66 */
vdso_test_clock(unsigned int clock_id)67 static inline int vdso_test_clock(unsigned int clock_id)
68 {
69 struct timespec x, y;
70
71 printf("clock_id: %s", vdso_clock_name[clock_id]);
72 clock_getres(clock_id, &x);
73 syscall_clock_getres(clock_id, &y);
74
75 if ((x.tv_sec != y.tv_sec) || (x.tv_nsec != y.tv_nsec)) {
76 printf(" [FAIL]\n");
77 return KSFT_FAIL;
78 }
79
80 printf(" [PASS]\n");
81 return KSFT_PASS;
82 }
83
main(int argc,char ** argv)84 int main(int argc, char **argv)
85 {
86 int ret = 0;
87
88 #if _POSIX_TIMERS > 0
89
90 #ifdef CLOCK_REALTIME
91 ret += vdso_test_clock(CLOCK_REALTIME);
92 #endif
93
94 #ifdef CLOCK_BOOTTIME
95 ret += vdso_test_clock(CLOCK_BOOTTIME);
96 #endif
97
98 #ifdef CLOCK_TAI
99 ret += vdso_test_clock(CLOCK_TAI);
100 #endif
101
102 #ifdef CLOCK_REALTIME_COARSE
103 ret += vdso_test_clock(CLOCK_REALTIME_COARSE);
104 #endif
105
106 #ifdef CLOCK_MONOTONIC
107 ret += vdso_test_clock(CLOCK_MONOTONIC);
108 #endif
109
110 #ifdef CLOCK_MONOTONIC_RAW
111 ret += vdso_test_clock(CLOCK_MONOTONIC_RAW);
112 #endif
113
114 #ifdef CLOCK_MONOTONIC_COARSE
115 ret += vdso_test_clock(CLOCK_MONOTONIC_COARSE);
116 #endif
117
118 #endif
119 if (ret > 0)
120 return KSFT_FAIL;
121
122 return KSFT_PASS;
123 }
124