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689f32fb JS |
1 | /* Make sure timers don't return early |
2 | * by: john stultz (johnstul@us.ibm.com) | |
3 | * John Stultz (john.stultz@linaro.org) | |
4 | * (C) Copyright IBM 2012 | |
5 | * (C) Copyright Linaro 2013 2015 | |
6 | * Licensed under the GPLv2 | |
7 | * | |
8 | * To build: | |
9 | * $ gcc nanosleep.c -o nanosleep -lrt | |
10 | * | |
11 | * This program is free software: you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation, either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | */ | |
21 | ||
c1ee4831 | 22 | #include <errno.h> |
689f32fb JS |
23 | #include <stdio.h> |
24 | #include <stdlib.h> | |
25 | #include <time.h> | |
26 | #include <sys/time.h> | |
27 | #include <sys/timex.h> | |
28 | #include <string.h> | |
29 | #include <signal.h> | |
689f32fb | 30 | #include "../kselftest.h" |
689f32fb JS |
31 | |
32 | #define NSEC_PER_SEC 1000000000ULL | |
33 | ||
34 | #define CLOCK_REALTIME 0 | |
35 | #define CLOCK_MONOTONIC 1 | |
36 | #define CLOCK_PROCESS_CPUTIME_ID 2 | |
37 | #define CLOCK_THREAD_CPUTIME_ID 3 | |
38 | #define CLOCK_MONOTONIC_RAW 4 | |
39 | #define CLOCK_REALTIME_COARSE 5 | |
40 | #define CLOCK_MONOTONIC_COARSE 6 | |
41 | #define CLOCK_BOOTTIME 7 | |
42 | #define CLOCK_REALTIME_ALARM 8 | |
43 | #define CLOCK_BOOTTIME_ALARM 9 | |
44 | #define CLOCK_HWSPECIFIC 10 | |
45 | #define CLOCK_TAI 11 | |
46 | #define NR_CLOCKIDS 12 | |
47 | ||
48 | #define UNSUPPORTED 0xf00f | |
49 | ||
50 | char *clockstring(int clockid) | |
51 | { | |
52 | switch (clockid) { | |
53 | case CLOCK_REALTIME: | |
54 | return "CLOCK_REALTIME"; | |
55 | case CLOCK_MONOTONIC: | |
56 | return "CLOCK_MONOTONIC"; | |
57 | case CLOCK_PROCESS_CPUTIME_ID: | |
58 | return "CLOCK_PROCESS_CPUTIME_ID"; | |
59 | case CLOCK_THREAD_CPUTIME_ID: | |
60 | return "CLOCK_THREAD_CPUTIME_ID"; | |
61 | case CLOCK_MONOTONIC_RAW: | |
62 | return "CLOCK_MONOTONIC_RAW"; | |
63 | case CLOCK_REALTIME_COARSE: | |
64 | return "CLOCK_REALTIME_COARSE"; | |
65 | case CLOCK_MONOTONIC_COARSE: | |
66 | return "CLOCK_MONOTONIC_COARSE"; | |
67 | case CLOCK_BOOTTIME: | |
68 | return "CLOCK_BOOTTIME"; | |
69 | case CLOCK_REALTIME_ALARM: | |
70 | return "CLOCK_REALTIME_ALARM"; | |
71 | case CLOCK_BOOTTIME_ALARM: | |
72 | return "CLOCK_BOOTTIME_ALARM"; | |
73 | case CLOCK_TAI: | |
74 | return "CLOCK_TAI"; | |
75 | }; | |
76 | return "UNKNOWN_CLOCKID"; | |
77 | } | |
78 | ||
79 | /* returns 1 if a <= b, 0 otherwise */ | |
80 | static inline int in_order(struct timespec a, struct timespec b) | |
81 | { | |
82 | if (a.tv_sec < b.tv_sec) | |
83 | return 1; | |
84 | if (a.tv_sec > b.tv_sec) | |
85 | return 0; | |
86 | if (a.tv_nsec > b.tv_nsec) | |
87 | return 0; | |
88 | return 1; | |
89 | } | |
90 | ||
91 | struct timespec timespec_add(struct timespec ts, unsigned long long ns) | |
92 | { | |
93 | ts.tv_nsec += ns; | |
94 | while (ts.tv_nsec >= NSEC_PER_SEC) { | |
95 | ts.tv_nsec -= NSEC_PER_SEC; | |
96 | ts.tv_sec++; | |
97 | } | |
98 | return ts; | |
99 | } | |
100 | ||
101 | int nanosleep_test(int clockid, long long ns) | |
102 | { | |
103 | struct timespec now, target, rel; | |
104 | ||
105 | /* First check abs time */ | |
106 | if (clock_gettime(clockid, &now)) | |
107 | return UNSUPPORTED; | |
108 | target = timespec_add(now, ns); | |
109 | ||
110 | if (clock_nanosleep(clockid, TIMER_ABSTIME, &target, NULL)) | |
111 | return UNSUPPORTED; | |
112 | clock_gettime(clockid, &now); | |
113 | ||
114 | if (!in_order(target, now)) | |
115 | return -1; | |
116 | ||
117 | /* Second check reltime */ | |
118 | clock_gettime(clockid, &now); | |
119 | rel.tv_sec = 0; | |
120 | rel.tv_nsec = 0; | |
121 | rel = timespec_add(rel, ns); | |
122 | target = timespec_add(now, ns); | |
123 | clock_nanosleep(clockid, 0, &rel, NULL); | |
124 | clock_gettime(clockid, &now); | |
125 | ||
126 | if (!in_order(target, now)) | |
127 | return -1; | |
128 | return 0; | |
129 | } | |
130 | ||
131 | int main(int argc, char **argv) | |
132 | { | |
133 | long long length; | |
134 | int clockid, ret; | |
135 | ||
136 | for (clockid = CLOCK_REALTIME; clockid < NR_CLOCKIDS; clockid++) { | |
137 | ||
138 | /* Skip cputime clockids since nanosleep won't increment cputime */ | |
139 | if (clockid == CLOCK_PROCESS_CPUTIME_ID || | |
140 | clockid == CLOCK_THREAD_CPUTIME_ID || | |
141 | clockid == CLOCK_HWSPECIFIC) | |
142 | continue; | |
143 | ||
144 | printf("Nanosleep %-31s ", clockstring(clockid)); | |
19de0f85 | 145 | fflush(stdout); |
689f32fb JS |
146 | |
147 | length = 10; | |
148 | while (length <= (NSEC_PER_SEC * 10)) { | |
149 | ret = nanosleep_test(clockid, length); | |
150 | if (ret == UNSUPPORTED) { | |
151 | printf("[UNSUPPORTED]\n"); | |
152 | goto next; | |
153 | } | |
154 | if (ret < 0) { | |
155 | printf("[FAILED]\n"); | |
156 | return ksft_exit_fail(); | |
157 | } | |
158 | length *= 100; | |
159 | } | |
160 | printf("[OK]\n"); | |
161 | next: | |
162 | ret = 0; | |
163 | } | |
164 | return ksft_exit_pass(); | |
165 | } |