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 | |
22 | #include <errno.h> |
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> |
30 | #include "../kselftest.h" |
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(a: target, b: 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(a: target, b: 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 | ksft_print_header(); |
137 | ksft_set_plan(NR_CLOCKIDS); |
138 | |
139 | for (clockid = CLOCK_REALTIME; clockid < NR_CLOCKIDS; clockid++) { |
140 | |
141 | /* Skip cputime clockids since nanosleep won't increment cputime */ |
142 | if (clockid == CLOCK_PROCESS_CPUTIME_ID || |
143 | clockid == CLOCK_THREAD_CPUTIME_ID || |
144 | clockid == CLOCK_HWSPECIFIC) { |
145 | ksft_test_result_skip(msg: "%-31s\n" , clockstring(clockid)); |
146 | continue; |
147 | } |
148 | |
149 | fflush(stdout); |
150 | |
151 | length = 10; |
152 | while (length <= (NSEC_PER_SEC * 10)) { |
153 | ret = nanosleep_test(clockid, ns: length); |
154 | if (ret == UNSUPPORTED) { |
155 | ksft_test_result_skip(msg: "%-31s\n" , clockstring(clockid)); |
156 | goto next; |
157 | } |
158 | if (ret < 0) { |
159 | ksft_test_result_fail(msg: "%-31s\n" , clockstring(clockid)); |
160 | ksft_exit_fail(); |
161 | } |
162 | length *= 100; |
163 | } |
164 | ksft_test_result_pass(msg: "%-31s\n" , clockstring(clockid)); |
165 | next: |
166 | ret = 0; |
167 | } |
168 | ksft_exit_pass(); |
169 | } |
170 | |