1 | /* Time inconsistency check test |
2 | * by: john stultz (johnstul@us.ibm.com) |
3 | * (C) Copyright IBM 2003, 2004, 2005, 2012 |
4 | * (C) Copyright Linaro Limited 2015 |
5 | * Licensed under the GPLv2 |
6 | * |
7 | * To build: |
8 | * $ gcc inconsistency-check.c -o inconsistency-check -lrt |
9 | * |
10 | * This program is free software: you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License as published by |
12 | * the Free Software Foundation, either version 2 of the License, or |
13 | * (at your option) any later version. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
18 | * GNU General Public License for more details. |
19 | */ |
20 | |
21 | |
22 | |
23 | #include <stdio.h> |
24 | #include <unistd.h> |
25 | #include <stdlib.h> |
26 | #include <time.h> |
27 | #include <sys/time.h> |
28 | #include <sys/timex.h> |
29 | #include <string.h> |
30 | #include <signal.h> |
31 | #include "../kselftest.h" |
32 | |
33 | #define CALLS_PER_LOOP 64 |
34 | #define NSEC_PER_SEC 1000000000ULL |
35 | |
36 | #define CLOCK_REALTIME 0 |
37 | #define CLOCK_MONOTONIC 1 |
38 | #define CLOCK_PROCESS_CPUTIME_ID 2 |
39 | #define CLOCK_THREAD_CPUTIME_ID 3 |
40 | #define CLOCK_MONOTONIC_RAW 4 |
41 | #define CLOCK_REALTIME_COARSE 5 |
42 | #define CLOCK_MONOTONIC_COARSE 6 |
43 | #define CLOCK_BOOTTIME 7 |
44 | #define CLOCK_REALTIME_ALARM 8 |
45 | #define CLOCK_BOOTTIME_ALARM 9 |
46 | #define CLOCK_HWSPECIFIC 10 |
47 | #define CLOCK_TAI 11 |
48 | #define NR_CLOCKIDS 12 |
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 | /* use unsigned to avoid false positives on 2038 rollover */ |
83 | if ((unsigned long)a.tv_sec < (unsigned long)b.tv_sec) |
84 | return 1; |
85 | if ((unsigned long)a.tv_sec > (unsigned long)b.tv_sec) |
86 | return 0; |
87 | if (a.tv_nsec > b.tv_nsec) |
88 | return 0; |
89 | return 1; |
90 | } |
91 | |
92 | |
93 | |
94 | int consistency_test(int clock_type, unsigned long seconds) |
95 | { |
96 | struct timespec list[CALLS_PER_LOOP]; |
97 | int i, inconsistent; |
98 | long now, then; |
99 | time_t t; |
100 | char *start_str; |
101 | |
102 | clock_gettime(clock_type, &list[0]); |
103 | now = then = list[0].tv_sec; |
104 | |
105 | /* timestamp start of test */ |
106 | t = time(0); |
107 | start_str = ctime(&t); |
108 | |
109 | while (seconds == -1 || now - then < seconds) { |
110 | inconsistent = -1; |
111 | |
112 | /* Fill list */ |
113 | for (i = 0; i < CALLS_PER_LOOP; i++) |
114 | clock_gettime(clock_type, &list[i]); |
115 | |
116 | /* Check for inconsistencies */ |
117 | for (i = 0; i < CALLS_PER_LOOP - 1; i++) |
118 | if (!in_order(a: list[i], b: list[i+1])) |
119 | inconsistent = i; |
120 | |
121 | /* display inconsistency */ |
122 | if (inconsistent >= 0) { |
123 | unsigned long long delta; |
124 | |
125 | ksft_print_msg(msg: "\%s\n" , start_str); |
126 | for (i = 0; i < CALLS_PER_LOOP; i++) { |
127 | if (i == inconsistent) |
128 | ksft_print_msg(msg: "--------------------\n" ); |
129 | ksft_print_msg(msg: "%lu:%lu\n" , list[i].tv_sec, |
130 | list[i].tv_nsec); |
131 | if (i == inconsistent + 1) |
132 | ksft_print_msg(msg: "--------------------\n" ); |
133 | } |
134 | delta = list[inconsistent].tv_sec * NSEC_PER_SEC; |
135 | delta += list[inconsistent].tv_nsec; |
136 | delta -= list[inconsistent+1].tv_sec * NSEC_PER_SEC; |
137 | delta -= list[inconsistent+1].tv_nsec; |
138 | ksft_print_msg(msg: "Delta: %llu ns\n" , delta); |
139 | fflush(0); |
140 | /* timestamp inconsistency*/ |
141 | t = time(0); |
142 | ksft_print_msg(msg: "%s\n" , ctime(&t)); |
143 | return -1; |
144 | } |
145 | now = list[0].tv_sec; |
146 | } |
147 | return 0; |
148 | } |
149 | |
150 | |
151 | int main(int argc, char *argv[]) |
152 | { |
153 | int clockid, opt; |
154 | int userclock = CLOCK_REALTIME; |
155 | int maxclocks = NR_CLOCKIDS; |
156 | int runtime = 10; |
157 | struct timespec ts; |
158 | |
159 | /* Process arguments */ |
160 | while ((opt = getopt(argc, argv, "t:c:" )) != -1) { |
161 | switch (opt) { |
162 | case 't': |
163 | runtime = atoi(optarg); |
164 | break; |
165 | case 'c': |
166 | userclock = atoi(optarg); |
167 | maxclocks = userclock + 1; |
168 | break; |
169 | default: |
170 | printf("Usage: %s [-t <secs>] [-c <clockid>]\n" , argv[0]); |
171 | printf(" -t: Number of seconds to run\n" ); |
172 | printf(" -c: clockid to use (default, all clockids)\n" ); |
173 | exit(-1); |
174 | } |
175 | } |
176 | |
177 | setbuf(stdout, NULL); |
178 | |
179 | ksft_print_header(); |
180 | ksft_set_plan(plan: maxclocks - userclock); |
181 | |
182 | for (clockid = userclock; clockid < maxclocks; clockid++) { |
183 | |
184 | if (clockid == CLOCK_HWSPECIFIC || clock_gettime(clockid, &ts)) { |
185 | ksft_test_result_skip(msg: "%-31s\n" , clockstring(clockid)); |
186 | continue; |
187 | } |
188 | |
189 | if (consistency_test(clock_type: clockid, seconds: runtime)) { |
190 | ksft_test_result_fail(msg: "%-31s\n" , clockstring(clockid)); |
191 | ksft_exit_fail(); |
192 | } else { |
193 | ksft_test_result_pass(msg: "%-31s\n" , clockstring(clockid)); |
194 | } |
195 | } |
196 | ksft_exit_pass(); |
197 | } |
198 | |