1 | /* ADJ_FREQ Skew consistency test |
2 | * by: john stultz (johnstul@us.ibm.com) |
3 | * (C) Copyright IBM 2012 |
4 | * Licensed under the GPLv2 |
5 | * |
6 | * NOTE: This is a meta-test which cranks the ADJ_FREQ knob back |
7 | * and forth and watches for consistency problems. Thus this test requires |
8 | * that the inconsistency-check tests be present in the same directory it |
9 | * is run from. |
10 | * |
11 | * To build: |
12 | * $ gcc skew_consistency.c -o skew_consistency -lrt |
13 | * |
14 | * This program is free software: you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation, either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * This program is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | */ |
24 | |
25 | |
26 | #include <stdio.h> |
27 | #include <stdlib.h> |
28 | #include <unistd.h> |
29 | #include <sys/time.h> |
30 | #include <sys/timex.h> |
31 | #include <time.h> |
32 | #include <sys/types.h> |
33 | #include <sys/stat.h> |
34 | #include <fcntl.h> |
35 | #include <string.h> |
36 | #include <sys/wait.h> |
37 | #include "../kselftest.h" |
38 | |
39 | #define NSEC_PER_SEC 1000000000LL |
40 | |
41 | int main(int argc, char **argv) |
42 | { |
43 | struct timex tx; |
44 | int ret, ppm; |
45 | pid_t pid; |
46 | |
47 | |
48 | printf("Running Asynchronous Frequency Changing Tests...\n" ); |
49 | |
50 | pid = fork(); |
51 | if (!pid) |
52 | return system("./inconsistency-check -c 1 -t 600" ); |
53 | |
54 | ppm = 500; |
55 | ret = 0; |
56 | |
57 | while (pid != waitpid(pid, &ret, WNOHANG)) { |
58 | ppm = -ppm; |
59 | tx.modes = ADJ_FREQUENCY; |
60 | tx.freq = ppm << 16; |
61 | adjtimex(&tx); |
62 | usleep(500000); |
63 | } |
64 | |
65 | /* Set things back */ |
66 | tx.modes = ADJ_FREQUENCY; |
67 | tx.offset = 0; |
68 | adjtimex(&tx); |
69 | |
70 | |
71 | if (ret) { |
72 | printf("[FAILED]\n" ); |
73 | return ksft_exit_fail(); |
74 | } |
75 | printf("[OK]\n" ); |
76 | return ksft_exit_pass(); |
77 | } |
78 | |