tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* Set tz value
2 * by: John Stultz <john.stultz@linaro.org>
3 * (C) Copyright Linaro 2016
4 * Licensed under the GPLv2
5 *
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17
18#include <stdio.h>
19#include <stdlib.h>
20#include <time.h>
21#include <sys/time.h>
22#include <sys/timex.h>
23#include <string.h>
24#include <signal.h>
25#include <unistd.h>
26#include "../kselftest.h"
27
28int set_tz(int min, int dst)
29{
30 struct timezone tz;
31
32 tz.tz_minuteswest = min;
33 tz.tz_dsttime = dst;
34
35 return settimeofday(0, &tz);
36}
37
38int get_tz_min(void)
39{
40 struct timezone tz;
41 struct timeval tv;
42
43 memset(&tz, 0, sizeof(tz));
44 gettimeofday(&tv, &tz);
45 return tz.tz_minuteswest;
46}
47
48int get_tz_dst(void)
49{
50 struct timezone tz;
51 struct timeval tv;
52
53 memset(&tz, 0, sizeof(tz));
54 gettimeofday(&tv, &tz);
55 return tz.tz_dsttime;
56}
57
58int main(int argc, char **argv)
59{
60 int i, ret;
61 int min, dst;
62
63 min = get_tz_min();
64 dst = get_tz_dst();
65 printf("tz_minuteswest started at %i, dst at %i\n", min, dst);
66
67 printf("Checking tz_minuteswest can be properly set: ");
68 for (i = -15*60; i < 15*60; i += 30) {
69 ret = set_tz(i, dst);
70 ret = get_tz_min();
71 if (ret != i) {
72 printf("[FAILED] expected: %i got %i\n", i, ret);
73 goto err;
74 }
75 }
76 printf("[OK]\n");
77
78 printf("Checking invalid tz_minuteswest values are caught: ");
79
80 if (!set_tz(-15*60-1, dst)) {
81 printf("[FAILED] %i didn't return failure!\n", -15*60-1);
82 goto err;
83 }
84
85 if (!set_tz(15*60+1, dst)) {
86 printf("[FAILED] %i didn't return failure!\n", 15*60+1);
87 goto err;
88 }
89
90 if (!set_tz(-24*60, dst)) {
91 printf("[FAILED] %i didn't return failure!\n", -24*60);
92 goto err;
93 }
94
95 if (!set_tz(24*60, dst)) {
96 printf("[FAILED] %i didn't return failure!\n", 24*60);
97 goto err;
98 }
99
100 printf("[OK]\n");
101
102 set_tz(min, dst);
103 return ksft_exit_pass();
104
105err:
106 set_tz(min, dst);
107 return ksft_exit_fail();
108}