1*4882a593Smuzhiyun /* Set tz value
2*4882a593Smuzhiyun * by: John Stultz <john.stultz@linaro.org>
3*4882a593Smuzhiyun * (C) Copyright Linaro 2016
4*4882a593Smuzhiyun * Licensed under the GPLv2
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * This program is free software: you can redistribute it and/or modify
7*4882a593Smuzhiyun * it under the terms of the GNU General Public License as published by
8*4882a593Smuzhiyun * the Free Software Foundation, either version 2 of the License, or
9*4882a593Smuzhiyun * (at your option) any later version.
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * This program is distributed in the hope that it will be useful,
12*4882a593Smuzhiyun * but WITHOUT ANY WARRANTY; without even the implied warranty of
13*4882a593Smuzhiyun * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14*4882a593Smuzhiyun * GNU General Public License for more details.
15*4882a593Smuzhiyun */
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #include <stdio.h>
19*4882a593Smuzhiyun #include <stdlib.h>
20*4882a593Smuzhiyun #include <time.h>
21*4882a593Smuzhiyun #include <sys/time.h>
22*4882a593Smuzhiyun #include <sys/timex.h>
23*4882a593Smuzhiyun #include <string.h>
24*4882a593Smuzhiyun #include <signal.h>
25*4882a593Smuzhiyun #include <unistd.h>
26*4882a593Smuzhiyun #include "../kselftest.h"
27*4882a593Smuzhiyun
set_tz(int min,int dst)28*4882a593Smuzhiyun int set_tz(int min, int dst)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun struct timezone tz;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun tz.tz_minuteswest = min;
33*4882a593Smuzhiyun tz.tz_dsttime = dst;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun return settimeofday(0, &tz);
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
get_tz_min(void)38*4882a593Smuzhiyun int get_tz_min(void)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun struct timezone tz;
41*4882a593Smuzhiyun struct timeval tv;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun memset(&tz, 0, sizeof(tz));
44*4882a593Smuzhiyun gettimeofday(&tv, &tz);
45*4882a593Smuzhiyun return tz.tz_minuteswest;
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
get_tz_dst(void)48*4882a593Smuzhiyun int get_tz_dst(void)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun struct timezone tz;
51*4882a593Smuzhiyun struct timeval tv;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun memset(&tz, 0, sizeof(tz));
54*4882a593Smuzhiyun gettimeofday(&tv, &tz);
55*4882a593Smuzhiyun return tz.tz_dsttime;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
main(int argc,char ** argv)58*4882a593Smuzhiyun int main(int argc, char **argv)
59*4882a593Smuzhiyun {
60*4882a593Smuzhiyun int i, ret;
61*4882a593Smuzhiyun int min, dst;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun min = get_tz_min();
64*4882a593Smuzhiyun dst = get_tz_dst();
65*4882a593Smuzhiyun printf("tz_minuteswest started at %i, dst at %i\n", min, dst);
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun printf("Checking tz_minuteswest can be properly set: ");
68*4882a593Smuzhiyun fflush(stdout);
69*4882a593Smuzhiyun for (i = -15*60; i < 15*60; i += 30) {
70*4882a593Smuzhiyun ret = set_tz(i, dst);
71*4882a593Smuzhiyun ret = get_tz_min();
72*4882a593Smuzhiyun if (ret != i) {
73*4882a593Smuzhiyun printf("[FAILED] expected: %i got %i\n", i, ret);
74*4882a593Smuzhiyun goto err;
75*4882a593Smuzhiyun }
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun printf("[OK]\n");
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun printf("Checking invalid tz_minuteswest values are caught: ");
80*4882a593Smuzhiyun fflush(stdout);
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun if (!set_tz(-15*60-1, dst)) {
83*4882a593Smuzhiyun printf("[FAILED] %i didn't return failure!\n", -15*60-1);
84*4882a593Smuzhiyun goto err;
85*4882a593Smuzhiyun }
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun if (!set_tz(15*60+1, dst)) {
88*4882a593Smuzhiyun printf("[FAILED] %i didn't return failure!\n", 15*60+1);
89*4882a593Smuzhiyun goto err;
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun if (!set_tz(-24*60, dst)) {
93*4882a593Smuzhiyun printf("[FAILED] %i didn't return failure!\n", -24*60);
94*4882a593Smuzhiyun goto err;
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun
97*4882a593Smuzhiyun if (!set_tz(24*60, dst)) {
98*4882a593Smuzhiyun printf("[FAILED] %i didn't return failure!\n", 24*60);
99*4882a593Smuzhiyun goto err;
100*4882a593Smuzhiyun }
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun printf("[OK]\n");
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun set_tz(min, dst);
105*4882a593Smuzhiyun return ksft_exit_pass();
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun err:
108*4882a593Smuzhiyun set_tz(min, dst);
109*4882a593Smuzhiyun return ksft_exit_fail();
110*4882a593Smuzhiyun }
111