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 set_tz(int min,int dst)28 int 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 get_tz_min(void)38 int 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 get_tz_dst(void)48 int 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 main(int argc,char ** argv)58 int 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 fflush(stdout); 69 for (i = -15*60; i < 15*60; i += 30) { 70 ret = set_tz(i, dst); 71 ret = get_tz_min(); 72 if (ret != i) { 73 printf("[FAILED] expected: %i got %i\n", i, ret); 74 goto err; 75 } 76 } 77 printf("[OK]\n"); 78 79 printf("Checking invalid tz_minuteswest values are caught: "); 80 fflush(stdout); 81 82 if (!set_tz(-15*60-1, dst)) { 83 printf("[FAILED] %i didn't return failure!\n", -15*60-1); 84 goto err; 85 } 86 87 if (!set_tz(15*60+1, dst)) { 88 printf("[FAILED] %i didn't return failure!\n", 15*60+1); 89 goto err; 90 } 91 92 if (!set_tz(-24*60, dst)) { 93 printf("[FAILED] %i didn't return failure!\n", -24*60); 94 goto err; 95 } 96 97 if (!set_tz(24*60, dst)) { 98 printf("[FAILED] %i didn't return failure!\n", 24*60); 99 goto err; 100 } 101 102 printf("[OK]\n"); 103 104 set_tz(min, dst); 105 return ksft_exit_pass(); 106 107 err: 108 set_tz(min, dst); 109 return ksft_exit_fail(); 110 } 111