1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright (c) 1995 Sun Microsystems, Inc. All rights reserved. 24 */ 25 26 #ident "%Z%%M% %I% %E% SMI" 27 28 #include <stdio.h> 29 #include <stdlib.h> 30 #include <time.h> 31 #include <tzfile.h> 32 #include <sys/time.h> 33 34 static int get_tzp_info(void); 35 extern long _timezone, _altzone; /* from the base libc */ 36 37 38 /* 39 * The second parameter to gettimeofday() did not work correctly on 40 * 4.x, and it was documented that localtime() should be used instead. 41 * This is an attempt to provide correctly what 4.x meant to do. There 42 * are shortcomings, however. See notes for DST_RUM and DST_AUSTALT. 43 */ 44 45 int 46 gettimeofday(tp, tzp) 47 struct timeval *tp; 48 struct timezone *tzp; 49 { 50 int ret = 0; 51 52 if (tp != NULL) 53 if ((ret = _gettimeofday(tp)) == -1) 54 maperror(); 55 56 /* 57 * We should call localtime() with the current time and 58 * set tz_minuteswest to _altzone/SECSPERMIN if tm_isdst 59 * is set. But we want to be bug-for-bug compatible with 60 * 4.x, which would never adjust for DST. Futher comments 61 * are in get_tzp_info(). 62 */ 63 if (tzp != NULL) { 64 _tzset(); 65 tzp->tz_dsttime = get_tzp_info(); 66 tzp->tz_minuteswest = _timezone/SECSPERMIN; 67 } 68 69 return(ret); 70 } 71 72 static int 73 get_tzp_info() 74 { 75 char *zonename = getenv("TZ"); 76 77 if ((zonename == NULL) || (*zonename == '\0')) 78 return (DST_NONE); 79 80 if ((strncmp(zonename, "US/", 3) == 0) || 81 (strcmp(zonename, "PST8PDT") == 0) || 82 (strcmp(zonename, "MST7MDT") == 0) || 83 (strcmp(zonename, "CST6CDT") == 0) || 84 (strcmp(zonename, "EST5EDT") == 0) || 85 (strncmp(zonename, "America/", 8) == 0)) 86 return (DST_USA); 87 88 if (strncmp(zonename, "Australia/", 10) == 0) 89 return (DST_AUST); 90 91 if (strcmp(zonename, "WET") == 0) 92 return (DST_WET); 93 94 if (strcmp(zonename, "MET") == 0) 95 return (DST_MET); 96 97 if (strcmp(zonename, "EET") == 0) 98 return (DST_EET); 99 100 if (strncmp(zonename, "Canada/", 7) == 0) 101 return (DST_CAN); 102 103 if ((strcmp(zonename, "GB") == 0) || 104 (strcmp(zonename, "GB-Eire") == 0)) 105 return (DST_GB); 106 107 /* 108 * what's the corresponding DST_RUM: Rumanian DST? 109 * There was not Rumanian timezone on 4.x. 110 */ 111 112 if (strcmp(zonename, "Turkey") == 0) 113 return (DST_TUR); 114 115 /* 116 * How do we differentiate between DST_AUST and DST_AUSTALT? 117 * It seems that all of our current Australia timezones do 118 * not have the 1986 shift, so we never will return DST_AUSTALT. 119 */ 120 121 return (DST_NONE); 122 } 123