/* * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved * * File: libc/sys/gettimeofday.c */ #include <time.h> #include <tzfile.h> #include <sys/time.h> #include <errno.h> #include <sys/syscall.h> #include <unistd.h> int gettimeofday (struct timeval *tp, struct timezone *tzp) { static int validtz = 0; static struct timezone cached_tz = {0}; if (syscall (SYS_gettimeofday, tp, tzp) < 0) { return (-1); } if (validtz == 0) { struct tm *localtm = localtime ((time_t *)&tp->tv_sec); cached_tz.tz_dsttime = localtm->tm_isdst; cached_tz.tz_minuteswest = (-localtm->tm_gmtoff / SECSPERMIN) + (localtm->tm_isdst * MINSPERHOUR); validtz = 1; } if (tzp) { tzp->tz_dsttime = cached_tz.tz_dsttime; tzp->tz_minuteswest = cached_tz.tz_minuteswest; } return (0); }