/*---------------------------------------------------------------  * Copyright (c) 1999,2000,2001,2002,2003                               * The Board of Trustees of the University of Illinois             * All Rights Reserved.                                            *---------------------------------------------------------------  * Permission is hereby granted, free of charge, to any person     * obtaining a copy of this software (Iperf) and associated        * documentation files (the "Software"), to deal in the Software   * without restriction, including without limitation the           * rights to use, copy, modify, merge, publish, distribute,         * sublicense, and/or sell copies of the Software, and to permit      * persons to whom the Software is furnished to do * so, subject to the following conditions:  * *      * Redistributions of source code must retain the above  * copyright notice, this list of conditions and  * the following disclaimers.  * *      * Redistributions in binary form must reproduce the above  * copyright notice, this list of conditions and the following  * disclaimers in the documentation and/or other materials  * provided with the distribution.  *  *      * Neither the names of the University of Illinois, NCSA,  * nor the names of its contributors may be used to endorse  * or promote products derived from this Software without * specific prior written permission.  *  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES  * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND  * NONINFRINGEMENT. IN NO EVENT SHALL THE CONTIBUTORS OR COPYRIGHT  * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  * ________________________________________________________________ * National Laboratory for Applied Network Research  * National Center for Supercomputing Applications  * University of Illinois at Urbana-Champaign  * http://www.ncsa.uiuc.edu * ________________________________________________________________  * * gettimeofday.c * by Mark Gates <mgates@nlanr.net> * ------------------------------------------------------------------- * A (hack) implementation of gettimeofday for Windows. * Since I send sec/usec in UDP packets, this made the most sense. * ------------------------------------------------------------------- */#ifdef HAVE_CONFIG_H    #include "config.h"#endif#ifndef HAVE_GETTIMEOFDAY    #include "headers.h"    #include "gettimeofday.h"    #ifdef __cplusplusextern "C" {#endifint gettimeofday( struct timeval* tv, void* timezone ) {    FILETIME time;    double   timed;    GetSystemTimeAsFileTime( &time );    // Apparently Win32 has units of 1e-7 sec (tenths of microsecs)    // 4294967296 is 2^32, to shift high word over    // 11644473600 is the number of seconds between    // the Win32 epoch 1601-Jan-01 and the Unix epoch 1970-Jan-01    // Tests found floating point to be 10x faster than 64bit int math.    timed = ((time.dwHighDateTime * 4294967296e-7) - 11644473600.0) +            (time.dwLowDateTime  * 1e-7);    tv->tv_sec  = (long) timed;    tv->tv_usec = (long) ((timed - tv->tv_sec) * 1e6);    return 0;}#ifdef __cplusplus} /* end extern "C" */    #endif#endif /* HAVE_GETTIMEOFDAY */