1 /*---------------------------------------------------------------
2 * Copyright (c) 1999,2000,2001,2002,2003
3 * The Board of Trustees of the University of Illinois
5 *---------------------------------------------------------------
6 * Permission is hereby granted, free of charge, to any person
7 * obtaining a copy of this software (Iperf) and associated
8 * documentation files (the "Software"), to deal in the Software
9 * without restriction, including without limitation the
10 * rights to use, copy, modify, merge, publish, distribute,
11 * sublicense, and/or sell copies of the Software, and to permit
12 * persons to whom the Software is furnished to do
13 * so, subject to the following conditions:
16 * Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and
18 * the following disclaimers.
21 * Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimers in the documentation and/or other materials
24 * provided with the distribution.
27 * Neither the names of the University of Illinois, NCSA,
28 * nor the names of its contributors may be used to endorse
29 * or promote products derived from this Software without
30 * specific prior written permission.
32 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
33 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
34 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
35 * NONINFRINGEMENT. IN NO EVENT SHALL THE CONTIBUTORS OR COPYRIGHT
36 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
37 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
38 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE
39 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 * ________________________________________________________________
41 * National Laboratory for Applied Network Research
42 * National Center for Supercomputing Applications
43 * University of Illinois at Urbana-Champaign
44 * http://www.ncsa.uiuc.edu
45 * ________________________________________________________________
48 * by Mark Gates <mgates@nlanr.net>
49 * -------------------------------------------------------------------
50 * A (hack) implementation of gettimeofday for Windows.
51 * Since I send sec/usec in UDP packets, this made the most sense.
52 * ------------------------------------------------------------------- */
58 #ifndef HAVE_GETTIMEOFDAY
61 #include "gettimeofday.h"
67 int gettimeofday( struct timeval* tv, void* timezone ) {
71 GetSystemTimeAsFileTime( &time );
73 // Apparently Win32 has units of 1e-7 sec (tenths of microsecs)
74 // 4294967296 is 2^32, to shift high word over
75 // 11644473600 is the number of seconds between
76 // the Win32 epoch 1601-Jan-01 and the Unix epoch 1970-Jan-01
77 // Tests found floating point to be 10x faster than 64bit int math.
79 timed = ((time.dwHighDateTime * 4294967296e-7) - 11644473600.0) +
80 (time.dwLowDateTime * 1e-7);
82 tv->tv_sec = (long) timed;
83 tv->tv_usec = (long) ((timed - tv->tv_sec) * 1e6);
89 } /* end extern "C" */
92 #endif /* HAVE_GETTIMEOFDAY */