gettimeofday.c

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/* @(#)gettimeofday.c   1.9 12/11/29 Copyright 2007-2012 J. Schilling */
#include <schily/mconfig.h>
#ifndef lint
static  UConst char sccsid[] =
    "@(#)gettimeofday.c 1.9 12/11/29 Copyright 2007-2012 J. Schilling";
#endif
/*
 *  Emulate gettimeofday where it does not exist
 *
 *  Copyright (c) 2007-2012 J. Schilling
 */
/*
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * See the file CDDL.Schily.txt in this distribution for details.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file CDDL.Schily.txt from this distribution.
 */
 
#if !defined(HAVE_GETTIMEOFDAY)
#if (defined(_MSC_VER) || defined(__MINGW32__))
#include <schily/windows.h>
#include <schily/time.h>
#include <schily/utypes.h>
#include <schily/standard.h>
 
#ifdef  _MSC_VER
const   __int64 MS_FTIME_ADD    = 0x2b6109100i64;
const   __int64 MS_FTIME_SECS   = 10000000i64;
#else
const   Int64_t MS_FTIME_ADD    = 0x2b6109100LL;
const   Int64_t MS_FTIME_SECS   = 10000000LL;
#endif
 
EXPORT int
gettimeofday(tp, dummy)
    struct timeval  *tp;
    void        *dummy;     /* tzp is unspecified by POSIX */
{
    FILETIME    ft;
    Int64_t     T;
 
    if (tp == 0)
        return (0);
 
    GetSystemTimeAsFileTime(&ft);   /* 100ns time since 1601 */
    T   = ft.dwHighDateTime;
    T <<= 32;
    T  += ft.dwLowDateTime;
 
    /*
     * Cast to avoid a loss of data warning
     * MSVC uses long instead of time_t for tv_sec
     */
    tp->tv_sec  = (long) (T / MS_FTIME_SECS - MS_FTIME_ADD);
    tp->tv_usec = (long) (T % MS_FTIME_SECS) / 10;
 
    return (0);
}
#else   /* (defined(_MSC_VER) || defined(__MINGW32__)) */
 
#ifdef  HAVE_TIME
#include <schily/time.h>
#include <schily/standard.h>
 
EXPORT int
gettimeofday(tp, dummy)
    struct timeval  *tp;
    void        *dummy;     /* tzp is unspecified by POSIX */
{
    time_t  t;
 
    if (tp == 0)
        return (0);
 
    (void) time(&t);
    tp->tv_sec  = t;
    tp->tv_usec = 0;
 
    return (0);
}
#endif
 
#endif  /* (defined(_MSC_VER) || defined(__MINGW32__)) */
#endif  /* !defined(HAVE_GETTIMEOFDAY) */