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45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
#if (defined _WIN32_) || (defined _MSC_VER)
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/*
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* missing gettimeofday implementation
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* for windows; based on postgresql
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*/
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#ifndef CUSTOM_WINDOWS_TIME_H_
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#define CUSTOM_WINDOWS_TIME_H_
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#define _WINSOCKAPI_ // stops windows.h including winsock.h; timeval redefine
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#include <Windows.h>
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#include <stdint.h> // portable: uint64_t MSVC: __int64
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// MSVC defines this in winsock2.h!?
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typedef struct timeval {
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long tv_sec;
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long tv_usec;
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} timeval;
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int gettimeofday(struct timeval * tp, struct timezone * tzp)
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{
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// Note: some broken versions only have 8 trailing zero's, the correct epoch has 9 trailing zero's
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// This magic number is the number of 100 nanosecond intervals since January 1, 1601 (UTC)
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// until 00:00:00 January 1, 1970
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static const uint64_t EPOCH = ((uint64_t) 116444736000000000ULL);
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SYSTEMTIME system_time;
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FILETIME file_time;
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uint64_t time;
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GetSystemTime( &system_time );
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SystemTimeToFileTime( &system_time, &file_time );
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time = ((uint64_t)file_time.dwLowDateTime ) ;
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time += ((uint64_t)file_time.dwHighDateTime) << 32;
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tp->tv_sec = (long) ((time - EPOCH) / 10000000L);
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tp->tv_usec = (long) (system_time.wMilliseconds * 1000);
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return 0;
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}
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#endif // CUSTOM_WINDOWS_TIME_H_
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#endif // _WIN32_
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