Skip to content

Instantly share code, notes, and snippets.

@mfilipelino

mfilipelino/time.c

Created October 15, 2015 15:31
Show Gist options
  • Save mfilipelino/4383de2e8d4af7ed43e7 to your computer and use it in GitHub Desktop.
Save mfilipelino/4383de2e8d4af7ed43e7 to your computer and use it in GitHub Desktop.
Download ZIP
Raw
time.c
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#include <stdint.h> // portable: uint64_t MSVC: __int64
// MSVC defines this in winsock2.h!?
typedef struct timeval {
long tv_sec;
long tv_usec;
} timeval;
int gettimeofday(struct timeval * tp, struct timezone * tzp)
{
// Note: some broken versions only have 8 trailing zero's, the correct epoch has 9 trailing zero's
static const uint64_t EPOCH = ((uint64_t) 116444736000000000ULL);
SYSTEMTIME system_time;
FILETIME file_time;
uint64_t time;
GetSystemTime( &system_time );
SystemTimeToFileTime( &system_time, &file_time );
time = ((uint64_t)file_time.dwLowDateTime ) ;
time += ((uint64_t)file_time.dwHighDateTime) << 32;
tp->tv_sec = (long) ((time - EPOCH) / 10000000L);
tp->tv_usec = (long) (system_time.wMilliseconds * 1000);
return 0;
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment