Windows下实现gettimeofday()函数

windows
#include <time.h>
#ifdef WIN32
#include <windows.h>
#else
#include <sys/time.h>
#endif
#ifdef WIN32
int gettimeofday(struct timeval *tp, void *tzp)
{
  time_t clock;
  struct tm tm;
  SYSTEMTIME wtm;
  GetLocalTime(&wtm);
  tm.tm_year   = wtm.wYear  - 1900;
  tm.tm_mon    = wtm.wMonth - 1;
  tm.tm_mday   = wtm.wDay;
  tm.tm_hour   = wtm.wHour;
  tm.tm_min    = wtm.wMinute;
  tm.tm_sec    = wtm.wSecond;
  tm.tm_isdst  = -1;
  clock = mktime(&tm);
  tp->tv_sec   = clock;
  tp->tv_usec  = wtm.wMilliseconds * 1000;
  return (0);
}
#endif