windows下类似与Linux下readv和writev的实现

 struct iovec{
     void *iov_base; 
     size_t iov_len; 
};
 
 static long sendv(int socket , struct iovec *iov , int count)
 {
     long totallen ,tlen = -1;
     while(count)
     {
         tlen = send(socket, (const char*)iov->iov_base,iov->iov_len,0);
         if(tlen < 0)
         return totallen;
         totallen+=tlen;
         iov++;
         count--;
     }
 }

int readv(int handle, struct iovec *iov, int count)
{
 
  long r, t=0;
  while (count)
  {
 
    r = read(handle, iov->iov_base, iov->iov_len);
    if (r < 0)
      return r;
    t += r;
    iov++;
    count--;
   
}