设置tcp无等待算法，send直接发送发送数据

void reconf(int sck)
{
 int r = 0; long o = 1; socklen_t ol = sizeof(long);
 r = setsockopt(sck, IPPROTO_TCP, TCP_NODELAY, (char*)&o, ol);
 if (r == -1) 
  printf("setsockopt(nodelay)");
 else
  printf("socket shorten delay ok.\n"); 

}