#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?

#define?HOSTLEN?256
#define?BACKLOG?10

int?make_server_socket_q（intint）;

int?make_server_socket（int?protnum）
{
????return?make_server_socket_q（protnumBACKLOG）;
}

int?make_server_socket_q（int?portnumint?backlog）
{
????struct?sockaddr_in?saddr;
????int?sock_id;
????//創建服務器socket
????sock_id=socket（PF_INET?SOCK_STREAM?0）;

????if（sock_id==-1）//失敗
????{
????????return?-1;
????}
????bzero（（void?*）&saddrsizeof（saddr））;
????saddr.sin_addr.s_addr=htonl（INADDR_ANY）;
????saddr.sin_port=htons（portnum）;
????saddr.sin_family=AF_INET;
????//綁定
????if（bind（sock_id（struct?sockaddr?*）&