void sock_init(void)//网络栈初始化
{
 int i;

 printk("Swansea University Computer Society NET3.019\n");

 /*
  * Initialize all address (protocol) families.
  */
 
 for (i = 0; i < NPROTO; ++i) pops[i] = NULL;

 /*
  * Initialize the protocols module.
  */

 proto_init();

#ifdef CONFIG_NET
 /*
  * Initialize the DEV module.
  */

 dev_init();
 
 /*
  * And the bottom half handler
  */

 bh_base[NET_BH].routine= net_bh;//设置NET 下半部分的处理函数为net_bh
 enable_bh(NET_BH);
#endif 
}

void proto_init(void)
{
 extern struct net_proto protocols[]; /* Network protocols 全局变量，定义在protocols.c中*/
 struct net_proto *pro;

 /* Kick all configured protocols. */
 pro = protocols;
 while (pro->name != NULL) //对所有的定义的域进行初始化
 {
  (*pro->init_func)(pro);
  pro++;
 }
 /* We're all done... */
}