📄 2_4网络代码阅读笔记(5) - china linux forum.htm
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<TD class=darktable rowSpan=2 vAlign=top width="17%"><A
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<TD align=left width="70%"><IMG height=15
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<P class=post>发信人: ysqcn (岁月无声), 信区: UKP <BR>标 题: 2.4网络代码阅读笔记(5)
<BR>发信站: UNIX编程 (2001年07月29日21:15:07 星期天), 站内信件
<BR><BR>下面分析sys_connect: <BR>asmlinkage long sys_connect(int fd,
struct sockaddr *uservaddr, int addrlen) <BR><BR>{ <BR>struct socket
*sock; <BR>char address[MAX_SOCK_ADDR]; <BR>int err; <BR>sock =
sockfd_lookup(fd, &err); <BR>if (!sock) <BR>goto out;
<BR>>>>>拷贝服务器地址结构 <BR>err =
move_addr_to_kernel(uservaddr, addrlen, address); <BR>if (err <
0) <BR>goto out_put; <BR>>>>>对TCP调用inet_stream_connect
<BR>err = sock->ops->connect(sock, (struct sockaddr *)
address, addrlen, <BR>sock->file->f_flags); <BR>out_put:
<BR>sockfd_put(sock); <BR>out: <BR>return err; <BR>} <BR>/* <BR>*
Connect to a remote host. There is regrettably still a little <BR>*
TCP 'magic' in here. <BR>*/ <BR>int inet_stream_connect(struct
socket *sock, struct sockaddr * uaddr, <BR>int addr_len, int flags)
<BR>{ <BR>struct sock *sk=sock->sk; <BR>int err; <BR>long timeo;
<BR>lock_sock(sk); <BR>.........................
<BR>>>>>根据socket的状态进行不同处理 <BR>switch (sock->state) {
<BR>default: <BR>err = -EINVAL; <BR>goto out;
<BR>>>>>连接已经建立 <BR>case SS_CONNECTED: <BR>err =
-EISCONN; <BR>goto out; <BR>>>>>正在建立连接 <BR>case
SS_CONNECTING: <BR>err = -EALREADY; <BR>/* Fall out of switch with
err, set for this state */ <BR>break; <BR>>>>>还没有建立连接
<BR>case SS_UNCONNECTED: <BR>err = -EISCONN; <BR>if (sk->state !=
TCP_CLOSE) <BR>goto out; <BR>err = -EAGAIN;
<BR>>>>>如果本地端口为0，则选择一个本地端口 <BR>if (sk->num == 0) {
<BR>if (sk->prot->get_port(sk, 0) != 0) <BR>goto out;
<BR>sk->sport = htons(sk->num); <BR>}
<BR>>>>>调用tcp_v4_connect，uaddr是用户传入的服务器的地址，置
<BR>>>>>TCP状态机为TCP_SYN_SEND <BR>err =
sk->prot->connect(sk, uaddr, addr_len); <BR>if (err < 0)
<BR>goto out; <BR>sock->state = SS_CONNECTING; <BR>/* Just
entered SS_CONNECTING state; the only <BR>* difference is that
return value in non-blocking <BR>* case is EINPROGRESS, rather than
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