📄 2_4网络代码阅读笔(4) - china linux forum.htm
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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: llkm <BR>标 题: 2.4网络代码阅读笔(4)
<BR>发信站: UNIX编程 (2001年06月15日16:14:03 星期五), 站内信件
<BR><BR>下面就是sys_accept的代码了: <BR><BR>asmlinkage long sys_accept(int
fd, struct sockaddr *upeer_sockaddr, int *upe <BR>er_addrlen) <BR>{
<BR>struct socket *sock, *newsock; <BR>int err, len; <BR>char
address[MAX_SOCK_ADDR]; <BR>sock = sockfd_lookup(fd, &err);
<BR>if (!sock) <BR>goto out; <BR>err = -EMFILE;
<BR>>>>>新分配一个struct socket结构 <BR>if (!(newsock =
sock_alloc())) <BR>goto out_put; <BR>newsock->type =
sock->type; <BR>newsock->ops = sock->ops;
<BR>>>>>传入newsock，调用inet_accept <BR>err =
sock->ops->accept(sock, newsock, sock->file->f_flags);
<BR>if (err < 0) <BR>goto out_release;
<BR>>>>>如果accept传入了一个对方地址结构变量. <BR>if (upeer_sockaddr) {
<BR>>>>>调用inet_getname,如果连接已经建立,则将newsock->sk中的目的地址传入
<BR>>>>>到address结构中.如果连接没有建立,则返回-ENOTCONN错误,从而下面关闭
<BR>>>>>这个套接字.
<BR>if(newsock->ops->getname(newsock, (struct sockaddr
*)address, &len, 2)<0) <BR>{ <BR>err = -ECONNABORTED;
<BR>goto out_release; <BR>} <BR>err = move_addr_to_user(address,
len, upeer_sockaddr, upeer_addrlen); <BR>if (err < 0) <BR>goto
out_release; <BR>} <BR>/* File flags are not inherited via accept()
unlike another OSes. */
<BR>>>>>分配文件系统层的操作例程，例如分配一个file结构和dentry结构，然后
<BR>>>>>将它们与sock联系起来,如下： <BR>>>>>
file->f_dentry = d_alloc(sock_mnt->mnt_sb->s_root,
&this); <BR>>>>> .................
<BR>>>>> file->f_dentry->d_op =
&sockfs_dentry_operations; <BR>>>>>
d_add(file->f_dentry, sock->inode); <BR>>>>>
file->f_vfsmnt = mntget(sock_mnt); <BR>>>>>
<BR>>>>> sock->file = file; <BR>>>>>
file->f_op = sock->inode->i_fop = &socket_file_ops;
<BR>if ((err = sock_map_fd(newsock)) < 0) <BR>goto out_release;
<BR>out_put: <BR>sockfd_put(sock); <BR>out: <BR>return err;
<BR>out_release: <BR>sock_release(newsock); <BR>goto out_put; <BR>}
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