socket的编程过程（Internet Domain, stream type）

1）socket的组成，server 和 client

2）server部分的程序包括：

1. Create a socket with the socket() system call
   
2. Bind the socket to an address using the bind() system call. For a server socket on the Internet, an address consists of a port number on the host machine.
   
3. Listen for connections with the listen() system call
   
4. Accept a connection with the accept() system call. This call typically blocks until a client connects with the server.
   
5. Send and receive data

     client部分的程序包括：

1. Create a socket with the socket() system call
   
2. Connect the socket to the address of the server using the connect() system call
   
3. Send and receive data. There are a number of ways to do this, but the simplest is to use theread() andwrite() system calls.

3）socket建立的时候需要声明 address domain 和 socket type

     address domain: Unix domain----系统的入口（字符串）和端口号（可以选择2000到65535的任何一个数字）

                                Internet domain----IP地址和端口号

     socket type：stream sockets 用 TCP协议，是一种可靠的，基于stream的协议

                           datagram sockets 用UDP协议，是一种不可靠的，基于message的协议

4）例程，例程是Internet domain基于stream type的协议的c语言的源程序

server.c  http://www.linuxhowtos.org/data/6/server.c

client.c  http://www.linuxhowtos.org/data/6/client.c

关于例程的逐行解释，请移步源网址～

----------文章转自http://www.linuxhowtos.org/C_C++/socket.htm