socket的編程過程（Internet Domain, stream type）

1）socket的組成，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建立的時候需要聲明 address domain 和 socket type

     address domain: Unix domain----系統的入口（字符串）和端口號（可以選擇2000到65535的任何一個數字）

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

     socket type：stream sockets 用 TCP協議，是一種可靠的，基於stream的協議

                           datagram sockets 用UDP協議，是一種不可靠的，基於message的協議

4）例程，例程是Internet domain基於stream type的協議的c語言的源程序

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

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

關於例程的逐行解釋，請移步源網址～

----------文章轉自http://www.linuxhowtos.org/C_C++/socket.htm