linux网络编程socket.pdf

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1、网络编程的流程：客户端：1、创建一个 socket；2、绑定 socket(IP，端口号)；因为在 connect()中已经绑定了，所以不需要用blind()函数来绑定。serv_addr.sin_family=AF_INET;serv_addr.sin_port=htons(MYPORT);/端口号也就是进程，相当于应用程序的编号。端口号要与服务端的一致，所以绑定的端口号是服务端的端口号serv_addr.sin_addr.s_addr=inet_addr(IP);/绑定的 IP 是本机的 IP 3、发送建立连接请求connect()；4、收到连接响应；5、发送数据 send();6、关闭

2、socket,close(sock_fd)。服务端端：1、创建一个 socket；2、绑定 socket(IP，端口号)，blind()；my_addr.sin_family=AF_INET;my_addr.sin_port=htons(MYPORT);/绑定的端口号是自己的端口号my_addr.sin_addr.s_addr=INADDR_ANY;/IP 是客户端任意一个IP3、侦听来自客户端的连接请求，listen()；4、有客户端连接请求，为建立请求的客户端创建一个socket，返回连接响应，accept()；5、接受客户端发送的数据，recv()；6、关闭，close(new_fd)。

3、#include#include#include#include#include#include#include#include#define MYPORT 3999/listening port#define BACKLOG 10/max connect requests#define MAXDATASIZE 100/*max data volume*/#define IP 127.0.0.1 main(int argc,char*argv)int sock_fd,numbytes;/char*buf;/buf=(char*)malloc(20);char buf20;struct host

4、ent*host;struct sockaddr_in serv_addr;/*socket*/if(sock_fd=socket(AF_INET,SOCK_STREAM,0)=-1)perror(socket creat error);exit(1);serv_addr.sin_family=AF_INET;serv_addr.sin_port=htons(MYPORT);/serv_addr.sin_addr=inet_addr(IP);serv_addr.sin_addr.s_addr=inet_addr(IP);bzero(&(serv_addr.sin_zero),8);/*conn

5、ect*/if(connect(sock_fd,(struct sockaddr*)&serv_addr,sizeof(struct sockaddr)=-1)perror(connect error);exit(1);printf(Please enter the string:n);gets(buf);/*send*/if(numbytes=send(sock_fd,buf,strlen(buf),0)=-1)perror(send error);exit(1);printf(send:%dn,numbytes);close(sock_fd);exit(0);#include#includ

6、e#include#include#include#include#include#include#define MYPORT 3999 /listening port#define BACKLOG 10/max connect requests#define MAXDATASIZE 100 /*max data volume*/main()int sock_fd,new_fd,numbytes;/*sock_fd：listening socket；new_fd：data socket*/struct sockaddr_in my_addr;/*server address*/struct s

7、ockaddr_in their_addr;/*client address*/int sin_size;char bufMAXDATASIZE;/*创建 socket*/if(sock_fd=socket(AF_INET,SOCK_STREAM,0)=-1)perror(socket create error);exit(1);my_addr.sin_family=AF_INET;my_addr.sin_port=htons(MYPORT);my_addr.sin_addr.s_addr=INADDR_ANY;bzero(&(my_addr.sin_zero),8);if(bind (soc

8、k_fd,(struct sockaddr*)&my_addr,sizeof(struct sockaddr)=-1)perror(bind error);exit(1);printf(bind successn);if(listen(sock_fd,BACKLOG)=-1)perror(listen error);exit(1);/*accept*/while(1)sin_size=sizeof(struct sockaddr_in);if(new_fd=accept(sock_fd,(struct sockaddr*)&their_addr,&sin_size)=-1)perror(accept error);continue;printf(received a connect from:%sn,inet_ntoa(their_addr.sin_addr);if(numbytes=recv(new_fd,buf,MAXDATASIZE,0)=-1)perror(recv error);exit(1);bufnumbytes=0;printf(Received:%sn,buf);close(new_fd);