linux网络编程socket

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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IP3、发送建立连接请求con

2、nect()；4、收到连接响应；5、发送数据send();6、关闭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

3、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)。#include#include#include#include#include#include#include#include#defineMYPORT3999//listeningport#

4、defineBACKLOG10//maxconnectrequests#defineMAXDATASIZE100/*maxdatavolume*/#defineIP"127.0.0.1"main(intargc,char*argv[]){intsock_fd,numbytes;//char*buf;//buf=(char*)malloc(20);charbuf[20];structhostent*host;structsockaddr_inserv_addr;/*socket*/if((sock_fd=socket

5、(AF_INET,SOCK_STREAM,0))==-1){perror("socketcreaterror");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);/*connect*/if(connect(sock

6、_fd,(structsockaddr*)&serv_addr,sizeof(structsockaddr))==-1){perror("connecterror");exit(1);}printf("Pleaseenterthestring:");gets(buf);/*send*/if((numbytes=send(sock_fd,buf,strlen(buf),0))==-1){perror("senderror");exit(1);}printf("send:%d",numbytes);close(

7、sock_fd);exit(0);}#include#include#include#include#include#include#include#include#defineMYPORT3999//listeningport#defineBACKLOG10//maxconnectrequests#defineMAXDATASIZE1

8、00/*maxdatavolume*/main(){intsock_fd,new_fd,numbytes;/*sock_fd：listeningsocket；new_fd：datasocket*/structsockaddr_inmy_addr;/*serveraddress*/structsockaddr_intheir_addr;/*clientaddr