Linux 网络编程 简单实例

一、编写Linux下socket协议TCP的ClientServer程序

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//客户端,client:



#include<stdio.h>

#include<unistd.h>

#include<stdlib.h>

#include<sys/socket.h>

#include<sys/stat.h>

#include<arpa/inet.h>

#define MAXBUF 256

int main()

{

int ssock;

int clen;

struct sockaddr_in server_addr;

char buf[MAXBUF];

if((ssock=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP))<0){

perror("socket error:");

exit(1);

}

clen = sizeof(server_addr);

memset(&server_addr,0,sizeof(server_addr));

server_addr.sin_family =AF_INET;

server_addr.sin_addr.s_addr=inet_addr("127.0.0.1");

server_addr.sin_port =htons(7758);

if(connect(ssock,(struct sockaddr *)&server_addr,clen)<0){

perror("connect error:");

exit(1);

}

memset(buf,0,MAXBUF);

if(read(ssock,buf,MAXBUF)<=0)

{

perror("read error:");

exit(1);

}

close(ssock);

printf("\nread: %s\n",buf);

return 0;

}

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//服务端,server:



#include<stdio.h>

#include<unistd.h>

#include<stdlib.h>

#include<string.h>

#include<sys/socket.h>

#include<sys/stat.h>

#include<arpa/inet.h>

#define MAXBUF 256

int main()

{

int clen;

int ssock,csock;

struct sockaddr_in client_addr,server_addr;

char buf[MAXBUF];

if((ssock=socket(PF_INET,SOCK_STREAM,IPPROTO_TCP))<0){

perror("socket error:");

exit(1);

}

clen = sizeof(client_addr);

memset(&server_addr,0,sizeof(server_addr));

server_addr.sin_family =AF_INET;

server_addr.sin_addr.s_addr=htonl(INADDR_ANY);<p> server_addr.sin_port=htons(7758);

if(bind(ssock,(struct sockaddr *)&server_addr,sizeof(server_addr))<0){

perror("bind error");

exit(1);

}

if(listen(ssock,8)<0){

perror("listen error:");

exit(1);

}

while(1){

csock=accept(ssock,(struct sockaddr *)&client_addr,&clen);

if(write(csock,buf, MAXBUF)<=0)

perror("write error:");

close(csock);

}

return 0;

}

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二、编写Linux下的socket协议UDP Client/Server程序

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//客户端,client:



#include<stdio.h>

#include<unistd.h>

#include<stdlib.h>

#include<string.h>

#include<sys/socket.h>

#include<sys/stat.h>

#include<arpa/inet.h>

#define MAXBUF 256

int main()

{

int ssock;

int clen;

struct sockaddr_in client_addr,server_addr;

char buf[MAXBUF];

strcpy(buf,"I miss you already!\n");

if((ssock = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP))<0){

perror("socket error:\n");

exit(1);

}

memset(&server_addr,0,sizeof(server_addr));

server_addr.sin_family =AF_INET;

server_addr.sin_addr.s_addr=inet_addr("127.0.0.1");

server_addr.sin_port=htons(7758);

sendto(ssock,(void *)buf,MAXBUF,0,(struct sockaddr*)&server_addr,sizeof(server_addr));

printf("Send message:%s\n",buf);

clen=sizeof(client_addr);

recvfrom(ssock,(void *)buf,MAXBUF,0,(struct sockaddr*)&server_addr,&clen);

printf("Receive message:%s\n",buf);

close(ssock);

return 0;

}

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//服务端,server:



#include<stdio.h>

#include<unistd.h>

#include<stdlib.h>

#include<string.h>

#include<sys/socket.h>

#include<sys/stat.h>

#include<arpa/inet.h>

#define MAXBUF 256

int main()

{

int ssock;

int clen;

struct sockaddr_in client_addr,server_addr;

char buf[MAXBUF];

if((ssock=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP))<0){

perror("socket error:");

exit(1);

}

memset(&server_addr,0,sizeof(server_addr));

server_addr.sin_family=AF_INET;

server_addr.sin_addr.s_addr=htonl(INADDR_ANY);

server_addr.sin_port=htons(7758);

if(bind(ssock,(struct sockaddr *)&server_addr,sizeof(server_addr))<0){

perror("bind error:");

exit(1);

}

clen=sizeof(client_addr);

recvfrom(ssock,(void *)buf,MAXBUF,0,(struct sockaddr*)&client_addr,&clen);

strcpy(buf,"I miss you");

sendto(ssock,(void *)buf,MAXBUF,0,(struct sockaddr*)&client_addr ,sizeof(client_addr));

close(ssock);

return 0;

}

from： http://blog.csdn.net/silentpebble/article/details/7077161