写一个简单的聊天室，客户端发送消息，服务端回送发的消息的长度。
1.服务端代码 tcp_server.c
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<unistd.h>
#include<linux/in.h>
#define PORT 8888
#define BACKLOG 2 //侦听队列长度
int main(int argc , char *argv[]){
int ss,sc;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
int err;
pid_t pid;
ss = socket(AF_INET,SOCK_STREAM,0);
if(ss<0){
printf("socket error\n");
return -1;
}
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);//任意本地地址
server_addr.sin_port = htons(PORT);
err = bind(ss,(struct sockaddr *)&server_addr,sizeof(server_addr));
if(err<0){
printf("bind error\n");
return -1;
}
err = listen(ss,BACKLOG);
if(listen<0){
printf("listen error\n");
return -1;
}
for(;;){
int addrlen = sizeof(struct sockaddr);
sc = accept(ss,(struct sockaddr *)&client_addr,&addrlen);
if(sc<0){
continue;
}
pid = fork();
if(pid == 0){
close(ss);
process_conn_server(sc);
}
}
}
2.客户端代码
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<unistd.h>
#include<linux/in.h>
#define PORT 8888
int main(int argc , char *argv[]){
int s;
struct sockaddr_in server_addr;
int err;
s = socket(AF_INET , SOCK_STREAM, 0);
if(s<0){
printf("socker error\n");
return -1;
}
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(PORT);
inet_pton(AF_INET,argv[1],&server_addr.sin_addr);
connect(s,(struct sockaddr *)&server_addr,sizeof(struct sockaddr));
process_conn_client(s);
close(s);
}
3.服务端与客户端操作tcp_proccess.c
#include<sys/types.h>
void process_conn_server(int s){
ssize_t size = 0;
char buffer[1024];
for(;;){
size = read(s,buffer,1024);
if(size == 0){
return ;
}
sprintf(buffer,"%d bytes altogether\n",size);
write(s,buffer,strlen(buffer)+1);
}
}
void process_conn_client(int s){
ssize_t size = 0;
char buffer[1024];
for(;;){
size = read(0,buffer, 1024);
if(size>0){
write(s,buffer,size);
size = read(s,buffer,1024);
write(1,buffer,size);
}
}
}
4.写一个Makefile编译这三个文件
all:client server
client:tcp_proccess.o tcp_client.o
gcc -o client tcp_proccess.o tcp_client.o
server:tcp_proccess.o tcp_server.o
gcc -o server tcp_proccess.o tcp_server.o
tcp_proccess.o:tcp_proccess.c
gcc -c -o tcp_proccess.o tcp_proccess.c
tcp_client.o:tcp_client.c
gcc -c -o tcp_client.o tcp_client.c
tcp_server.o:tcp_server.c
gcc -c -o tcp_server.o tcp_server.c
clean:
rm -f client server *.o
5.输入make运行Makefile生成可执行文件。
6.先运行服务端./server
7.运行客户端./client 127.0.0.1
然后就可以在客户端输入内容了。
hello
6 bytes altogether
nihao
6 bytes altogether