简单的linux下C编写的聊天室C-Sdemo

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 tcp_client.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
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<stdio.h>
#include<stdlib.h>
#include<string.h>
#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