2022-4-16 CGI服务器原理示例代码《Linux高性能服务器》笔记

服务端

#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<assert.h>
#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
#include<errno.h>
#include<string.h>
int main(void){
    
    
    //1.服务器端绑定
    struct sockaddr_in address;
    bzero(&address,sizeof(address));
    address.sin_family = AF_INET;
    address.sin_port = htons(9999);
    //inet_pton(AF_INET,"localhost",&address.sin_addr.s_addr);
    address.sin_addr.s_addr = INADDR_ANY;
    
    int sock = socket(AF_INET,SOCK_STREAM,0);
    if(sock == -1){
    
    
        perror("socket");
        return 1;
    }
    int ret = bind(sock,(struct sockaddr*)&address,sizeof(address));
    if(ret == -1){
    
    
        perror("bind");
        return -1;
    }
    //2.服务器端监听
    ret = listen(sock,5);
    if(ret == -1){
    
    
        perror("listen");
        return -1;
    }
    struct sockaddr_in client;
    socklen_t client_addrlength = sizeof(client);
    int connfd = accept(sock,(struct sockaddr*)&client,&client_addrlength);
    if(connfd == -1){
    
    
        perror("connect");
        exit(-1);
    }else {
    
    
        //输出客户端信息
        char clientIP[16];
        inet_ntop(AF_INET,&client.sin_addr.s_addr,clientIP,sizeof(clientIP));
        unsigned short clientPort = ntohs(client.sin_port);
        printf("client ip is %s, port is %d.\n",clientIP,clientPort);
        //使用函数的时候STDOUT_FILENO表示标准输出
        close(STDOUT_FILENO);
        dup(connfd);
        //关闭标准输出后，创建新的文件描述符会是最小的文件描述符，
        //这个时候再使用标准输入文件描述符会被定向到connfd文件描述符指向的地方
        printf("abcd\n");
        close(connfd);
    }
    close(sock);
    return 0;
}

客户端

//tcp 通信客户端
#include<stdio.h>
#include<arpa/inet.h>
#include<stdlib.h>
#include<unistd.h>
#include<string.h>

int main(void){
    
    
    //1.创建套接字
    int fd = socket(AF_INET,SOCK_STREAM,0);
    if(fd == -1){
    
    
        perror("socket");
        exit(0);
    }

    //2.连接服务器端
    struct sockaddr_in serveraddr;
    serveraddr.sin_family = AF_INET;
    inet_pton(AF_INET,"192.168.131.138",&serveraddr.sin_addr.s_addr);
    serveraddr.sin_port = htons(9999);
    int ret = connect(fd,(struct sockaddr*)&serveraddr,sizeof(serveraddr));
    if(ret == -1){
    
    
        perror("connect");
        exit(0);
    }

    //3.通信
    // char *data = "hello , i am client.";
    // write(fd,data,strlen(data));

    char recvBuf[1024] = {
    
    0}; 
    while(read(fd,recvBuf,sizeof(recvBuf)) > 0){
    
    
        printf("%s\n",recvBuf);
    }
    // int len2 = read(fd,recvBuf,sizeof(recvBuf));
    // if (len2 == -1)
    // {
    
    
    //     perror("read");
    //     exit(-1);
    // }
    // else if(len2 > 0){
    
    
    //     printf("recv client data : %s\n",recvBuf);

    // }else if(len2 == 0){
    
    
    //     //表示服务端断开连接
    //     printf("server closed.\n");
    // }
    close(fd);

    return 0;
}

服务端输出

客户端输出