Linux socket网络编程-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_54553206/article/details/132172382

本文详细介绍了网络编程中服务器端和客户端使用socket进行通信的过程，包括socket创建、绑定、监听、接受连接、数据收发及关闭连接的步骤。

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网络编程socket套接字

服务器端
客户端
总结

服务器端

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main()
{
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd == -1)
    {
        exit(1);
    }

    struct sockaddr_in saddr, caddr;
    memset(&saddr, 0, sizeof(saddr));
    saddr.sin_family = AF_INET;
    saddr.sin_port = htons(6000);
    saddr.sin_addr.s_addr = inet_addr("127.0.0.1");

    int res = bind(sockfd, (struct sockaddr *)&saddr, sizeof(saddr));
    if (res == -1)
    {
        printf("bind err\n");
        exit(1);
    }
    res = listen(sockfd, 5);
    if (res == -1)
    {
        exit(1);
    }
    while (1)
    {
        socklen_t len = sizeof(caddr);
        int c = accept(sockfd, (struct sockaddr *)&caddr, &len);
        if (c < 0)
        {
            continue;
        }
        printf("connect c = %d\n", c);
        while (1)
        {
            char buff[128] = {0};
            int n =recv(c, buff, sizeof(buff), 0);
            if(n==0){
            	break;
            }
            printf("buff = %s\n", buff);
            send(c, "ok", 2, 0);
        }
        close(c);
    }
}

服务端步骤:
1.socket() 创建监听套接字
2.bind() 绑定端口和ip
3.lsiten()使用监听套接字建立监听窗口个数
4.accetp()接收连接请求，建立连接
5.recv()接收信息
6.send()发送信息
7.close()关闭监听套接字

客户端

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main()
{
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd == -1)
    {
        exit(1);
    }

    struct sockaddr_in saddr;
    memset(&saddr, 0, sizeof(saddr));
    saddr.sin_family = AF_INET;
    saddr.sin_port = htons(6000);
    saddr.sin_addr.s_addr = inet_addr("127.0.0.1");

    int res = connect(sockfd, (struct sockaddr *)&saddr, sizeof(saddr));
    if (res == -1)
    {
        printf("connect err\n");
        exit(1);
    }
    while (1)
    {
        char buff[128] = {0};
        fgets(buff, 127, stdin);
        send(sockfd, buff, sizeof(buff), 0);
        memset(buff,0,sizeof(buff));
        recv(sockfd, buff, sizeof(buff), 0);
        printf("buff=%s\n", buff);
    }
    close(sockfd);  
}