Linux socket多线程实现回声服务器

服务端

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

#define CONNNUM 10

int fd_connect[CONNNUM] = {0}; // 连接描述符数组


int fd_sock; // 套接字描述符

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; // 互斥锁

// 服务器初始化
void server_init(short port); 

// 服务器运行
void server_run();

// 服务器结束
void server_end();

// 数据处理
void *data_handle(int fd_conn);

// 线程入口函数
void *thread_func(void *arg);

int main(int argc, char const *argv[])
{
    if (argc != 2)
    {
        fprintf(stderr, "Usage: %s <server-port>\n", argv[0]);
        return 1;
    }

    server_init(atoi(argv[1]));

    server_run();

    server_end();

    return 0;
}

// 服务器端初始化
void server_init(short port)
{
     // 创建套接字
    fd_sock = socket(AF_INET, SOCK_STREAM, 0);
    if (fd_sock == -1)
    {
        perror("socket");
        exit(1);
    }

    // 准备通信地址
    struct sockaddr_in addr;
    addr.sin_family = AF_INET;
    addr.sin_port = htons(port);
    addr.sin_addr.s_addr = htonl(INADDR_ANY);

    // 绑定
    int res = bind(fd_sock, (const struct sockaddr *)&addr, sizeof(addr));
    if (res == -1)
    {
        perror("bind");
        exit(1);
    }
    printf("bind success!\n");

    // 监听
    res = listen(fd_sock, 10);
    if (res == -1)
    {
        perror("listen");
        exit(1);
    }

    printf("server init success!\n");
}

// 服务器端运行
void server_run()
{
    while (1)
    {
        // 接收连接
        int fd_conn = accept(fd_sock, NULL, NULL);
        if (fd_conn == -1)
        {
            perror("accept");
            exit(1);
        }

        printf("new connection!\n");
        pthread_t tid; // 创建新线程
        int res = pthread_create(&tid, NULL, thread_func, (void *)(long)fd_conn);
        if (res != 0)
        {
            errno = res;
            perror("pthread_creat");
            exit(1);
        }

        // 设置线程属性为分离
        pthread_detach(tid);
        // pid_t pid = fork(); // 创建子进程
        // if (pid == -1)
        // {
        //     perror("fork");
        //     exit(1);
        // }
        // else if (pid == 0) // 子进程
        // {
        //     // 数据处理
        //     data_handle(fd_conn);
        //     exit(0);
        // }
        
    }

}

// 数据处理
void *data_handle(int fd_conn)
{
    // 修改连接描述符数组
    int index;
    pthread_mutex_lock(&mutex);
    for (int i = 0; i < 10; i++)
    {
        if (fd_connect[i] == 0)
        {
            fd_connect[i] = fd_conn;
            index = i;
            break;
        } 
    }
    pthread_mutex_unlock(&mutex);

    // 接收数据
    char str[512] = {0};
    struct sockaddr_in client_addr;
    socklen_t addrlen = sizeof(client_addr);
    getpeername(fd_conn, (struct sockaddr *)&client_addr, &addrlen);
    printf("[%s : %d]  online!\n", inet_ntoa(client_addr.sin_addr), client_addr.sin_port);
    while (1)
    {
        int r = read(fd_conn, str, sizeof(str));
        if (r == -1)
        {
            perror("recv cilent");
            exit(1);
        }
        else if (r == 0) // 对端关闭连接
        {
            break;
        }
        printf("recv data: %s\n", str);
        if (!strcmp(str, "end"))
            break;
        
        pthread_mutex_lock(&mutex);
        for (int i = 0; i < 10; i++) // 群发消息
        {
            if (fd_connect[i] != 0)
            {
                r = write(fd_connect[i], str, r);
                if (r == -1)
                {
                    perror("send cilent");
                    exit(1);
                }
            }
        }
        pthread_mutex_unlock(&mutex);
    }
    printf("[%s : %d]  offline!\n", inet_ntoa(client_addr.sin_addr), client_addr.sin_port);

    pthread_mutex_lock(&mutex);
    fd_connect[index] = 0;
    pthread_mutex_unlock(&mutex);

    close(fd_conn);
}

void server_end()
{
    close(fd_sock);
}

// 线程函数
void *thread_func(void *arg)
{
    int fd_conn = (long)arg;
    data_handle(fd_conn);
}

客户端

/*
 * @Descripttion: 
 * @version: 
 * @Author: Chilk
 * @Date: 2020-07-29 17:01:23
 * @LastEditors: Chilk
 * @LastEditTime: 2020-08-01 09:54:54
 */
#include <stdio.h>
#include <assert.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

int main(int argc, char const *argv[])
{

    //创建一个IPv4的流式套接字
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd == -1)
    {
        perror("socket error");
        exit(1);
    }

    struct sockaddr_in info;
    info.sin_family = AF_INET;
    // info.sin_port = htons(54321);
    info.sin_port = htons(atol(argv[2]));
    info.sin_addr.s_addr = inet_addr(argv[1]);
    // info.sin_addr.s_addr = htonl(INADDR_ANY);

    if (connect(sockfd, (const struct sockaddr *)(&info), sizeof(struct sockaddr)) == -1)
    {
        perror("connect error");
        exit(1);
    }
    printf("连接成功\n");

    while (1)
    {
        char buf[256];
        gets(buf);
        write(sockfd, buf, strlen(buf)+1);

        char rev_buf[256];
        read(sockfd, rev_buf, 254);
        printf("%s\n", rev_buf);
    }

    close(sockfd);
    return 0;
}