C语言多线程服务器客户端相互收发，并写出具体代码

好的，下面是一个简单的示例代码，实现了一个简单的多线程服务器和客户端之间的相互收发数据：

服务器端代码：

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

#define PORT 8000
#define MAX_CLIENTS 10
#define MAX_MSG_LENGTH 1024

int client_sockets[MAX_CLIENTS];  // 保存客户端套接字的数组

// 线程处理函数，用于与客户端进行通信
void *thread_func(void *arg) {
    int client_sock = *(int *)arg;
    char recv_buffer[MAX_MSG_LENGTH];
    char send_buffer[MAX_MSG_LENGTH];
    while (1) {
        // 接收客户端发送的数据
        memset(recv_buffer, 0, sizeof(recv_buffer));
        if (recv(client_sock, recv_buffer, sizeof(recv_buffer), 0) < 0) {
            perror("recv failed");
            close(client_sock);
            pthread_exit(NULL);
        }
        printf("Received message from client %d: %s\n", client_sock, recv_buffer);

        // 发送数据给客户端
        memset(send_buffer, 0, sizeof(send_buffer));
        snprintf(send_buffer, sizeof(send_buffer), "Hello, client %d", client_sock);
        if (send(client_sock, send_buffer, strlen(send_buffer), 0) < 0) {
            perror("send failed");
            close(client_sock);
            pthread_exit(NULL);
        }
    }
}

int main() {
    int server_sock, client_sock;
    struct sockaddr_in server_addr, client_addr;
    socklen_t client_addr_len;
    pthread_t thread_id;
    int i;

    // 创建服务器端套接字
    if ((server_sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // 设置服务器端地址结构体
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    server_addr.sin_addr.s_addr = INADDR_ANY;

    // 绑定服务器端套接字到指定地址和端口
    if (bind(server_sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    // 监听客户端连接请求
    if (listen(server_sock, MAX_CLIENTS) < 0) {
        perror("listen failed");
        exit(EXIT_FAILURE);
    }

    printf("Server started, waiting for clients...\n");

    // 接收客户端连接请求，并创建一个新线程来处理客户端请求
    while (1) {
        client_addr_len = sizeof(client_addr);
        if ((client_sock = accept(server_sock, (struct sockaddr *)&client_addr, &client_addr_len)) < 0) {
            perror("accept failed");
            continue;
        }

        // 将新连接的客户端套接字保存到数组中
        for (i = 0; i < MAX_CLIENTS; i++) {
            if (client_sockets[i] == 0) {
                client_sockets[i] = client_sock;
                break;
            }
        }

        if (i == MAX_CLIENTS) {
            printf("Too many clients, connection rejected.\n");
            close(client_sock);
            continue;
        }

        printf("New client connected: %s:%d, assigned ID %d\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port), i);

        // 创建一个新线程来处理该客户端请求
        if (pthread_create(&thread_id, NULL, thread_func, &client_sock) < 0) {
            perror("pthread_create failed");
            continue;
        }
        pthread_detach(thread_id);  // 分离线程
    }

    return 0;
}

客户端代码：

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

#define SERVER_ADDR "127.0.0.1"
#define PORT 8000
#define MAX_MSG_LENGTH 1024

// 线程处理函数，用于与服务器进行通信
void *thread_func(void *arg) {
    int server_sock = *(int *)arg;
    char recv_buffer[MAX_MSG_LENGTH];
    char send_buffer[MAX_MSG_LENGTH];
    while (1) {
        // 发送数据给服务器
        memset(send_buffer, 0, sizeof(send_buffer));
        snprintf(send_buffer, sizeof(send_buffer), "Hello, server");
        if (send(server_sock, send_buffer, strlen(send_buffer), 0) < 0) {
            perror("send failed");
            close(server_sock);
            pthread_exit(NULL);
        }

        // 接收服务器发送的数据
        memset(recv_buffer, 0, sizeof(recv_buffer));
        if (recv(server_sock, recv_buffer, sizeof(recv_buffer), 0) < 0) {
            perror("recv failed");
            close(server_sock);
            pthread_exit(NULL);
        }
        printf("Received message from server: %s\n", recv_buffer);

        sleep(1);  // 暂停1秒
    }
}

int main() {
    int server_sock;
    struct sockaddr_in server_addr;
    pthread_t thread_id;

    // 创建客户端套接字
    if ((server_sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // 设置服务器端地址结构体
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    if (inet_pton(AF_INET, SERVER_ADDR, &server_addr.sin_addr) <= 0) {
        perror("inet_pton failed");
        exit(EXIT_FAILURE);
    }

    // 连接服务器端套接字
    if (connect(server_sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("connect failed");
        exit(EXIT_FAILURE);
    }

    printf("Connected to server %s:%d\n", SERVER_ADDR, PORT);

    // 创建一个新线程来处理与服务器的通信
    if (pthread_create(&thread_id, NULL, thread_func, &server_sock) < 0) {
        perror("pthread_create failed");
        exit(EXIT_FAILURE);
    }

    while (1) {
        sleep(1);  // 暂停1秒
    }

    return 0;
}

上面的代码仅作为示例，实际使用时需要根据具体需求进行修改和优化。