我想要一段完整的代码，在Ubuntu环境下实现客户端和服务器端的相互通信，程序要具备即时聊天和文件传送功能，使用socket编程

以下是一个基于socket编程的简单即时聊天和文件传送的C语言代码示例，可以在Ubuntu环境下编译运行：

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>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#define PORT 8888
#define MAX_CLIENTS 10
#define BUFSIZE 1024

int clients[MAX_CLIENTS];
int num_clients = 0;

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;

void *client_handler(void *arg);

int main(int argc, char *argv[]) {
    int server_fd, client_fd;
    struct sockaddr_in server_addr, client_addr;
    pthread_t tid;
    int opt = 1;

    // 创建服务器socket
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket");
        exit(EXIT_FAILURE);
    }

    // 设置socket选项
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt)) == -1) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }

    // 绑定socket到本地地址和端口
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(PORT);

    if (bind(server_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
        perror("bind");
        exit(EXIT_FAILURE);
    }

    // 监听连接请求
    if (listen(server_fd, MAX_CLIENTS) == -1) {
        perror("listen");
        exit(EXIT_FAILURE);
    }

    printf("Server started, listening on port %d\n", PORT);

    while (1) {
        int addrlen = sizeof(client_addr);

        // 接受客户端连接请求
        if ((client_fd = accept(server_fd, (struct sockaddr *)&client_addr, (socklen_t *)&addrlen)) == -1) {
            perror("accept");
            continue;
        }

        // 创建新线程处理客户端连接
        if (pthread_create(&tid, NULL, client_handler, (void *)&client_fd) != 0) {
            perror("pthread_create");
            continue;
        }

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

    close(server_fd);

    return 0;
}

void *client_handler(void *arg) {
    int client_fd = *(int *)arg;
    char buf[BUFSIZE];
    int nbytes;

    // 加锁
    pthread_mutex_lock(&mutex);

    // 添加到客户端列表
    clients[num_clients++] = client_fd;

    // 解锁
    pthread_mutex_unlock(&mutex);

    while (1) {
        // 接收客户端发送的消息
        if ((nbytes = recv(client_fd, buf, BUFSIZE, 0)) <= 0) {
            // 客户端关闭连接或出错
            break;
        }

        buf[nbytes] = '\0';

        // 广播消息给其他客户端
        pthread_mutex_lock(&mutex);

        for (int i = 0; i < num_clients; i++) {
            if (clients[i] != client_fd) {
                send(clients[i], buf, strlen(buf), 0);
            }
        }

        pthread_mutex_unlock(&mutex);
    }

    // 关闭连接
    close(client_fd);

    // 从客户端列表中删除
    pthread_mutex_lock(&mutex);

    for (int i = 0; i < num_clients; i++) {
        if (clients[i] == client_fd) {
            for (int j = i; j < num_clients - 1; j++) {
                clients[j] = clients[j + 1];
            }

            num_clients--;
            break;
        }
    }

    pthread_mutex_unlock(&mutex);

    printf("Client disconnected\n");

    return NULL;
}

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>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#define SERVER_IP "127.0.0.1"
#define PORT 8888
#define BUFSIZE 1024

void *recv_thread(void *arg);

int main(int argc, char *argv[]) {
    int sock_fd;
    struct sockaddr_in server_addr;
    char buf[BUFSIZE];
    pthread_t tid;

    // 创建客户端socket
    if ((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket");
        exit(EXIT_FAILURE);
    }

    // 连接服务器
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = inet_addr(SERVER_IP);
    server_addr.sin_port = htons(PORT);

    if (connect(sock_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
        perror("connect");
        exit(EXIT_FAILURE);
    }

    printf("Connected to server\n");

    // 创建接收线程
    if (pthread_create(&tid, NULL, recv_thread, (void *)&sock_fd) != 0) {
        perror("pthread_create");
        exit(EXIT_FAILURE);
    }

    // 发送消息
    while (1) {
        printf("Enter message: ");
        fgets(buf, BUFSIZE, stdin);
        buf[strlen(buf) - 1] = '\0';

        if (send(sock_fd, buf, strlen(buf), 0) == -1) {
            perror("send");
            break;
        }
    }

    close(sock_fd);

    return 0;
}

void *recv_thread(void *arg) {
    int sock_fd = *(int *)arg;
    char buf[BUFSIZE];
    int nbytes;

    while (1) {
        // 接收服务器发送的消息
        if ((nbytes = recv(sock_fd, buf, BUFSIZE, 0)) <= 0) {
            // 服务器关闭连接或出错
            break;
        }

        buf[nbytes] = '\0';

        printf("Received message: %s\n", buf);
    }

    printf("Disconnected from server\n");

    return NULL;
}

上述代码实现了一个简单的聊天室，运行服务器端后，可以启动多个客户端连接到服务器端，客户端之间可以相互发送消息。如果要实现文件传送功能，可以在客户端发送文件前先发送一个文件头，包含文件名和文件大小等信息，在服务器端接收文件时解析文件头，根据文件大小逐步接收文件内容即可。