用C语言socket通信，写一个聊天对话，互相可以发送文字

好的，以下是一个简单的C语言socket通信程序，可以实现聊天对话：

客户端代码：

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

#define SERVER_IP "127.0.0.1" // 服务器IP地址
#define SERVER_PORT 8080 // 服务器端口号
#define BUFFER_SIZE 1024 // 缓冲区大小

int main() {
    int client_socket; // 客户端套接字
    struct sockaddr_in server_addr; // 服务器地址

    // 创建客户端套接字
    client_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (client_socket < 0) {
        printf("Failed to create socket.\n");
        return -1;
    }

    // 初始化服务器地址
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(SERVER_PORT);
    if (inet_pton(AF_INET, SERVER_IP, &server_addr.sin_addr) <= 0) {
        printf("Invalid server IP address.\n");
        return -1;
    }

    // 连接服务器
    if (connect(client_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        printf("Failed to connect to server.\n");
        return -1;
    }

    // 发送和接收消息
    char buffer[BUFFER_SIZE];
    while (1) {
        // 发送消息
        printf("Enter message: ");
        fgets(buffer, BUFFER_SIZE, stdin);
        if (send(client_socket, buffer, strlen(buffer), 0) < 0) {
            printf("Failed to send message.\n");
            break;
        }

        // 接收消息
        memset(buffer, 0, BUFFER_SIZE);
        if (recv(client_socket, buffer, BUFFER_SIZE, 0) < 0) {
            printf("Failed to receive message.\n");
            break;
        }
        printf("Received message: %s", buffer);
    }

    // 关闭套接字
    close(client_socket);

    return 0;
}

服务器端代码：

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

#define SERVER_PORT 8080 // 服务器端口号
#define BUFFER_SIZE 1024 // 缓冲区大小

int main() {
    int server_socket, client_socket; // 服务器套接字和客户端套接字
    struct sockaddr_in server_addr, client_addr; // 服务器地址和客户端地址
    socklen_t client_addr_len = sizeof(client_addr); // 客户端地址长度

    // 创建服务器套接字
    server_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (server_socket < 0) {
        printf("Failed to create socket.\n");
        return -1;
    }

    // 初始化服务器地址
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    server_addr.sin_port = htons(SERVER_PORT);

    // 绑定服务器地址
    if (bind(server_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        printf("Failed to bind socket.\n");
        return -1;
    }

    // 监听连接请求
    if (listen(server_socket, 1) < 0) {
        printf("Failed to listen socket.\n");
        return -1;
    }

    // 接受连接请求
    client_socket = accept(server_socket, (struct sockaddr *)&client_addr, &client_addr_len);
    if (client_socket < 0) {
        printf("Failed to accept connection.\n");
        return -1;
    }

    // 发送和接收消息
    char buffer[BUFFER_SIZE];
    while (1) {
        // 接收消息
        memset(buffer, 0, BUFFER_SIZE);
        if (recv(client_socket, buffer, BUFFER_SIZE, 0) < 0) {
            printf("Failed to receive message.\n");
            break;
        }
        printf("Received message: %s", buffer);

        // 发送消息
        printf("Enter message: ");
        fgets(buffer, BUFFER_SIZE, stdin);
        if (send(client_socket, buffer, strlen(buffer), 0) < 0) {
            printf("Failed to send message.\n");
            break;
        }
    }

    // 关闭套接字
    close(client_socket);
    close(server_socket);

    return 0;
}

运行客户端和服务器端程序，客户端输入消息后，服务器端会输出接收到的消息，并等待输入回复消息，客户端会接收到服务器端的回复消息。