Linux下实现多进程Socket通信功能的示例代码

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

int main() {
    int server_fd, new_socket;
    struct sockaddr_in address;
    int addrlen = sizeof(address);

    // 创建TCP套接字
    server_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (server_fd == 0) {
        perror("Socket creation failed");
        exit(EXIT_FAILURE);
    }

    // 绑定地址和端口
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;  // 监听所有IP
    address.sin_port = htons(8080);        // 端口8080
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror("Bind failed");
        close(server_fd);
        exit(EXIT_FAILURE);
    }

    // 监听连接请求
    if (listen(server_fd, 10) < 0) {
        perror("Listen failed");
        close(server_fd);
        exit(EXIT_FAILURE);
    }

    printf("Server is listening on port 8080...\n");

    while (1) {
        // 接受客户端连接
        new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen);
        if (new_socket < 0) {
            perror("Accept failed");
            continue;
        }

        // 创建子进程处理连接
        pid_t pid = fork();
        if (pid < 0) {
            perror("Fork failed");
            close(new_socket);
            continue;
        } else if (pid == 0) {
            // 子进程：处理客户端请求
            char buffer[1024] = {0};
            read(new_socket, buffer, 1024);
            printf("Received from client: %s\n", buffer);

            // 发送响应
            const char *response = "Hello from server!";
            write(new_socket, response, strlen(response));
            close(new_socket);
            exit(0);  // 子进程结束
        } else {
            // 父进程：关闭新套接字，继续监听
            close(new_socket);
        }
    }

    // 关闭监听套接字
    close(server_fd);
    return 0;
}

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

int main() {
    int sock = 0;
    struct sockaddr_in serv_addr;

    // 创建套接字
    sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock < 0) {
        perror("Socket creation failed");
        exit(EXIT_FAILURE);
    }

    // 设置服务器地址
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(8080);
    serv_addr.sin_addr.s_addr = INADDR_ANY;

    // 连接服务器
    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        perror("Connection failed");
        close(sock);
        exit(EXIT_FAILURE);
    }

    // 发送请求
    const char *request = "Hello from client!";
    send(sock, request, strlen(request), 0);

    // 接收响应
    char buffer[1024] = {0};
    read(sock, buffer, 1024);
    printf("Server response: %s\n", buffer);

    // 关闭套接字
    close(sock);
    return 0;
}

#include <signal.h>

void sigchld_handler(int sig) {
    int status;
    while (waitpid(-1, &status, WNOHANG) > 0);  // 清理所有僵尸进程
}

// 在服务器主函数中注册信号处理
signal(SIGCHLD, sigchld_handler);