如何在C++中用pipe构建聊天程序

#include <iostream>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

int main() {
    int pipefd[2];
    pid_t pid;

    // 创建管道
    if (pipe(pipefd) == -1) {
        perror("pipe");
        exit(EXIT_FAILURE);
    }

    // 创建子进程
    pid = fork();

    if (pid == -1) {
        perror("fork");
        exit(EXIT_FAILURE);
    }

    if (pid == 0) {
        // 子进程，用于接收消息
        close(pipefd[1]);  // 关闭写端

        char buffer[1024];
        ssize_t bytesRead = read(pipefd[0], buffer, sizeof(buffer));

        if (bytesRead == -1) {
            perror("read");
            exit(EXIT_FAILURE);
        }

        std::cout << "接收到的消息: " << buffer << std::endl;

        close(pipefd[0]);  // 关闭读端
        exit(EXIT_SUCCESS);
    } else {
        // 父进程，用于发送消息
        close(pipefd[0]);  // 关闭读端

        std::string message = "Hello, child process!";
        ssize_t bytesWritten = write(pipefd[1], message.c_str(), message.length());

        if (bytesWritten == -1) {
            perror("write");
            exit(EXIT_FAILURE);
        }

        close(pipefd[1]);  // 关闭写端
        wait(NULL);  // 等待子进程结束
        exit(EXIT_SUCCESS);
    }

    return 0;
}