从c中的管道读取并打印到stdout

#include <stdio.h>
#include <unistd.h>

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

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

    // 创建子进程
    pid = fork();
    if (pid == -1) {
        perror("fork");
        return 1;
    }

    if (pid == 0) {
        // 子进程关闭读取端
        close(pipefd[0]);

        // 写入数据到管道
        char message[] = "Hello, World!";
        write(pipefd[1], message, sizeof(message));

        // 关闭写入端
        close(pipefd[1]);
    } else {
        // 父进程关闭写入端
        close(pipefd[1]);

        // 读取数据并打印到stdout
        char buffer[100];
        ssize_t bytesRead = read(pipefd[0], buffer, sizeof(buffer));
        if (bytesRead > 0) {
            printf("Received message: %s\n", buffer);
        }

        // 关闭读取端
        close(pipefd[0]);
    }

    return 0;
}