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

int main() {
    int pipefd[2];
    pid_t cpid;
    char buf[256];

    if (pipe(pipefd) == -1) {
        perror("pipe");
        exit(EXIT_FAILURE);
    }

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

    if (cpid == 0) {    // 子进程
        close(pipefd[1]); // 关闭写端
        read(pipefd[0], buf, sizeof(buf));
        printf("子进程读取到: %s
", buf);
        close(pipefd[0]);
    } else {            // 父进程
        close(pipefd[0]); // 关闭读端
        write(pipefd[1], "Hello from parent!", strlen("Hello from parent!"));
        close(pipefd[1]);
    }

    return 0;
}