C fork/exec,带有非阻塞管道IO

#include<stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>

int main() {
    int pipefd[2];
    pid_t pid;
    char buffer[1024];

    // 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
        close(pipefd[1]); // 关闭写端
        read(pipefd[0], buffer, sizeof(buffer)); // 从管道中读取数据
        printf("Child process received: %s\n", buffer);
        close(pipefd[0]); // 关闭读端
        exit(EXIT_SUCCESS);
    } else {
        // 父进程
        close(pipefd[0]); // 关闭读端
        write(pipefd[1], "Hello, child process!", sizeof("Hello, child process!")); // 向管道中写入数据
        close(pipefd[1]); // 关闭写端
        wait(NULL); // 等待子进程结束
        printf("Parent process sent message to child process.\n");
        exit(EXIT_SUCCESS);
    }
}