linux创建匿名管道

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

int main() {
    int pipefd[2];
    pid_t cpid;
    char buf[100];

    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\n", buf);

        close(pipefd[0]);
    } else {            // 父进程
        close(pipefd[0]);  // 关闭读端

        write(pipefd[1], "Hello, child process!", strlen("Hello, child process!"));

        close(pipefd[1]);
    }

    return 0;
}