linux进程的管道通信

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

int main() {
    int pipefd[2];
    pid_t pid;
    char buffer[256];

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

    pid = fork();
    if (pid < 0) {
        perror("fork");
        exit(EXIT_FAILURE);
    } else if (pid == 0) {
        close(pipefd[1]);  // 关闭写端
        read(pipefd[0], buffer, sizeof(buffer));
        printf("子进程收到数据：%s
", buffer);
        close(pipefd[0]);
    } else {
        close(pipefd[0]);  // 关闭读端
        write(pipefd[1], "Hello from parent!", 18);
        close(pipefd[1]);
    }

    return 0;
}