linux pipe 管道简单例子

linux pipe 管道简单例子

//
// Created by liyihang on 17-9-25.
//

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

int main(int argc, char *argv[])
{


    int pipe_fd[2];
    pid_t  child_pid;
    char pipe_buf;

    memset(pipe_fd, 0, sizeof(int)*2);

    if (pipe(pipe_fd)==-1){
        printf("open err\n");
        return -1;
    }

    child_pid=fork();
    if (child_pid==-1)
    {
        printf("thead err\n");
    }

    if (child_pid==0)
    {
        close(pipe_fd[1]);
        printf("while start\n");
        while (read(pipe_fd[0], &pipe_buf, 1)>0)
        {
//            write(STDOUT_FILENO, &pipe_buf, 1);
            printf("read content outs:%s\n", &pipe_buf);
        }
        close(pipe_fd[0]);
        printf("child thead ok\n");
        return 0;
    } else{
        close(pipe_fd[0]);
        write(pipe_fd[1], "h", 1);
        close(pipe_fd[1]);
        printf("father thaed ok\n");
//        wait(NULL);
        wait(&child_pid);
        printf("wait thread \n");
        return 0;
    }


}