Linux进程通信编程

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题目：设计一个程序，要求创建一个管道，复制进程，父进程往管道中写入字符串“how are you!”，子进程从管道中读取并输入字符串“how are you!”。

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/wait.h>
#include<unistd.h>
#include<string.h>
int  main()
{
    pid_t result;
    int n;
    int pipe_fd[2];
    char buf1[100],buf2[100];
    memset(buf1,0,sizeof(buf1));
        if(pipe(pipe_fd)<0)
        {
            printf("error!\n");
            return -1;
        }
    result=fork();
    if(result<0)
    {
        printf("error!\n");
        exit(0);
    }
    else if(result==0)
    {
        close(pipe_fd[1]);
        if((n =read(pipe_fd[0],buf1,100))>0)
        {
            printf("child read %d char,char is %s\n",n,buf1);
            close(pipe_fd[0]);
            exit(0);
        }
    }
    else
    {
        close(pipe_fd[0]);
        printf("please input pipe word \n");
        fgets(buf2,sizeof(buf2),stdin);
        if(write(pipe_fd[1],buf2,strlen(buf2))!=-1)
            printf("parent write to child is: %s\n",buf2);
        close(pipe_fd[1]);
        waitpid(result,NULL,0);
        exit(0);
    }

    return 0;
}