#include"my.h"

 #include<stdio.h>

 #include<stdlib.h>

 int main(){

     pid_t pid,ret;

     if((pid=fork())<){

         perror("fork ERROR!");

         return ;

     }else if(pid==){

         printf("%d：进程在运行\n",getpid());

         sleep();

         exit();

     }else if(pid>){

         do{

             ret=waitpid(pid,NULL,WNOHANG);

             if(ret==){

                 printf("the child prociess has no exited\n");

                 sleep();

             }

         }while(ret==);

         if(pid==ret){

             printf("child process exit\n");

         }

     }

     return ;

 }