#include<stdio.h>
#include<unistd.h>
#include<stdlib.h>
int main()
{
pid_t pid;
pid = fork();
switch(pid){
case 1:
perror("fork");
exit(1);
case 0:
printf("child pid :%u\n",getpid());
exit(1);
default:
printf("parent pid :%u\n",getpid());
break;
}
return 0;
}