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

int main(int argc, const char **argv)
{
	 int p;
	 int a = fork();
 	if (a>0) { // parent
		 p = getpid();
 		printf("parent ..: %d %d\n", p, a);
 	}
 	else if(a==0) { // child
 		p = getppid();
 		a = getpid();
 		printf("child ... :%d %d\n", p, a);
 	}
 	else {
 		printf("fork failed ..");
 		return -1;
 	}
 	return 0;
}