#include <stdio.h>

int main()
{
	int childPid;

	if ((childPid = fork()) == -1)
	{
		fprint(stderr, "can't fork\n");
		exit(1);
	}
	else if (childPid == 0)
	{
		fprintf(stdout, "child: child pid = %d, parent pid = %d\n",
			getpid(), getppid());
		exit(0);
	}
	else
	{
		fprintf(stdout, "parent: child pid = %d, parent pid = %d\n",
			childPid, getpid());
		exit(0);

	}
}