#include "apue.h"intmain(void){	char	*ptr;	int		size;	if (chdir("/usr/spool/uucppublic") < 0)		err_sys("chdir failed");	ptr = path_alloc(&size);	/* our own function */	if (getcwd(ptr, size) == NULL)		err_sys("getcwd failed");	printf("cwd = %s\n", ptr);	exit(0);}