#include "apue.h"#include <fcntl.h>#define	DEPTH	100			/* directory depth */#define	MYHOME	"/home/sar"#define	NAME	"alonglonglonglonglonglonglonglonglonglongname"#define MAXSZ	8192intmain(void){	int		i, size;	char	*path;	if (chdir(MYHOME) < 0)		err_sys("chdir error");	for (i = 0; i < DEPTH; i++) {		if (mkdir(NAME, DIR_MODE) < 0)			err_sys("mkdir failed, i = %d", i);		if (chdir(NAME) < 0)			err_sys("chdir failed, i = %d", i);	}	if (creat("afile", FILE_MODE) < 0)		err_sys("creat error");	/*	 * The deep directory is created, with a file at the leaf.	 * Now let's try to obtain its pathname.	 */	path = path_alloc(&size);	for ( ; ; ) {		if (getcwd(path, size) != NULL) {			break;		} else {			err_ret("getcwd failed, size = %d", size);			size += 100;			if (size > MAXSZ)				err_quit("giving up");			if ((path = realloc(path, size)) == NULL)				err_sys("realloc error");		}	}	printf("length = %d\n%s\n", strlen(path), path);	exit(0);}