#ifndef _SYS_STAT_H#define _SYS_STAT_H#include <sys/types.h>struct stat {	dev_t	st_dev;	ino_t	st_ino;	umode_t	st_mode;	nlink_t	st_nlink;	uid_t	st_uid;	gid_t	st_gid;	dev_t	st_rdev;	off_t	st_size;	time_t	st_atime;	time_t	st_mtime;	time_t	st_ctime;};#define S_IFMT  00170000#define S_IFLNK	 0120000#define S_IFREG  0100000#define S_IFBLK  0060000#define S_IFDIR  0040000#define S_IFCHR  0020000#define S_IFIFO  0010000#define S_ISUID  0004000#define S_ISGID  0002000#define S_ISVTX  0001000#define S_ISLNK(m)	(((m) & S_IFMT) == S_IFLNK)#define S_ISREG(m)	(((m) & S_IFMT) == S_IFREG)#define S_ISDIR(m)	(((m) & S_IFMT) == S_IFDIR)#define S_ISCHR(m)	(((m) & S_IFMT) == S_IFCHR)#define S_ISBLK(m)	(((m) & S_IFMT) == S_IFBLK)#define S_ISFIFO(m)	(((m) & S_IFMT) == S_IFIFO)#define S_IRWXU 00700#define S_IRUSR 00400#define S_IWUSR 00200#define S_IXUSR 00100#define S_IRWXG 00070#define S_IRGRP 00040#define S_IWGRP 00020#define S_IXGRP 00010#define S_IRWXO 00007#define S_IROTH 00004#define S_IWOTH 00002#define S_IXOTH 00001extern int chmod(const char *_path, mode_t mode);extern int fstat(int fildes, struct stat *stat_buf);extern int mkdir(const char *_path, mode_t mode);extern int mkfifo(const char *_path, mode_t mode);extern int stat(const char *filename, struct stat *stat_buf);extern mode_t umask(mode_t mask);#endif