#ifndef _SYS_TYPES_H#define _SYS_TYPES_H#ifndef _SIZE_T#define _SIZE_Ttypedef unsigned int size_t;#endif#ifndef _TIME_T#define _TIME_Ttypedef long time_t;#endif#ifndef _PTRDIFF_T#define _PTRDIFF_Ttypedef long ptrdiff_t;#endif#ifndef NULL#define NULL ((void *) 0)#endiftypedef int pid_t;typedef unsigned short uid_t;typedef unsigned char gid_t;typedef unsigned short dev_t;typedef unsigned short ino_t;typedef unsigned short mode_t;typedef unsigned short umode_t;typedef unsigned char nlink_t;typedef int daddr_t;typedef long off_t;typedef unsigned char u_char;typedef unsigned short ushort;typedef struct { int quot,rem; } div_t;typedef struct { long quot,rem; } ldiv_t;struct ustat {	daddr_t f_tfree;	ino_t f_tinode;	char f_fname[6];	char f_fpack[6];};#endif