uaccess.h

GNU Hurd 源代码

#ifndef _HACK_ASM_UACCESS_H_
#define _HACK_ASM_UACCESS_H_

#include <linux/mm.h>


#define MAKE_MM_SEG(s)	XXX
#define KERNEL_DS	XXX
#define USER_DS		XXX

#define get_ds()	XXX
#define get_fs()	XXX
#define set_fs(x)	XXX

#define segment_eq(a,b)	XXX

extern int __verify_write(const void *, unsigned long);
#define __verify_write	XXX

#define __addr_ok(addr)			(1)
#define __range_ok(addr,size)		(1)
#define access_ok(type,addr,size) 	(1)

#define put_user(x,ptr) (*(ptr) = (x), 0)
#define get_user(x,ptr) ((x) = *(ptr), 0)
#define __get_user(x,ptr) get_user((x), (ptr))

/* This is used to constitute an arbitrarily-sized memory clobber in an asm. */
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct *)(x))


/*
 * The "xxx_ret" versions return constant specified in third argument, if
 * something bad happens. These macros can be optimized for the
 * case of just returning from the function xxx_ret is used.
 */

#define put_user_ret(x,ptr,ret) ({ if (put_user(x,ptr)) return ret; })

#define get_user_ret(x,ptr,ret) ({ if (get_user(x,ptr)) return ret; })


#define copy_to_user(to,from,n)		(memcpy ((to), (from), (n)), 0)
#define copy_from_user(to,from,n)	(memcpy ((to), (from), (n)), 0)
#define	clear_user(mem, len)		(bzero ((mem), (len)), 0)

#define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n)) return retval; })

#define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n)) return retval; })


#endif