uaccess.h File Reference

#include <linux/thread_info.h>
#include <linux/errno.h>
#include <asm/memory.h>
#include <asm-generic/uaccess.h>

Go to the source code of this file.

Macros
#define	__copy_from_user   __copy_from_user
#define	__copy_to_user   __copy_to_user
#define	__strncpy_from_user   __strncpy_from_user
#define	__strnlen_user   __strnlen_user
#define	__clear_user   __clear_user
#define	__kernel_ok   (segment_eq(get_fs(), KERNEL_DS))
#define	__user_ok(addr, size)
#define	__access_ok(addr, size)   (__kernel_ok || __user_ok((addr), (size)))

Functions
unsigned long __must_check	__copy_from_user (void *to, const void __user *from, unsigned long n)
unsigned long __must_check	__copy_to_user (void __user *to, const void *from, unsigned long n)
unsigned long __must_check	__clear_user (void __user *addr, unsigned long n)
unsigned long __must_check	__strncpy_from_user (char *to, const char __user *from, unsigned long count)
unsigned long	__strnlen_user (const char __user *s, long n)
int	fixup_exception (struct pt_regs *regs)

Macro Definition Documentation

#define __access_ok	(		addr,
			size
	)		(__kernel_ok || __user_ok((addr), (size)))

Definition at line 29 of file uaccess.h.

#define __clear_user   __clear_user

Definition at line 24 of file uaccess.h.

#define __copy_from_user   __copy_from_user

Definition at line 20 of file uaccess.h.

#define __copy_to_user   __copy_to_user

Definition at line 21 of file uaccess.h.

#define __kernel_ok   (segment_eq(get_fs(), KERNEL_DS))

Definition at line 26 of file uaccess.h.

#define __strncpy_from_user   __strncpy_from_user

Definition at line 22 of file uaccess.h.

#define __strnlen_user   __strnlen_user

Definition at line 23 of file uaccess.h.

#define __user_ok	(		addr,
			size
	)

Value:

(((size) <= TASK_SIZE)          \
                && ((addr) <= TASK_SIZE - (size)))

Definition at line 27 of file uaccess.h.

Function Documentation

unsigned long __must_check __clear_user	(	void __user *	addr,
		unsigned long	size
	)

__clear_user: - Zero a block of memory in user space, with less checking. : Destination address, in user space.
: Number of bytes to zero.

Zero a block of memory in user space. Caller must check the specified block with access_ok() before calling this function.

Returns number of bytes that could not be cleared. On success, this will be zero.

Definition at line 158 of file uaccess_with_memcpy.c.

unsigned long __must_check __copy_from_user	(	void *	to,
		const void __user *	from,
		unsigned long	n
	)

unsigned long __must_check __copy_to_user	(	void __user *	to,
		const void *	from,
		unsigned long	n
	)

Definition at line 107 of file uaccess_with_memcpy.c.

unsigned long __must_check __strncpy_from_user	(	char *	to,
		const char __user *	from,
		unsigned long	count
	)

unsigned long __strnlen_user	(	const char __user *	s,
		long	n
	)

int fixup_exception

(

struct pt_regs *

regs

)

Definition at line 7 of file extable.c.