copy_to_user(9) suse man page | unix.com

COPY_TO_USER(9) 					    Memory Management in Linux						   COPY_TO_USER(9)

NAME
       copy_to_user - Copy a block of data into user space.

SYNOPSIS
       unsigned long copy_to_user(void __user * to, const void * from, unsigned long n);

ARGUMENTS
       to
	   Destination address, in user space.

       from
	   Source address, in kernel space.

       n
	   Number of bytes to copy.

CONTEXT
       User context only. This function may sleep.

DESCRIPTION
       Copy data from kernel space to user space.

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

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010							   COPY_TO_USER(9)