_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 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 if pagefaults are enabled.

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 4.8.                 January 2017                          _COPY_TO_USER(9)