_COPY_FROM_USER(9) Memory Management in Linux _COPY_FROM_USER(9)
NAME
_copy_from_user - Copy a block of data from user space.
SYNOPSIS
unsigned long _copy_from_user(void * to, const void __user * from, unsigned long n);
ARGUMENTS
to
Destination address, in kernel space.
from
Source address, in user space.
n
Number of bytes to copy.
CONTEXT
User context only. This function may sleep.
DESCRIPTION
Copy data from user space to kernel space.
Returns number of bytes that could not be copied. On success, this will be zero.
If some data could not be copied, this function will pad the copied data to the requested size using zero bytes.
COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 _COPY_FROM_USER(9)
