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 2.6. July 2015 COPY_FROM_USER(9)