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.