- unsigned long __copy_to_user(void __user * to, const void * from, unsigned long n);
- Destination address, in user space.
- Source address, in kernel space.
- Number of bytes to copy.
User context only. This function may sleep.
Copy data from kernel space to user space. Caller must check the specified block with access_ok before calling this function.
Returns number of bytes that could not be copied. On success, this will be zero.