CLEAR_USER(9) Memory Management in Linux CLEAR_USER(9)
NAME clear_user - Zero a block of memory in user space.
SYNOPSIS unsigned long clear_user(void __user * to, unsigned long n);
ARGUMENTS to Destination address, in user space.
n Number of bytes to zero.
DESCRIPTION Zero a block of memory in user space.
Returns number of bytes that could not be cleared. On success, this will be zero.
COPYRIGHT Kernel Hackers Manual 2.6. July 2015 CLEAR_USER(9)