CLEAR_USER(9) Memory Management in Linux CLEAR_USER(9)NAMEclear_user - Zero a block of memory in user space.
unsigned long clear_user(void __user * to, unsigned long n);
Destination address, in user space.
Number of bytes to zero.
Zero a block of memory in user space.
Returns number of bytes that could not be cleared. On success, this
will be zero.
COPYRIGHTKernel Hackers Manual 2.6. November 2013 CLEAR_USER(9)