Specifications

OpenVMS System Routines Called by OpenVMS AXP Device Drivers
IOC$UNMAP_IO
IOC$UNMAP_IO
Unmaps a previously mapped I/O address space, returning the IOHANDLE and
the PTEs to the system. The caller’s quadword cell containing the IOHANDLE is
cleared.
Description
The routine prototype is as follows:
int ioc$unmap_io (ADP *adp,
uint64 *iohandle)
A–32