CloseDevice

conclude access to a device

This function informs the device that access to a device/unit previously opened has been concluded. The device may perform certain house-cleaning operations.

The user must ensure that all outstanding IORequests have been returned before closing the device. The AbortIO() function may be able to terminate any stragglers in conjunction with CheckIO() and Wait().

After a close, the I/O request structure is free to be reused.

Starting with Kickstart 2.0 (V36) it is safe to call CloseDevice() with an IORequest that is either cleared to zeros, or failed to open.

iORequest

pointer to an I/O request structure

OpenDevice(), AbortIO(), CheckIO(), WaitIO()