Aborts an I/O operation.

Err AbortIO( Item ior )

This procedure aborts an I/O operation. If the I/O operation has already completed, calling AbortIO() has no effect. If it is not complete, it will be aborted.

A task should call WaitIO() immediately after calling AbortIO(). When WaitIO() returns, the task knows that the I/O operation is no longer active. It can then confirm that the I/O operation was aborted before it was finished by checking the io_Error field of the IOReq structure. If the operation aborted, the value of this field is ER_Aborted.

• ior The item number of the I/O request to abort.

The procedure returns 0 if the I/O operation was successfully aborted or an error code (a negative value) if an error occurs. Possible error codes include:

• BADITEM The ior argument is not an IOReq.

• NOTOWNER The ior argument is an IOReq but the calling task is not its owner.

SWI implemented in kernel folio V20.

• io.h ANSI C Prototype

CheckIO(), CreateIOReq(), DeleteIOReq(), DoIO(), SendIO(), WaitIO()