OSI/AS Programming Manual

MFM_CANCELREQ_
Module File Management (MFM) Procedure Calls
056783 Tandem Computers Incorporated C–5
MFM_CANCELREQ_ This procedure allows you to cancel a nowait operation started by a previous APS
procedure. To cancel a file-system operation, call CANCELREQ instead.
error := MFM_CANCELREQ_ ( pseudofn ! I
,[ tag ] ); ! I
error returned value
INT
indicates the outcome of the call. For the possible values of error , see “Error
Codes” in Appendix B.
pseudofn input
INT:value
is the pseudofile number for which you want to cancel an operation. For APS
procedures, this is the connection endpoint identifier (CEPI).
tag input
INT(32):value
identifies the operation you wish to cancel.
Considerations
The semantics of MFM_CANCELREQ_ are similar to those of the file-system
procedure CANCELREQ.
The condition code is undefined after a call to MFM_CANCELREQ_.
A successful call to MFM_CANCELREQ_ does not guarantee that the operation
being canceled was not performed. It does, however, guarantee that the session,
presentation, or ACSE service provider will not notify you of its completion.