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Exchange/SNA Manual

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CANCELREQ Procedure
Exchange/SNA System Procedure Calls
104700 Tandem Computers Incorporated 5–7
CANCELREQ
Procedure
The CANCELREQ procedure cancels a specific I/O operation against a file opened for
nowait I/O.
CALL CANCELREQ (
filenum
[,
tag
] );
filenum
INT:value
is the file number of a previously opened subdevice supported by the
Exchange/SNA line server. The number you specify here is the number returned
by the call to OPEN that opened the subdevice.
tag
INT(32):value
is a unique, application-defined value that your program uses to identify a
particular I/O operation when performing nowait I/O. The value you specify is
the value supplied by your program when the nowait I/O operation was initiated.
This parameter is required to identify individual I/O operations when a single file
can have two or more nowait I/O operations outstanding at the same time.
If you omit
tag
, CANCELREQ works exactly like CANCEL.
Considerations See the CANCEL procedure earlier in this section for considerations.