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Inside Macintosh: Networking /

Chapter 8 - AppleTalk Session Protocol (ASP) / ASP Reference

Routines / Canceling an ASP Request to Open a Session

ASPAbortOS

The ASPAbortOS function cancels a specific pending request to open an ASP session function.

FUNCTION ASPAbortOS (thePBptr: XPPParmBlkPtr;
                     async: Boolean): OSErr;

thePBptr

A pointer to an XPP parameter block.

async

A Boolean that specifies whether the function should be executed asynchronously or synchronously. Specify TRUE for asynchronous execution.

-->	ioCompletion	ProcPtr	A pointer to a completion routine.
<--	ioResult	OSErr	The function result.
-->	ioRefNum	Integer	The .XPP driver reference number.
-->	csCode	Integer	Always abortOS for this function.
-->	abortSCBPointer	Ptr	A pointer to the session control block.

Field Description

abortSCBPointer

A pointer to the session control block (SCB) that you passed to the ASPOpenSession function that you want to cancel.

DESCRIPTION

The ASPAbortOS function cancels a single call to the ASPOpenSession function if that function has not yet completed execution. You identify the request to be canceled by passing the ASPAbortOS function the pointer to the original session control block that you specified to open the session.

SPECIAL CONSIDERATIONS

Note that you must provide the .XPP driver reference number as an input parameter to this function. You can obtain the driver reference number by calling the Device Manager's OpenDriver function.

ASSEMBLY-LANGUAGE INFORMATION

To execute the ASPAbortOS function from assembly language, call the _Control trap macro with a value of abortOS in the csCode field of the parameter block. You must also specify the .XPP driver reference number. To execute the _Control trap asynchro-
nously, include the value ,ASYNC in the operand field.

RESULT CODES

cbNotFound

-1102

Specified SCB was not found (there is no outstanding open session function call with this SCB)

SEE ALSO

For information on the session control block, see the description of the ASPOpenSession function on page 8-9.