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Inside Macintosh: Devices /

Chapter 4 - SCSI Manager 4.3 / SCSI Manager 4.3 Reference

SCSI Manager 4.3 Functions / SIM Support Functions

SCSIDeregisterBus

You can use the SCSIDeregisterBus function to deregister a bus that is no longer available.

OSErr SCSIDeregisterBus(SCSI_PB *scsiPB);

scsiPB

A pointer to a SCSI Manager parameter block.

-->	scsiPBLength	UInt16	The size of the parameter block.
<--	scsiResult	OSErr	The returned result code.
-->	scsiDevice	DeviceIdent	The device identification record. Only the bus number is required.
-->	scsiCompletion	CallbackProc	Unused. Must be set to nil.

DESCRIPTION

The SCSIDeregisterBus function attempts to remove the SIM specified by the scsiDevice.bus field of the parameter block. The XPT marks the bus number as invalid and any subsequent requests to it are rejected. This function is not normally used by the Macintosh Operating System and may not be supported in all implementations.

Because this function is always executed synchronously, the scsiCompletion field must be set to nil.

SPECIAL CONSIDERATIONS

The SCSIDeregisterBus function may move memory; you should not call it at interrupt time.

RESULT CODES

noErr	0	No error
scsiBusInvalid	-7869	The bus ID is invalid
scsiFunctionNotAvailable	-7871	The function is not supported by this SIM