=> R0 = 0 - claim
1 - force claim
2 - release
Others = Reason code specific
This SWI allows the caller to claim exclusive use of a device and may prevent data corruption problems that may arise if a program (by accident or on purpose) issues a Write/Format/ModeSelect command to a device currently mounted by SCSIFS.
It also provides for a clean change of device ownership from one user to another, as SCSIdm for example is entitled to modify your disc, (to map out defects/format/partition it etc) but must only do so once SCSIFS has closed down all open files and dismounted the disc.
Claim
=> R0 = 0
R1 = device ID
R2 = release address
R3 = workspace pointer, to be passed in R12 when release address is called
R8 = access key
Will return a reservation error if unsuccessful.
Force Claim
=> R0 = 1
R1 = device ID
R2 = release address
R3 = workspace pointer, to be passed in R12 when release address is called
R8 = access key
This call is similar to claim, however, if the device is already claimed, it will ask the current claimant to release it, by calling the release address registered for that device.
Release
=> R0 = 2
R1 = device ID
R8 = access key
Releases the lock on the given device.
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