CurrentDir

Make a directory Lock the current directory

CurrentDir() causes a directory associated with a Lock to be made the current directory. The old current directory Lock is returned.

A value of zero is a valid result here as this 0 Lock represents the root of the file system that you booted from.

Any call that has to Open() or Lock() files, etc. requires that the current directory be a valid Lock or 0.

lock

BCPL pointer to a Lock

oldLock

BCPL pointer to a Lock

Lock(), UnLock(), Open(), DupLock()