NAME

AllocUnit: allocate a unit of the disk

SYNOPSIS

success = AllocUnit( unitNum ), DRResource
D0 D0 A6

BOOL AllocUnit(LONG);

FUNCTION

This routine allocates one of the units of the disk. It should be called before trying to use the disk (via GetUnit).

In reality, it is perfectly fine to use GetUnit/GiveUnit if AllocUnit fails. Do NOT call FreeUnit if AllocUnit did not succeed. This has been the case for all revisions of disk.resource.

INPUTS

unitNum: A legal unit number (zero through three)

RESULT

success: Nonzero if successful. zero on failure.