// Scavenger.decl
// Copyright Xerox Corporation 1981, 1982
// Last modified May 2, 1982  10:52 PM by Boggs

//-----------------------------------------------------------------------------------------
structure FD:		// File Descriptor
//-----------------------------------------------------------------------------------------
[
sn @SN			// serial number
firstVDA word		// vda of first page
lastVDA word		// vda of last page
lastPN word		// page number of last page
lastNumChars bit 9	// number of bytes in last page
blank bit 3
duplicate bit		// used by scan pass
registered bit		// used by directory pass
state bit 2		// see below
]
manifest lenFD = size FD/16

manifest 
[
// FD.state values:
fdBeingChecked = 0
fdToBeChecked = 1
fdGood = 2
fdBad = 3
]