FAKE_VM - Special VM and EFN handling.

FAKE_VM intercepts memory and event flag allocation routines and
permits various debug and control options to help control or
monitor the actions of these routines.

FAKE_VM intercepts the following routines in LIBRTL:

  LIB$GET_VM		The general get VM routine.
			[FAKE_VM does *not* handle zones!]

  LIB$FREE_VM		The general free VM routine.
			[FAKE_VM does *not* handle zones!]

  LIB$SGET1_DD	The get dynamic string routine.

  LIB$SFREE1_DD	The free one dynamic string routine.

  LIB$SFREEN_DD	The free n dynamic strings routine.

  LIB$GET_EF		The general get EFN routine.

  LIB$FREE_EF		The general free EFN routine.

And, as of VMS V5.2, the following:

  LIB$VM_MALLOC	The memory allocate routine.

  LIB$VM_CALLOC	The cleared memory allocate routine.

  LIB$VM_REALLOC	The memory reallocate routine.

  LIB$VM_FREE		The memory free routine.

FAKE_VM intercepts the following routines in VAXCRTL[G]
provided that the VAXCRTL[G] shareable image was included
when the image containing FAKE_VM was linked:

  MALLOC		The memory allocate routine.

  CALLOC		The cleared memory allocate routine.

  REALLOC		The memory reallocate routine.

  FREE		The memory free routine.

  CFREE		The memory free routine.

  VAXC$MALLOC_OPT	The optimized memory allocate routine.

  VAXC$CALLOC_OPT	The optimized cleared memory allocate routine.

  VAXC$REALLOC_OPT	The optimized memory reallocate routine.

  VAXC$FREE_OPT	The optimized memory free routine.

  VAXC$CFREE_OPT	The optimized memory free routine.

FAKE_VM intercepts the following routines in DECW$XLIBSHR
provided that the DECW$XLIBSHR shareable image was included
when the image containing FAKE_VM was linked:

  XMEMORY_MALLOC	The memory allocate routine.

  XMEMORY_CALLOC	The cleared memory allocate routine.

  XMEMORY_REALLOC	The memory reallocate routine.

  XMEMORY_FREE	The memory free routine.

Submitted by Mark Barmhall, DEC.