diff -up ElectricFence-2.2.2/efence.c\~ ElectricFence-2.2.2/efence.c

--- ElectricFence-2.2.2/efence.c~	2012-03-12 22:48:22.634989256 +0100

+++ ElectricFence-2.2.2/efence.c	2012-03-12 23:05:00.545522379 +0100

@@ -865,6 +865,41 @@ free(void * address)

 	release();

 }

+extern C_LINKAGE size_t

+malloc_usable_size(void * address)

+{

+	Slot *	slot;

+

+	lock();

+

+	if ( !noAllocationListProtection )

+		Page_AllowAccess(allocationList, allocationListSize);

+

+	slot = slotForUserAddress(address);

+

+	if ( !slot )

+		EF_Abort("free(%a): address not from malloc().", address);

+

+	if ( slot->mode != ALLOCATED ) {

+		if ( internalUse && slot->mode == INTERNAL_USE )

+			/* Do nothing. */;

+		else {

+			EF_Abort(

+			 "free(%a): malloc_usable_size on freed block."

+			,address);

+		}

+	}

+

+	size_t ret = slot->userSize;

+

+	if ( !noAllocationListProtection )

+		Page_DenyAccess(allocationList, allocationListSize);

+

+	release();

+

+	return ret;

+}

+

 extern C_LINKAGE void *

 realloc(void * oldBuffer, size_t newSize)

 {

Diff finished.  Mon Mar 12 23:06:53 2012