Undocumented functions of NTDLL

2OOO, 14 December

NTSYSAPI 
PVOID
NTAPI
RtlCreateHeap(

  IN ULONG                Flags,
  IN PVOID                Base OPTIONAL,
  IN ULONG                Reserve OPTIONAL,
  IN ULONG                Commit,
  IN BOOLEAN              Lock OPTIONAL,
  IN PRTL_HEAP_DEFINITION RtlHeapParams OPTIONAL );

Flags
Flags are defined in <WinNT.h>. Can be one of following:
	HEAP_NO_SERIALIZE
	HEAP_GROWABLE
	HEAP_GENERATE_EXCEPTIONS
	HEAP_ZERO_MEMORY
	HEAP_REALLOC_IN_PLACE_ONLY
	HEAP_TAIL_CHECKING_ENABLED
	HEAP_FREE_CHECKING_ENABLED
	HEAP_DISABLE_COALESCE_ON_FREE
	HEAP_CREATE_ALIGN_16
	HEAP_CREATE_ENABLE_TRACING

Base
Base address, where heap should be created. If memory was previously allocated at this address, heap is created at the nearest possibble virtual address.

Reserve
How much bytes should be reserved. See NtAllocateVirtualMemory.

Commit
How meny bytes should be commited. If Reserve is greater than zero, Commit must be less or equal to Reserve.

Lock
If set, heap will be locked. See RtlLockHeap / RtlUnlockHeap.

RtlHeapParams
Pointer to RTL_HEAP_DEFINITION structure. On NT 4.0 all bytes of this (except length field) are set to zero.