RtlReAllocateHeap - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
#ifndef _NTRTL_H

NTSYSAPI
_Success_(return != 0)
_Must_inspect_result_
_Ret_maybenull_
_Post_writable_byte_size_(Size)
_When_(Size > 0, __drv_allocatesMem(Mem))
DECLSPEC_ALLOCATOR
DECLSPEC_NOALIAS
DECLSPEC_RESTRICT
PVOID
NTAPI
RtlReAllocateHeap(
    _In_ PVOID HeapHandle,
    _In_ ULONG Flags,
    _Frees_ptr_opt_ PVOID BaseAddress,
    _In_ SIZE_T Size
    );

#endif

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Kernel32.dll HeapReAlloc maps directly to RtlReAllocateHeap. All parameters are described in Ms SDK.

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