#ifndef _NTMMAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)

//
// Misc.
//

/**
 * Retrieves the addresses of the pages that are written to in a region of virtual memory.
 *
 * \param ProcessHandle A handle to the process whose watch information is to be queried.
 * \param Flags Additional flags for the operation. To reset the write-tracking state, set this parameter to WRITE_WATCH_FLAG_RESET. Otherwise, set this parameter to zero.
 * \param BaseAddress The base address of the memory region for which to retrieve write-tracking information. This address must a region that is allocated using MEM_WRITE_WATCH.
 * \param RegionSize The size of the memory region for which to retrieve write-tracking information, in bytes.
 * \param UserAddressArray A pointer to a buffer that receives an array of page addresses that have been written to since the region has been allocated or the write-tracking state has been reset.
 * \param EntriesInUserAddressArray On input, this variable indicates the size of the UserAddressArray array. On output, the variable receives the number of page addresses that are returned in the array.
 * \param Granularity A pointer to a variable that receives the page size, in bytes.
 * \return NTSTATUS Successful or errant status.
 * \see https://learn.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-getwritewatch
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtGetWriteWatch(
    _In_ HANDLE ProcessHandle,
    _In_ ULONG Flags,
    _In_ PVOID BaseAddress,
    _In_ SIZE_T RegionSize,
    _Out_writes_(*EntriesInUserAddressArray) PVOID *UserAddressArray,
    _Inout_ PULONG_PTR EntriesInUserAddressArray,
    _Out_ PULONG Granularity
    );

#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwGetWriteWatch(
    _In_ HANDLE ProcessHandle,
    _In_ ULONG Flags,
    _In_ PVOID BaseAddress,
    _In_ SIZE_T RegionSize,
    _Out_writes_(*EntriesInUserAddressArray) PVOID *UserAddressArray,
    _Inout_ PULONG_PTR EntriesInUserAddressArray,
    _Out_ PULONG Granularity
    );

#endif
View code on GitHub