RtlGetFunctionTableListHead - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTRTL_H
#ifdef _WIN64

// rev
NTSYSAPI
PLIST_ENTRY
NTAPI
RtlGetFunctionTableListHead(
    VOID
    );

#endif
#endif

View code on GitHub

This function is documented in Windows SDK.