RtlCreateAcl - NtDoc

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

// ACLs

NTSYSAPI
NTSTATUS
NTAPI
RtlCreateAcl(
    _Out_writes_bytes_(AclLength) PACL Acl,
    _In_ ULONG AclLength,
    _In_ ULONG AclRevision
    );

#endif

View code on GitHub

This function is documented in Windows Driver Kit.