#ifndef _NTRTL_H
NTSYSAPI
NTSTATUS
NTAPI
RtlSetDaclSecurityDescriptor(
    _Inout_ PSECURITY_DESCRIPTOR SecurityDescriptor,
    _In_ BOOLEAN DaclPresent,
    _In_opt_ PACL Dacl,
    _In_ BOOLEAN DaclDefaulted
    );
View code on GitHubThis function is documented in Windows Driver Kit.