#ifndef _NTOBAPI_H
// Symbolic links
#if (PHNT_MODE != PHNT_MODE_KERNEL)

NTSYSCALLAPI
NTSTATUS
NTAPI
NtQuerySymbolicLinkObject(
    _In_ HANDLE LinkHandle,
    _Inout_ PUNICODE_STRING LinkTarget,
    _Out_opt_ PULONG ReturnedLength
    );

#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwQuerySymbolicLinkObject(
    _In_ HANDLE LinkHandle,
    _Inout_ PUNICODE_STRING LinkTarget,
    _Out_opt_ PULONG ReturnedLength
    );

#endif
View code on GitHub