RtlExitUserProcess - NtDoc

#ifndef _NTRTL_H
#if (PHNT_VERSION >= PHNT_VISTA)

DECLSPEC_NORETURN
NTSYSAPI
VOID
NTAPI
RtlExitUserProcess(
    _In_ NTSTATUS ExitStatus
    );

#endif
#endif
View code on GitHub

#ifndef _NTRTL_H
#if (PHNT_VERSION >= PHNT_VISTA)
// ...
#else

#define RtlExitUserProcess RtlExitUserProcess_R

#endif
#endif
View code on GitHub