#ifndef _NTEXAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)

/**
 * The NtSystemDebugControl routine provides system debugging and diagnostic control of the system.
 *
 * \param[in] Command The debug control command to execute (of type SYSDBG_COMMAND).
 * \param[in] InputBuffer Optional pointer to a buffer containing input data for the command.
 * \param[in] InputBufferLength Length, in bytes, of the input buffer.
 * \param[out] OutputBuffer Optional pointer to a buffer that receives output data from the command.
 * \param[in] OutputBufferLength Length, in bytes, of the output buffer.
 * \param[out] ReturnLength Optional pointer to a variable that receives the number of bytes returned in the output buffer.
 * \return NTSTATUS Successful or errant status.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtSystemDebugControl(
    _In_ SYSDBG_COMMAND Command,
    _Inout_updates_bytes_opt_(InputBufferLength) PVOID InputBuffer,
    _In_ ULONG InputBufferLength,
    _Out_writes_bytes_opt_(OutputBufferLength) PVOID OutputBuffer,
    _In_ ULONG OutputBufferLength,
    _Out_opt_ PULONG ReturnLength
    );

#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwSystemDebugControl(
    _In_ SYSDBG_COMMAND Command,
    _Inout_updates_bytes_opt_(InputBufferLength) PVOID InputBuffer,
    _In_ ULONG InputBufferLength,
    _Out_writes_bytes_opt_(OutputBufferLength) PVOID OutputBuffer,
    _In_ ULONG OutputBufferLength,
    _Out_opt_ PULONG ReturnLength
    );

#endif
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