NtDeviceIoControlFile function

The ZwDeviceIoControlFile routine sends a control code directly to a specified device driver, causing the corresponding driver to perform the specified operation.

Syntax

__kernel_entry NTSYSCALLAPI NTSTATUS NtDeviceIoControlFile(
  HANDLE           FileHandle,
  HANDLE           Event,
  PIO_APC_ROUTINE  ApcRoutine,
  PVOID            ApcContext,
  PIO_STATUS_BLOCK IoStatusBlock,
  ULONG            IoControlCode,
  PVOID            InputBuffer,
  ULONG            InputBufferLength,
  PVOID            OutputBuffer,
  ULONG            OutputBufferLength
);

Parameters

FileHandle

Handle returned by ZwCreateFile or ZwOpenFile for the file object representing the device to which the control information should be given or from which information should be returned. The file object must have been opened for asynchronous I/O if the caller specifies an Event, ApcRoutine, and an APC context (in ApcContext), or a completion context (in ApcContext). For I/O to an underlying mass-storage device, the file object must have been opened for Direct Access to Storage Device (DASD) access.

Event

Handle for a caller-created event. If this parameter is supplied, the caller will be put into a wait state until the requested operation is completed and the given event is set to the Signaled state. This parameter is optional and can be NULL. It must be NULL if the caller will wait for the FileHandle to be set to the Signaled state.

ApcRoutine

Address of an optional, caller-supplied APC routine to be called when the requested operation completes. This parameter can be NULL. It must be NULL if there is an I/O completion object associated with the file object.

ApcContext

Pointer to a caller-determined context area. This parameter value is used as the APC context if the caller supplies an APC, or is used as the completion context if an I/O completion object has been associated with the file object. When the operation completes, either the APC context is passed to the APC, if one was specified, or the completion context is included as part of the completion message that the I/O Manager posts to the associated I/O completion object.

This parameter is optional and can be NULL. It must be NULL if ApcRoutine is NULL and there is no I/O completion object associated with the file object.

IoStatusBlock

Pointer to a variable that receives the final completion status and information about the operation. For successful calls that return data, the number of bytes written to the OutputBuffer is returned in the Information member.

IoControlCode

IOCTL_XXX code that indicates which device I/O control operation is to be carried out on, usually by the underlying device driver. The value of this parameter determines the format and required length of the InputBuffer and OutputBuffer, as well as which of the following parameter pairs are required. For detailed information about the system-defined, device-type-specific IOCTL_XXX codes, see the device technology-specific section of the Microsoft Windows Driver Kit (WDK) documentation and Device Input and Output Control Codes in the Microsoft Windows SDK documentation.

InputBuffer

Pointer to a caller-allocated input buffer that contains device-specific information to be given to the target device. If IoControlCode specifies an operation that does not require input data, this pointer can be NULL.

InputBufferLength

Size, in bytes, of the buffer at InputBuffer. If InputBuffer is NULL, set InputBufferLength to zero.

OutputBuffer

Pointer to a caller-allocated output buffer in which information is returned from the target device. If IoControlCode specifies an operation that does not produce output data, this pointer can be NULL.

OutputBufferLength

Size, in bytes, of the buffer at OutputBuffer. If OutputBuffer is NULL, set OutputBufferLength to zero.

Return Value

ZwDeviceIoControlFile returns STATUS_SUCCESS if the underlying driver(s) successfully carried out the requested operation. Otherwise, the return value can be an error status code propagated from an underlying driver. Possible error status codes include the following:

Remarks

ZwDeviceIoControlFile provides a consistent view of the input and output data to the system and to kernel-mode drivers, while providing applications and underlying drivers with a device-dependent method of specifying a communications interface.

For more information about system-defined IOCTL_XXX codes, and about defining driver-specific IOCTL_XXX or FSCTL_XXX values, see Using I/O Control Codes in the Kernel Mode Architecture Guide and Device Input and Output Control Codes in the Microsoft Windows SDK documentation.

If the caller opened the file for asynchronous I/O (with neither FILE_SYNCHRONOUS_XXX create/open option set), the specified event, if any, will be set to the signaled state when the device control operation completes. Otherwise, the file object specified by FileHandle will be set to the signaled state. If an ApcRoutine was specified, it is called with the ApcContext and IoStatusBlock pointers.

Minifilters should use FltDeviceIoControlFile instead of ZwDeviceIoControlFile.

Callers of ZwDeviceIoControlFile must be running at IRQL = PASSIVE_LEVEL and with special kernel APCs enabled.

Note If the call to the ZwDeviceIoControlFile function occurs in user mode, you should use the name "NtDeviceIoControlFile" instead of "ZwDeviceIoControlFile".
For calls from kernel-mode drivers, the NtXxx and ZwXxx versions of a Windows Native System Services routine can behave differently in the way that they handle and interpret input parameters. For more information about the relationship between the NtXxx and ZwXxx versions of a routine, see Using Nt and Zw Versions of the Native System Services Routines.

Requirements

   
Windows version Available starting with Windows 2000.
Target Platform Universal
Header ntifs.h (include Ntifs.h, Ntddk.h)
Library NtosKrnl.lib
DLL NtosKrnl.exe
IRQL PASSIVE_LEVEL (see Remarks section)
DDI compliance rules PowerIrpDDis, HwStorPortProhibitedDDIs

See Also

FltDeviceIoControlFile

IoBuildAsynchronousFsdRequest

IoBuildDeviceIoControlRequest

IoBuildSynchronousFsdRequest

IoCallDriver

Using I/O Control Codes

Using Nt and Zw Versions of the Native System Services Routines

ZwClose

ZwCreateFile

ZwOpenFile