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179 lines
3.7 KiB
179 lines
3.7 KiB
/*++
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Copyright (c) 1995 Microsoft Corporation
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Module Name:
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qsfile.c
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Abstract:
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This module contains the code that is very specific to query/set file
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operations in the modem driver.
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Author:
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Anthony V. Ercolano 24-Aug-1995
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Environment:
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Kernel mode
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Revision History :
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--*/
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#include "precomp.h"
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NTSTATUS
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UniQueryInformationFile(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This routine is used to query the end of file information on
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the opened modem port. Any other file information request
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is retured with an invalid parameter.
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This routine always returns an end of file of 0. There is no
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reason to even send this down to the lower level serial driver
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since this is all that lower level driver would do. Might
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as well take care of it here.
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Also, as this has no effect on the reading or writing of
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data, there is no reason to check if we are in a passthrough
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state.
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Arguments:
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DeviceObject - Pointer to the device object for this device
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Irp - Pointer to the IRP for the current request
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Return Value:
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The function value is the final status of the call
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--*/
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{
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//
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// The status that gets returned to the caller and
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// set in the Irp.
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//
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NTSTATUS Status;
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//
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// The current stack location. This contains all of the
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// information we need to process this particular request.
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//
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PIO_STACK_LOCATION IrpSp;
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UNREFERENCED_PARAMETER(DeviceObject);
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IrpSp = IoGetCurrentIrpStackLocation(Irp);
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Irp->IoStatus.Information = 0L;
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Status = STATUS_SUCCESS;
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if (IrpSp->Parameters.QueryFile.FileInformationClass ==
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FileStandardInformation) {
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PFILE_STANDARD_INFORMATION Buf = Irp->AssociatedIrp.SystemBuffer;
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Buf->AllocationSize.QuadPart = 0;
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Buf->EndOfFile = Buf->AllocationSize;
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Buf->NumberOfLinks = 0;
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Buf->DeletePending = FALSE;
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Buf->Directory = FALSE;
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Irp->IoStatus.Information = sizeof(FILE_STANDARD_INFORMATION);
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} else if (IrpSp->Parameters.QueryFile.FileInformationClass ==
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FilePositionInformation) {
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((PFILE_POSITION_INFORMATION)Irp->AssociatedIrp.SystemBuffer)->
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CurrentByteOffset.QuadPart = 0;
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Irp->IoStatus.Information = sizeof(FILE_POSITION_INFORMATION);
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} else {
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Status = STATUS_INVALID_PARAMETER;
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}
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IoCompleteRequest(
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Irp,
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0
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);
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return Status;
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}
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NTSTATUS
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UniSetInformationFile(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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This routine is used to set the end of file information on
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the opened parallel port. Any other file information request
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is retured with an invalid parameter.
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This routine always ignores the actual end of file since
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the query information code always returns an end of file of 0.
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Arguments:
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DeviceObject - Pointer to the device object for this device
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Irp - Pointer to the IRP for the current request
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Return Value:
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The function value is the final status of the call
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--*/
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{
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//
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// The status that gets returned to the caller and
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// set in the Irp.
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//
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NTSTATUS Status;
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UNREFERENCED_PARAMETER(DeviceObject);
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Irp->IoStatus.Information = 0L;
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if ((IoGetCurrentIrpStackLocation(Irp)->
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Parameters.SetFile.FileInformationClass ==
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FileEndOfFileInformation) ||
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(IoGetCurrentIrpStackLocation(Irp)->
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Parameters.SetFile.FileInformationClass ==
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FileAllocationInformation)) {
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Status = STATUS_SUCCESS;
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} else {
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Status = STATUS_INVALID_PARAMETER;
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}
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Irp->IoStatus.Status = Status;
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IoCompleteRequest(
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Irp,
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0
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);
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return Status;
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}
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