info.c File Reference

#include "serial.h"
#include <debug.h>

Include dependency graph for info.c:

Go to the source code of this file.

Functions
NTSTATUS NTAPI	SerialQueryInformation (IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp)

Function Documentation

SerialQueryInformation()

NTSTATUS NTAPI SerialQueryInformation	(	IN PDEVICE_OBJECT	DeviceObject,
		IN PIRP	Irp
	)

Definition at line 15 of file info.c.

{
    PIO_STACK_LOCATION Stack;
    PVOID SystemBuffer;
    ULONG BufferLength;
    ULONG_PTR Information = 0;
    NTSTATUS Status;

    Stack = IoGetCurrentIrpStackLocation(Irp);
    SystemBuffer = Irp->AssociatedIrp.SystemBuffer;
    BufferLength = Stack->Parameters.QueryFile.Length;

    switch (Stack->Parameters.QueryFile.FileInformationClass)
    {
        case FileStandardInformation:
        {
            PFILE_STANDARD_INFORMATION StandardInfo = (PFILE_STANDARD_INFORMATION)SystemBuffer;

            TRACE_(SERIAL, "IRP_MJ_QUERY_INFORMATION / FileStandardInformation\n");
            if (BufferLength < sizeof(FILE_STANDARD_INFORMATION))
                Status = STATUS_BUFFER_OVERFLOW;
            else if (!StandardInfo)
                Status = STATUS_INVALID_PARAMETER;
            else
            {
                StandardInfo->AllocationSize.QuadPart = 0;
                StandardInfo->EndOfFile.QuadPart = 0;
                StandardInfo->Directory = FALSE;
                StandardInfo->NumberOfLinks = 0;
                StandardInfo->DeletePending = FALSE; /* FIXME: should be TRUE sometimes */
                Information = sizeof(FILE_STANDARD_INFORMATION);
                Status = STATUS_SUCCESS;
            }
            break;
        }
        case FilePositionInformation:
        {
            PFILE_POSITION_INFORMATION PositionInfo = (PFILE_POSITION_INFORMATION)SystemBuffer;

            ASSERT(PositionInfo);

            TRACE_(SERIAL, "IRP_MJ_QUERY_INFORMATION / FilePositionInformation\n");
            if (BufferLength < sizeof(FILE_POSITION_INFORMATION))
                Status = STATUS_BUFFER_OVERFLOW;
            else if (!PositionInfo)
                Status = STATUS_INVALID_PARAMETER;
            else
            {
                PositionInfo->CurrentByteOffset.QuadPart = 0;
                Information = sizeof(FILE_POSITION_INFORMATION);
                Status = STATUS_SUCCESS;
            }
            break;
        }
        default:
        {
            TRACE_(SERIAL, "IRP_MJ_QUERY_INFORMATION: Unexpected file information class 0x%02x\n", Stack->Parameters.QueryFile.FileInformationClass);
            return ForwardIrpAndForget(DeviceObject, Irp);
        }
    }

    Irp->IoStatus.Information = Information;
    Irp->IoStatus.Status = Status;
    IoCompleteRequest(Irp, IO_NO_INCREMENT);
    return Status;
}