71 lines
2.5 KiB
C
71 lines
2.5 KiB
C
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#include "pch.h"
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NTSTATUS
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PptPdoCreateOpen(
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IN PDEVICE_OBJECT Pdo,
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IN PIRP Irp
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)
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{
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NTSTATUS status;
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PPDO_EXTENSION pdx = Pdo->DeviceExtension;
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// bail out if a delete is pending for this device object
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if(pdx->DeviceStateFlags & PPT_DEVICE_DELETE_PENDING) {
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return P4CompleteRequest( Irp, STATUS_DELETE_PENDING, 0 );
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}
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// bail out if device has been removed
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if(pdx->DeviceStateFlags & (PPT_DEVICE_REMOVED|PPT_DEVICE_SURPRISE_REMOVED) ) {
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return P4CompleteRequest( Irp, STATUS_DEVICE_REMOVED, 0 );
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}
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// bail out if caller is confused and thinks that we are a directory
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if( IoGetCurrentIrpStackLocation(Irp)->Parameters.Create.Options & FILE_DIRECTORY_FILE ) {
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return P4CompleteRequest( Irp, STATUS_NOT_A_DIRECTORY, 0 );
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}
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// this is an exclusive access device - fail IRP if we are already open
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ExAcquireFastMutex(&pdx->OpenCloseMutex);
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if( InterlockedIncrement( &pdx->OpenCloseRefCount ) != 1 ) {
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InterlockedDecrement( &pdx->OpenCloseRefCount );
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ExReleaseFastMutex( &pdx->OpenCloseMutex );
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return P4CompleteRequest( Irp, STATUS_ACCESS_DENIED, 0 );
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}
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ExReleaseFastMutex(&pdx->OpenCloseMutex);
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PptPdoGetPortInfoFromFdo( Pdo );
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//
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// Set the default ieee1284 modes
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//
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ParInitializeExtension1284Info( pdx );
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// used to pause worker thread when we enter a "Hold Requests" state due to PnP requests
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KeInitializeEvent( &pdx->PauseEvent, NotificationEvent, TRUE );
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// set to TRUE to tell worker thread to kill itself
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pdx->TimeToTerminateThread = FALSE;
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// we are an exclusive access device - we should not already have a worker thread
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PptAssert( !pdx->ThreadObjectPointer );
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// dispatch routines signal worker thread on this semaphore when there is work for worker thread to do
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KeInitializeSemaphore(&pdx->RequestSemaphore, 0, MAXLONG);
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// create worker thread to handle serialized requests at Passive Level IRQL
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status = ParCreateSystemThread( pdx );
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if( status != STATUS_SUCCESS ) {
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DD((PCE)pdx,DDW,"PptPdoCreateOpen - FAIL worker thread creation\n");
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ExAcquireFastMutex( &pdx->OpenCloseMutex );
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InterlockedDecrement( &pdx->OpenCloseRefCount );
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if( pdx->OpenCloseRefCount < 0 ) {
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pdx->OpenCloseRefCount = 0;
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}
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ExReleaseFastMutex( &pdx->OpenCloseMutex );
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} else {
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DD((PCE)pdx,DDT,"PptPdoCreateOpen - SUCCESS\n");
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}
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return P4CompleteRequest( Irp, status, 0 );
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}
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