mirror of
https://github.com/reactos/reactos.git
synced 2024-12-28 10:04:49 +00:00
Fixed bugs in null device drivers, added zero stream device
svn path=/trunk/; revision=2897
This commit is contained in:
KJK::Hyperion
parent
bceb83614d
commit
488ec274f1
3 changed files with 159 additions and 79 deletions
|
|
@ -1,4 +1,4 @@
|
|||
# $Id: makefile,v 1.14 2001/08/21 20:13:11 chorns Exp $
|
||||
# $Id: makefile,v 1.15 2002/04/29 23:06:42 hyperion Exp $
|
||||
|
||||
PATH_TO_TOP = ../../..
|
||||
|
||||
|
|
@ -8,6 +8,8 @@ TARGET_NAME = null
|
|||
|
||||
TARGET_OBJECTS = null.o
|
||||
|
||||
TARGET_LFLAGS = -Wl,--file-alignment,0x20 -Wl,--section-alignment,0x20
|
||||
|
||||
include $(PATH_TO_TOP)/rules.mak
|
||||
|
||||
include $(TOOLS_PATH)/helper.mk
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
/* $Id: null.c,v 1.6 2002/02/08 02:57:08 chorns Exp $
|
||||
/* $Id: null.c,v 1.7 2002/04/29 23:06:42 hyperion Exp $
|
||||
*
|
||||
* COPYRIGHT: See COPYING in the top level directory
|
||||
* PROJECT: ReactOS kernel
|
||||
|
|
@ -6,100 +6,159 @@
|
|||
* PURPOSE: NULL device driver
|
||||
* PROGRAMMER: David Welch (welch@mcmail.com)
|
||||
* UPDATE HISTORY:
|
||||
* 13/08/98: Created
|
||||
* 13/08/1998: Created
|
||||
* 29/04/2002: Fixed bugs, added zero-stream device
|
||||
*/
|
||||
|
||||
/* INCLUDES ****************************************************************/
|
||||
|
||||
/* INCLUDES */
|
||||
#include <ddk/ntddk.h>
|
||||
#include "null.h"
|
||||
|
||||
/* FUNCTIONS **************************************************************/
|
||||
|
||||
NTSTATUS NullWrite(PIRP Irp, PIO_STACK_LOCATION stk)
|
||||
{
|
||||
Irp->IoStatus.Information = stk->Parameters.Write.Length;
|
||||
return(STATUS_SUCCESS);
|
||||
}
|
||||
|
||||
NTSTATUS NullRead(PIRP Irp, PIO_STACK_LOCATION stk)
|
||||
{
|
||||
Irp->IoStatus.Information = 0;
|
||||
return(STATUS_END_OF_FILE);
|
||||
}
|
||||
/* OBJECTS */
|
||||
static const NULL_EXTENSION nxNull = NullBitBucket;
|
||||
static const NULL_EXTENSION nxZero = NullZeroStream;
|
||||
|
||||
/* FUNCTIONS */
|
||||
NTSTATUS STDCALL
|
||||
NullDispatch(PDEVICE_OBJECT DeviceObject, PIRP Irp)
|
||||
/*
|
||||
* FUNCTION: Handles user mode requests
|
||||
* ARGUMENTS:
|
||||
* DeviceObject = Device for request
|
||||
* Irp = I/O request packet describing request
|
||||
* RETURNS: Success or failure
|
||||
*/
|
||||
{
|
||||
PIO_STACK_LOCATION Stack = IoGetCurrentIrpStackLocation(Irp);
|
||||
NTSTATUS status;
|
||||
|
||||
switch (Stack->MajorFunction)
|
||||
{
|
||||
case IRP_MJ_CREATE:
|
||||
case IRP_MJ_CLOSE:
|
||||
status = STATUS_SUCCESS;
|
||||
break;
|
||||
|
||||
case IRP_MJ_WRITE:
|
||||
status = NullWrite(Irp,Stack);
|
||||
break;
|
||||
|
||||
case IRP_MJ_READ:
|
||||
status = NullRead(Irp,Stack);
|
||||
break;
|
||||
|
||||
default:
|
||||
status = STATUS_NOT_IMPLEMENTED;
|
||||
}
|
||||
PIO_STACK_LOCATION piosStack = IoGetCurrentIrpStackLocation(Irp);
|
||||
NTSTATUS nErrCode;
|
||||
|
||||
nErrCode = STATUS_SUCCESS;
|
||||
|
||||
Irp->IoStatus.Status = status;
|
||||
IoCompleteRequest(Irp,IO_NO_INCREMENT);
|
||||
return(status);
|
||||
switch(piosStack->MajorFunction)
|
||||
{
|
||||
/* opening and closing handles to the device */
|
||||
case IRP_MJ_CREATE:
|
||||
case IRP_MJ_CLOSE:
|
||||
{
|
||||
break;
|
||||
}
|
||||
|
||||
/* write data */
|
||||
case IRP_MJ_WRITE:
|
||||
{
|
||||
switch(NULL_DEVICE_TYPE(DeviceObject))
|
||||
{
|
||||
case NullBitBucket:
|
||||
Irp->IoStatus.Information = piosStack->Parameters.Write.Length;
|
||||
break;
|
||||
|
||||
case NullZeroStream:
|
||||
default:
|
||||
Irp->IoStatus.Information = 0;
|
||||
nErrCode = STATUS_NOT_IMPLEMENTED;
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
/* read data */
|
||||
case IRP_MJ_READ:
|
||||
{
|
||||
switch(NULL_DEVICE_TYPE(DeviceObject))
|
||||
{
|
||||
case NullBitBucket:
|
||||
Irp->IoStatus.Information = 0;
|
||||
nErrCode = STATUS_END_OF_FILE;
|
||||
break;
|
||||
|
||||
case NullZeroStream:
|
||||
RtlZeroMemory(Irp->AssociatedIrp.SystemBuffer, piosStack->Parameters.Read.Length);
|
||||
Irp->IoStatus.Information = piosStack->Parameters.Read.Length;
|
||||
break;
|
||||
|
||||
default:
|
||||
Irp->IoStatus.Information = 0;
|
||||
nErrCode = STATUS_NOT_IMPLEMENTED;
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
/* unsupported operations */
|
||||
default:
|
||||
{
|
||||
nErrCode = STATUS_NOT_IMPLEMENTED;
|
||||
}
|
||||
}
|
||||
|
||||
Irp->IoStatus.Status = nErrCode;
|
||||
IoCompleteRequest(Irp, IO_NO_INCREMENT);
|
||||
|
||||
return (nErrCode);
|
||||
}
|
||||
|
||||
NTSTATUS STDCALL
|
||||
NullUnload(PDRIVER_OBJECT DriverObject)
|
||||
{
|
||||
return(STATUS_SUCCESS);
|
||||
return(STATUS_SUCCESS);
|
||||
}
|
||||
|
||||
NTSTATUS STDCALL
|
||||
NTSTATUS STDCALL
|
||||
DriverEntry(PDRIVER_OBJECT DriverObject, PUNICODE_STRING RegistryPath)
|
||||
/*
|
||||
* FUNCTION: Called by the system to initalize the driver
|
||||
* ARGUMENTS:
|
||||
* DriverObject = object describing this driver
|
||||
* RegistryPath = path to our configuration entries
|
||||
* RETURNS: Success or failure
|
||||
*/
|
||||
{
|
||||
PDEVICE_OBJECT DeviceObject;
|
||||
UNICODE_STRING DeviceName;
|
||||
NTSTATUS Status;
|
||||
|
||||
DeviceObject->Flags=0;
|
||||
DriverObject->MajorFunction[IRP_MJ_CLOSE] = NullDispatch;
|
||||
DriverObject->MajorFunction[IRP_MJ_CREATE] = NullDispatch;
|
||||
DriverObject->MajorFunction[IRP_MJ_WRITE] = NullDispatch;
|
||||
DriverObject->MajorFunction[IRP_MJ_READ] = NullDispatch;
|
||||
DriverObject->DriverUnload = NullUnload;
|
||||
|
||||
RtlInitUnicodeString(&DeviceName,
|
||||
L"\\Device\\Null");
|
||||
Status = IoCreateDevice(DriverObject,
|
||||
0,
|
||||
&DeviceName,
|
||||
FILE_DEVICE_NULL,
|
||||
0,
|
||||
FALSE,
|
||||
&DeviceObject);
|
||||
return (Status);
|
||||
PDEVICE_OBJECT pdoNullDevice;
|
||||
PDEVICE_OBJECT pdoZeroDevice;
|
||||
UNICODE_STRING wstrDeviceName;
|
||||
NTSTATUS nErrCode;
|
||||
|
||||
/* register driver routines */
|
||||
DriverObject->MajorFunction[IRP_MJ_CLOSE] = NullDispatch;
|
||||
DriverObject->MajorFunction[IRP_MJ_CREATE] = NullDispatch;
|
||||
DriverObject->MajorFunction[IRP_MJ_WRITE] = NullDispatch;
|
||||
DriverObject->MajorFunction[IRP_MJ_READ] = NullDispatch;
|
||||
/* DriverObject->MajorFunction[IRP_MJ_QUERY_INFORMATION] = NullDispatch; */
|
||||
DriverObject->DriverUnload = NullUnload;
|
||||
|
||||
/* create null device */
|
||||
RtlInitUnicodeString(&wstrDeviceName, L"\\Device\\Null");
|
||||
|
||||
nErrCode = IoCreateDevice
|
||||
(
|
||||
DriverObject,
|
||||
sizeof(NULL_EXTENSION),
|
||||
&wstrDeviceName,
|
||||
FILE_DEVICE_NULL,
|
||||
0,
|
||||
FALSE,
|
||||
&pdoNullDevice
|
||||
);
|
||||
|
||||
/* failure */
|
||||
if(!NT_SUCCESS(nErrCode))
|
||||
{
|
||||
return (nErrCode);
|
||||
}
|
||||
|
||||
pdoNullDevice->DeviceExtension = (PVOID)&nxNull;
|
||||
|
||||
/* create zero device */
|
||||
RtlInitUnicodeString(&wstrDeviceName, L"\\Device\\Zero");
|
||||
|
||||
nErrCode = IoCreateDevice
|
||||
(
|
||||
DriverObject,
|
||||
sizeof(NULL_EXTENSION),
|
||||
&wstrDeviceName,
|
||||
FILE_DEVICE_NULL,
|
||||
FILE_READ_ONLY_DEVICE, /* zero device is read-only */
|
||||
FALSE,
|
||||
&pdoZeroDevice
|
||||
);
|
||||
|
||||
/* failure */
|
||||
if(!NT_SUCCESS(nErrCode))
|
||||
{
|
||||
IoDeleteDevice(pdoNullDevice);
|
||||
return (nErrCode);
|
||||
}
|
||||
|
||||
pdoZeroDevice->DeviceExtension = (PVOID)&nxZero;
|
||||
pdoZeroDevice->Flags |= DO_BUFFERED_IO;
|
||||
|
||||
return (nErrCode);
|
||||
}
|
||||
|
||||
/* EOF */
|
||||
|
|
|
|||
19
reactos/drivers/dd/null/null.h
Normal file
19
reactos/drivers/dd/null/null.h
Normal file
|
|
@ -0,0 +1,19 @@
|
|||
/* $Id: null.h,v 1.1 2002/04/29 23:06:42 hyperion Exp $
|
||||
*
|
||||
* COPYRIGHT: See COPYING in the top level directory
|
||||
* PROJECT: ReactOS kernel
|
||||
* FILE: services/dd/null/null.h
|
||||
* PURPOSE: NULL device driver internal definitions
|
||||
* PROGRAMMER: KJK::Hyperion <noog@libero.it>
|
||||
* UPDATE HISTORY:
|
||||
* 29/04/2002: Created
|
||||
*/
|
||||
|
||||
typedef enum __tagNULL_EXTENSION{
|
||||
NullBitBucket,
|
||||
NullZeroStream,
|
||||
} NULL_EXTENSION, *PNULL_EXTENSION;
|
||||
|
||||
#define NULL_DEVICE_TYPE(__DEVICE__) (*((PNULL_EXTENSION)((__DEVICE__)->DeviceExtension)))
|
||||
|
||||
/* EOF */
|
||||
Loading…
Reference in a new issue