/****************************************************************************
*
* drvproc.c
*
* Copyright (c) 1991-1992 Microsoft Corporation. All Rights Reserved.
*
***************************************************************************/
#include <windows.h>
#include <mmsystem.h>
#include "adlib.h"
WORD wWriteDelay;
/***************************************************************************
* @doc INTERNAL
*
* @func void | DrvLoadInitialize | Initializes the write delay time. LibEntry
* has already initialized the global wWriteDelay according to the type of
* CPU present.
*
* @rdesc Nothing.
***************************************************************************/
static void PASCAL NEAR DrvLoadInitialize(void)
{
WORD wDefDelay;
wDefDelay = wWriteDelay;
wWriteDelay = GetPrivateProfileInt(aszDriverName, aszAdlibDelay,
wDefDelay, aszSystemIni);
if (!wWriteDelay)
wWriteDelay = wDefDelay;
}
/***************************************************************************
* @doc INTERNAL
*
* @api LONG | DriverProc | The entry point for an installable driver.
*
* @parm DWORD | dwDriverId | For most messages, <p dwDriverId> is the DWORD
* value that the driver returns in response to a <m DRV_OPEN> message.
* Each time that the driver is opened, through the <f DrvOpen> API,
* the driver receives a <m DRV_OPEN> message and can return an
* arbitrary, non-zero value. The installable driver interface
* saves this value and returns a unique driver handle to the
* application. Whenever the application sends a message to the
* driver using the driver handle, the interface routes the message
* to this entry point and passes the corresponding <p dwDriverId>.
* This mechanism allows the driver to use the same or different
* identifiers for multiple opens but ensures that driver handles
* are unique at the application interface layer.
*
* The following messages are not related to a particular open
* instance of the driver. For these messages, the dwDriverId
* will always be zero.
*
* DRV_LOAD, DRV_FREE, DRV_ENABLE, DRV_DISABLE, DRV_OPEN
*
* @parm HANDLE | hDriver | This is the handle returned to the
* application by the driver interface.
*
* @parm WORD | wMessage | The requested action to be performed. Message
* values below <m DRV_RESERVED> are used for globally defined messages.
* Message values from <m DRV_RESERVED> to <m DRV_USER> are used for
* defined driver protocols. Messages above <m DRV_USER> are used
* for driver specific messages.
*
* @parm LONG | lParam1 | Data for this message. Defined separately for
* each message
*
* @parm LONG | lParam2 | Data for this message. Defined separately for
* each message
*
* @rdesc Defined separately for each message.
***************************************************************************/
LONG FAR PASCAL _loadds DriverProc(DWORD dwDriverID, HANDLE hDriver, WORD wMessage, LONG lParam1, LONG lParam2)
{
switch (wMessage) {
case DRV_LOAD:
D1("DRV_LOAD");
/*
Sent to the driver when it is loaded. Always the first
message received by a driver.
dwDriverID is 0L.
lParam1 is 0L.
lParam2 is 0L.
Return 0L to fail the load.
DefDriverProc will return NON-ZERO so we don't have to
handle DRV_LOAD
*/
DrvLoadInitialize();
return 1L;
case DRV_FREE:
D1("DRV_FREE");
/*
Sent to the driver when it is about to be discarded. This
will always be the last message received by a driver before
it is freed.
dwDriverID is 0L.
lParam1 is 0L.
lParam2 is 0L.
Return value is ignored.
*/
return 1L;
case DRV_OPEN:
D1("DRV_OPEN");
/*
Sent to the driver when it is opened.
dwDriverID is 0L.
lParam1 is a far pointer to a zero-terminated string
containing the name used to open the driver.
lParam2 is passed through from the drvOpen call.
Return 0L to fail the open.
DefDriverProc will return ZERO so we do have to
handle the DRV_OPEN message.
*/
return 1L;
case DRV_CLOSE:
D1("DRV_CLOSE");
/*
Sent to the driver when it is closed. Drivers are unloaded
when the close count reaches zero.
dwDriverID is the driver identifier returned from the
corresponding DRV_OPEN.
lParam1 is passed through from the drvClose call.
lParam2 is passed through from the drvClose call.
Return 0L to fail the close.
DefDriverProc will return ZERO so we do have to
handle the DRV_CLOSE message.
*/
return 1L;
case DRV_ENABLE:
D1("DRV_ENABLE");
/*
Sent to the driver when the driver is loaded or reloaded
and whenever Windows is enabled. Drivers should only
hook interrupts or expect ANY part of the driver to be in
memory between enable and disable messages
dwDriverID is 0L.
lParam1 is 0L.
lParam2 is 0L.
Return value is ignored.
*/
return Enable() ? 1L : 0L;
case DRV_DISABLE:
D1("DRV_DISABLE");
/*
Sent to the driver before the driver is freed.
and whenever Windows is disabled
dwDriverID is 0L.
lParam1 is 0L.
lParam2 is 0L.
Return value is ignored.
*/
Disable();
return 1L;
case DRV_QUERYCONFIGURE:
D1("DRV_QUERYCONFIGURE");
/*
Sent to the driver so that applications can
determine whether the driver supports custom
configuration. The driver should return a
non-zero value to indicate that configuration
is supported.
dwDriverID is the value returned from the DRV_OPEN
call that must have succeeded before this message
was sent.
lParam1 is passed from the app and is undefined.
lParam2 is passed from the app and is undefined.
Return 0L to indicate configuration NOT supported.
*/
return 0L; /* we don't do configuration */
case DRV_CONFIGURE:
D1("DRV_CONFIGURE");
/*
Sent to the driver so that it can display a custom
configuration dialog box.
lParam1 is passed from the app. and should contain
the parent window handle in the loword.
lParam2 is passed from the app and is undefined.
Return value is undefined.
Drivers should create their own section in system.ini.
The section name should be the driver name.
*/
return DRVCNF_CANCEL;
case DRV_INSTALL:
D1("DRV_INSTALL");
return DRVCNF_RESTART;
default:
return DefDriverProc(dwDriverID, hDriver, wMessage, lParam1, lParam2);
}
}
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