214 lines
6.4 KiB
C
214 lines
6.4 KiB
C
/******************************************************************************
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Copyright (C) Microsoft Corporation 1985-1990. All rights reserved.
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Title: drvr.c - Installable driver code. Common code
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Version: 1.00
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Date: 10-Jun-1990
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Author: DAVIDDS ROBWI
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------------------------------------------------------------------------------
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Change log:
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DATE REV DESCRIPTION
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----------- ----- -----------------------------------------------------------
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10-JUN-1990 ROBWI From windows 3.1 installable driver code by davidds
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*****************************************************************************/
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#include <windows.h>
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#include "mmsystem.h"
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#include "drvr.h"
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int cInstalledDrivers = 0; // Count of installed drivers
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HANDLE hInstalledDriverList = 0; // List of installed drivers
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typedef LONG (FAR PASCAL *SENDDRIVERMESSAGE31)(HANDLE, WORD, LONG, LONG);
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typedef LONG (FAR PASCAL *DEFDRIVERPROC31)(DWORD, HANDLE, WORD, LONG, LONG);
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extern SENDDRIVERMESSAGE31 lpSendDriverMessage;
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extern DEFDRIVERPROC31 lpDefDriverProc;
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extern BOOL fUseWinAPI;
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/***************************************************************************
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*
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* @doc INTERNAL
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*
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* @api LONG | InternalBroadcastDriverMessage | Send a message to a
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* range of drivers.
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*
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* @parm WORD | hDriverStart | index of first driver to send message to
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*
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* @parm WORD | message | Message to broadcast.
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*
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* @parm LONG | lParam1 | First message parameter.
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*
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* @parm LONG | lParam2 | Second message parameter.
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*
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* @parm WORD | flags | defines range of drivers as follows:
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*
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* @flag IBDM_SENDMESSAGE | Only send message to hDriverStart.
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*
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* @flag IBDM_ONEINSTANCEONLY | This flag is ignored if IBDM_SENDMESSAGE is
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* set. Only send message to single instance of each driver.
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*
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* @flag IBDM_REVERSE | This flag is ignored if IBDM_SENDMESSAGE is set.
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* Send message to drivers with indices between
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* hDriverStart and 1 instead of hDriverStart and cInstalledDrivers.
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* If IBDM_REVERSE is set and hDriverStart is 0 then send messages
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* to drivers with indices between cInstalledDrivers and 1.
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*
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* @rdesc returns non-zero if message was broadcast. If the IBDM_SENDMESSAGE
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* flag is set, returns the return result from the driver proc.
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*
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***************************************************************************/
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LONG FAR PASCAL InternalBroadcastDriverMessage(WORD hDriverStart,
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WORD message,
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LONG lParam1,
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LONG lParam2,
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WORD flags)
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{
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LPDRIVERTABLE lpdt;
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LONG result=0;
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int id;
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int idEnd;
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if (!hInstalledDriverList || hDriverStart > cInstalledDrivers)
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return(FALSE);
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if (flags & IBDM_SENDMESSAGE)
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{
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if (!hDriverStart)
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return (FALSE);
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flags &= ~(IBDM_REVERSE | IBDM_ONEINSTANCEONLY);
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idEnd = hDriverStart;
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}
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else
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{
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if (flags & IBDM_REVERSE)
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{
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if (!hDriverStart)
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hDriverStart = cInstalledDrivers;
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idEnd = -1;
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}
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else
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{
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if (!hDriverStart)
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return (FALSE);
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idEnd = cInstalledDrivers;
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}
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}
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hDriverStart--;
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lpdt = (LPDRIVERTABLE)GlobalLock(hInstalledDriverList);
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for (id = hDriverStart; id != idEnd; ((flags & IBDM_REVERSE) ? id-- : id++))
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{
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if (lpdt[id].hModule)
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{
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if ((flags & IBDM_ONEINSTANCEONLY) &&
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!lpdt[id].fFirstEntry)
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continue;
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result =
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(*lpdt[id].lpDriverEntryPoint)(lpdt[id].dwDriverIdentifier,
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id+1,
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message,
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lParam1,
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lParam2);
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}
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}
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GlobalUnlock(hInstalledDriverList);
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return(result);
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}
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/***************************************************************************
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*
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* @doc DDK
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*
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* @api LONG | DrvSendMessage | This function sends a message
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* to a specified driver.
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*
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* @parm HANDLE | hDriver | Specifies the handle of the destination driver.
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*
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* @parm WORD | wMessage | Specifies a driver message.
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*
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* @parm LONG | lParam1 | Specifies the first message parameter.
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*
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* @parm LONG | lParam2 | Specifies the second message parameter.
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*
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* @rdesc Returns the results returned from the driver.
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*
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***************************************************************************/
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LONG API DrvSendMessage(HANDLE hDriver, WORD message, LONG lParam1, LONG lParam2)
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{
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if (fUseWinAPI)
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return (*lpSendDriverMessage)(hDriver, message, lParam1,lParam2);
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return(InternalBroadcastDriverMessage(hDriver,
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message,
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lParam1,
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lParam2,
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IBDM_SENDMESSAGE));
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}
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/**************************************************************************
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*
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* @doc DDK
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*
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* @api LONG | DefDriverProc | This function provides default
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* handling of system messages.
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*
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* @parm DWORD | dwDriverIdentifier | Specifies the identifier of
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* the device driver.
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*
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* @parm HANDLE | hDriver | Specifies the handle of the device driver.
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*
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* @parm WORD | wMessage | Specifies a driver message.
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*
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* @parm LONG | lParam1 | Specifies the first message parameter.
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*
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* @parm LONG | lParam2 | Specifies the second message parameter.
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*
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* @rdesc Returns 1L for DRV_LOAD, DRV_FREE, DRV_ENABLE, and DRV_DISABLE.
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* It returns 0L for all other messages.
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*
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***************************************************************************/
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LONG API DefDriverProc(DWORD dwDriverIdentifier,
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HANDLE hDriver,
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WORD message,
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LONG lParam1,
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LONG lParam2)
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{
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switch (message)
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{
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case DRV_LOAD:
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case DRV_ENABLE:
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case DRV_DISABLE:
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case DRV_FREE:
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return(1L);
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break;
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case DRV_INSTALL:
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return(DRV_OK);
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break;
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}
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return(0L);
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}
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