571 lines
12 KiB
C
571 lines
12 KiB
C
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/*==========================================================================
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*
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* Copyright (C) 1994-1995 Microsoft Corporation. All Rights Reserved.
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*
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* File: w95hack.c
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* Content: Win95 hack-o-rama code
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* This is a HACK to handle the fact that Win95 doesn't notify
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* a DLL when a process is destroyed.
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* History:
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* Date By Reason
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* ==== == ======
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* 28-mar-95 craige initial implementation
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* 01-apr-95 craige happy fun joy updated header file
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* 06-apr-95 craige reworked for new ddhelp
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* 09-may-95 craige loading any DLL
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* 16-sep-95 craige bug 1117: must UnmapViewOfFile before closing handle
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* 29-nov-95 angusm added HelperCreateDSFocusThread
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* 18-jul-96 andyco added Helper(Add/)DeleteDPlayServer
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* 12-oct-96 colinmc added new service to get DDHELP to get its own handle
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* for communicating with the DirectSound VXD
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*
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***************************************************************************/
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#undef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include <mmsystem.h>
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#include <mmreg.h>
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#include "w95help.h"
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#include "dpf.h"
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//extern DWORD * pdwHelperPid;
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//extern HANDLE * phModule; // must be defined
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extern DWORD dwHelperPid;
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extern HANDLE hModule; // must be defined
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/*
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* sendRequest
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*
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* communicate a request to DDHELP
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*/
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static BOOL sendRequest( LPDDHELPDATA req_phd )
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{
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LPDDHELPDATA phd;
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HANDLE hmem;
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HANDLE hmutex;
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HANDLE hackevent;
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HANDLE hstartevent;
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BOOL rc;
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/*
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* get events start/ack events
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*/
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hstartevent = CreateEvent( NULL, FALSE, FALSE, DDHELP_EVENT_NAME );
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if( hstartevent == NULL )
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{
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return FALSE;
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}
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hackevent = CreateEvent( NULL, FALSE, FALSE, DDHELP_ACK_EVENT_NAME );
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if( hackevent == NULL )
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{
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CloseHandle( hstartevent );
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return FALSE;
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}
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/*
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* create shared memory area
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*/
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hmem = CreateFileMapping( INVALID_HANDLE_VALUE, NULL,
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PAGE_READWRITE, 0, sizeof( DDHELPDATA ),
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DDHELP_SHARED_NAME );
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if( hmem == NULL )
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{
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DPF( 1, "Could not create file mapping!" );
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CloseHandle( hstartevent );
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CloseHandle( hackevent );
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return FALSE;
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}
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phd = (LPDDHELPDATA) MapViewOfFile( hmem, FILE_MAP_ALL_ACCESS, 0, 0, 0 );
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if( phd == NULL )
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{
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DPF( 1, "Could not create view of file!" );
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CloseHandle( hmem );
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CloseHandle( hstartevent );
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CloseHandle( hackevent );
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return FALSE;
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}
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/*
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* wait for access to the shared memory
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*/
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hmutex = OpenMutex( SYNCHRONIZE, FALSE, DDHELP_MUTEX_NAME );
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if( hmutex == NULL )
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{
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DPF( 1, "Could not create mutex!" );
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UnmapViewOfFile( phd );
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CloseHandle( hmem );
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CloseHandle( hstartevent );
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CloseHandle( hackevent );
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return FALSE;
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}
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WaitForSingleObject( hmutex, INFINITE );
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/*
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* wake up DDHELP with our request
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*/
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memcpy( phd, req_phd, sizeof( DDHELPDATA ) );
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phd->req_id = hModule;
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if( SetEvent( hstartevent ) )
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{
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WaitForSingleObject( hackevent, INFINITE );
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memcpy( req_phd, phd, sizeof( DDHELPDATA ) );
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rc = TRUE;
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}
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else
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{
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DPF( 1, "Could not signal event to notify DDHELP" );
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rc = FALSE;
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}
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/*
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* done with things
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*/
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ReleaseMutex( hmutex );
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CloseHandle( hmutex );
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CloseHandle( hstartevent );
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CloseHandle( hackevent );
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UnmapViewOfFile( phd );
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CloseHandle( hmem );
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return rc;
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} /* sendRequest */
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/*
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* DoneWithHelperProcess
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*/
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void DoneWithHelperProcess( void )
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{
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DDHELPDATA hd;
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if( dwHelperPid == 0 )
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{
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return;
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}
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hd.req = DDHELPREQ_FREEDCLIST;
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sendRequest( &hd );
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} /* DoneWithHelperProcess */
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/*
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* WaitForHelperStartup
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*/
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BOOL WaitForHelperStartup( void )
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{
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HANDLE hevent;
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DWORD rc;
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hevent = CreateEvent( NULL, TRUE, FALSE, DDHELP_STARTUP_EVENT_NAME );
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if( hevent == NULL )
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{
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return FALSE;
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}
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DPF( 3, "Wait DDHELP startup event to be triggered" );
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rc = WaitForSingleObject( hevent, INFINITE );
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CloseHandle( hevent );
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return TRUE;
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} /* WaitForHelperStartup */
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/*
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* HelperLoadDLL
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*
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* get the helper to load a DLL for us.
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*/
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DWORD HelperLoadDLL( LPSTR dllname, LPSTR fnname, DWORD context )
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{
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DDHELPDATA hd;
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DWORD rc = 0;
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if( dllname != NULL )
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{
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hd.req = DDHELPREQ_LOADDLL;
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lstrcpy( hd.fname, dllname );
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if( fnname != NULL )
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{
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strcpy( hd.func, fnname );
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hd.context = context;
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DPF( 3, "Context=%08lx", context );
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}
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else
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{
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hd.func[0] = 0;
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}
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DPF( 3, "Asking DDHELP to load DLL %s", dllname );
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sendRequest( &hd );
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rc = hd.dwReturn;
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}
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return rc;
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} /* HelperLoadDLL */
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/*
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* HelperCreateThread
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*/
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void HelperCreateThread( void )
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{
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DDHELPDATA hd;
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hd.req = DDHELPREQ_CREATEHELPERTHREAD;
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sendRequest( &hd );
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} /* HelperCreateThread */
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/*
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* SignalNewProcess
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*
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* Signal DDHELP that a new process has arrived. This is called with the
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* DLL lock taken, so global vars are safe
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*/
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void SignalNewProcess( DWORD pid, LPHELPNOTIFYPROC proc )
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{
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DDHELPDATA hd;
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if( pid == dwHelperPid )
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{
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DPF( 3, "Helper connected to DLL - no signal required" );
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return;
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}
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DPF( 3, "Signalling DDHELP that a new process has connected" );
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hd.req = DDHELPREQ_NEWPID;
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hd.pid = pid;
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hd.lpNotify = proc;
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sendRequest( &hd );
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} /* SignalNewProcess */
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/*
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* SignalNewDriver
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*
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* Signal DDHELP that a new driver has been loaded. This is called with the
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* DLL lock taken, so global vars are safe
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*/
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void SignalNewDriver( LPSTR fname, BOOL isdisp )
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{
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DDHELPDATA hd;
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DPF( 3, "Signalling DDHELP to create a new DC" );
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hd.req = DDHELPREQ_NEWDC;
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hd.isdisp = isdisp;
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lstrcpy( hd.fname, fname );
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sendRequest( &hd );
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} /* SignalNewDriver */
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/*
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* CreateHelperProcess
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*/
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BOOL CreateHelperProcess( LPDWORD ppid )
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{
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if( dwHelperPid == 0 )
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{
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STARTUPINFO si;
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PROCESS_INFORMATION pi;
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HANDLE h;
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h = OpenEvent( SYNCHRONIZE, FALSE, DDHELP_STARTUP_EVENT_NAME );
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if( h == NULL )
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{
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si.cb = sizeof(STARTUPINFO);
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si.lpReserved = NULL;
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si.lpDesktop = NULL;
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si.lpTitle = NULL;
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si.dwFlags = 0;
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si.cbReserved2 = 0;
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si.lpReserved2 = NULL;
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DPF( 3, "Creating helper process now" );
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if( !CreateProcess(NULL, "ddhelp.exe", NULL, NULL, FALSE,
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NORMAL_PRIORITY_CLASS,
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NULL, NULL, &si, &pi) )
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{
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DPF( 2, "Could not create DDHELP.EXE" );
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return FALSE;
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}
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dwHelperPid = pi.dwProcessId;
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DPF( 3, "Helper rocess created" );
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}
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else
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{
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DDHELPDATA hd;
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DPF( 3, "DDHELP already exists, waiting for DDHELP event" );
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WaitForSingleObject( h, INFINITE );
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CloseHandle( h );
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DPF( 3, "Asking for DDHELP pid" );
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hd.req = DDHELPREQ_RETURNHELPERPID;
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sendRequest( &hd );
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dwHelperPid = hd.pid;
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DPF( 3, "DDHELP pid = %08lx", dwHelperPid );
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}
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*ppid = dwHelperPid;
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return TRUE;
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}
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*ppid = dwHelperPid;
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return FALSE;
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} /* CreateHelperProcess */
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#ifndef WINNT //this is Just For Now... dsound will get the help it needs..jeffno 951206
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/*
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* HelperWaveOpen
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*
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* get the helper to load a DLL for us.
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*/
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DWORD HelperWaveOpen( LPVOID lphwo, DWORD dwDeviceID, LPVOID pwfx )
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{
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DDHELPDATA hd;
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if( (lphwo != NULL) && (pwfx != NULL) )
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{
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hd.req = DDHELPREQ_WAVEOPEN;
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hd.pData1 = lphwo;
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hd.dwData1 = dwDeviceID;
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hd.dwData2 = (DWORD)pwfx;
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DPF( 3, "Asking DDHELP to Open Wave Device %d", dwDeviceID );
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sendRequest( &hd );
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return hd.dwReturn;
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}
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else
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{
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DPF( 3, "Helper Wave Open param error");
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return MMSYSERR_ERROR;
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}
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} /* HelperWaveOpen */
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/*
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* HelperWaveClose
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*
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* get the helper to load a DLL for us.
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*/
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DWORD HelperWaveClose( DWORD hwo )
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{
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DDHELPDATA hd;
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if( (hwo != 0) )
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{
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hd.req = DDHELPREQ_WAVECLOSE;
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hd.dwData1 = hwo;
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DPF( 3, "Asking DDHELP to Close Wave Device ");
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sendRequest( &hd );
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return hd.dwReturn;
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}
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else
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{
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DPF( 3, "Helper Wave Close param error");
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return MMSYSERR_ERROR;
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}
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} /* HelperWaveClose */
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/*
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* HelperCreateTimer
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*
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* get the helper to load a DLL for us.
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*/
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DWORD HelperCreateTimer( DWORD dwResolution,
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LPVOID pTimerProc,
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DWORD dwInstanceData )
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{
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DDHELPDATA hd;
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if( (dwResolution != 0) && (pTimerProc != NULL) )
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{
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hd.req = DDHELPREQ_CREATETIMER;
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hd.pData1 = pTimerProc;
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hd.dwData1 = dwResolution;
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hd.dwData2 = dwInstanceData;
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DPF( 3, "Asking DDHELP to Create Timer" );
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sendRequest( &hd );
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return hd.dwReturn;
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}
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else
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{
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DPF( 3, "Helper Wave Close param error");
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return MMSYSERR_ERROR;
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}
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} /* HelperCreateTimer */
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/*
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* HelperKillTimer
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*
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* get the helper to load a DLL for us.
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*/
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DWORD HelperKillTimer( DWORD dwTimerID )
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{
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DDHELPDATA hd;
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if( (dwTimerID != 0) )
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{
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hd.req = DDHELPREQ_KILLTIMER;
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hd.dwData1 = dwTimerID;
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DPF( 3, "Asking DDHELP to KILL Timer %X", dwTimerID );
|
||
|
|
sendRequest( &hd );
|
||
|
|
return hd.dwReturn;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
DPF( 3, "Helper Wave Close param error");
|
||
|
|
return MMSYSERR_ERROR;
|
||
|
|
}
|
||
|
|
|
||
|
|
} /* HelperKillTimer */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* HelperCreateDSMixerThread
|
||
|
|
*
|
||
|
|
* get the helper to create a mixer thread.
|
||
|
|
*/
|
||
|
|
HANDLE HelperCreateDSMixerThread( LPTHREAD_START_ROUTINE pfnThreadFunc,
|
||
|
|
LPDWORD pdwThreadParam,
|
||
|
|
DWORD dwFlags,
|
||
|
|
LPDWORD pThreadId )
|
||
|
|
{
|
||
|
|
DDHELPDATA hd;
|
||
|
|
|
||
|
|
hd.req = DDHELPREQ_CREATEDSMIXERTHREAD;
|
||
|
|
hd.pData1 = pfnThreadFunc;
|
||
|
|
hd.dwData1 = (DWORD)pdwThreadParam;
|
||
|
|
hd.dwData2 = dwFlags;
|
||
|
|
hd.pData2 = pThreadId;
|
||
|
|
|
||
|
|
sendRequest( &hd );
|
||
|
|
return (HANDLE)hd.dwReturn;
|
||
|
|
} /* HelperCreateDSMixerThread
|
||
|
|
|
||
|
|
/*
|
||
|
|
* HelperCreateDSFocusThread
|
||
|
|
*
|
||
|
|
* get the helper to create a sound focus thread.
|
||
|
|
*/
|
||
|
|
HANDLE HelperCreateDSFocusThread( LPTHREAD_START_ROUTINE pfnThreadFunc,
|
||
|
|
LPDWORD pdwThreadParam,
|
||
|
|
DWORD dwFlags,
|
||
|
|
LPDWORD pThreadId )
|
||
|
|
{
|
||
|
|
DDHELPDATA hd;
|
||
|
|
|
||
|
|
hd.req = DDHELPREQ_CREATEDSFOCUSTHREAD;
|
||
|
|
hd.pData1 = pfnThreadFunc;
|
||
|
|
hd.dwData1 = (DWORD)pdwThreadParam;
|
||
|
|
hd.dwData2 = dwFlags;
|
||
|
|
hd.pData2 = pThreadId;
|
||
|
|
|
||
|
|
sendRequest( &hd );
|
||
|
|
return (HANDLE)hd.dwReturn;
|
||
|
|
} /* HelperCreateDSFocusThread
|
||
|
|
|
||
|
|
/*
|
||
|
|
* HelperCallDSEmulatorCleanup
|
||
|
|
*
|
||
|
|
* Call the DirectSound function which cleans up MMSYSTEM handles
|
||
|
|
*/
|
||
|
|
void HelperCallDSEmulatorCleanup( LPVOID callback,
|
||
|
|
LPVOID pDirectSound )
|
||
|
|
{
|
||
|
|
DDHELPDATA hd;
|
||
|
|
|
||
|
|
hd.req = DDHELPREQ_CALLDSCLEANUP;
|
||
|
|
hd.pData1 = callback;
|
||
|
|
hd.pData2 = pDirectSound;
|
||
|
|
|
||
|
|
sendRequest( &hd );
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif //not winnt -just for now-jeffno
|
||
|
|
|
||
|
|
/*
|
||
|
|
* HelperCreateModeSetThread
|
||
|
|
*
|
||
|
|
* get the helper to load a DLL for us.
|
||
|
|
*/
|
||
|
|
BOOL HelperCreateModeSetThread(
|
||
|
|
LPVOID callback,
|
||
|
|
HANDLE *ph,
|
||
|
|
LPVOID lpdd,
|
||
|
|
DWORD hInstance )
|
||
|
|
{
|
||
|
|
DDHELPDATA hd;
|
||
|
|
HANDLE h;
|
||
|
|
char str[64];
|
||
|
|
|
||
|
|
hd.req = DDHELPREQ_CREATEMODESETTHREAD;
|
||
|
|
hd.lpModeSetNotify = callback;
|
||
|
|
hd.pData1 = lpdd;
|
||
|
|
hd.dwData1 = hInstance;
|
||
|
|
sendRequest( &hd );
|
||
|
|
wsprintf( str, DDHELP_MODESET_EVENT_NAME, hInstance );
|
||
|
|
DPF( 3, "Trying to open event \"%s\"", str );
|
||
|
|
h = OpenEvent( SYNCHRONIZE, FALSE, str );
|
||
|
|
if( h == NULL )
|
||
|
|
{
|
||
|
|
DPF( 3, "Could not open modeset event!" );
|
||
|
|
*ph = NULL;
|
||
|
|
return FALSE;
|
||
|
|
}
|
||
|
|
*ph = h;
|
||
|
|
DPF( 1, "HelperCreateModeSetThread GotEvent: %08lx", h );
|
||
|
|
return TRUE;
|
||
|
|
|
||
|
|
} /* HelperCreateModeSetThread */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* HelperKillModeSetThread
|
||
|
|
*
|
||
|
|
* get the helper to load a DLL for us.
|
||
|
|
*/
|
||
|
|
void HelperKillModeSetThread( DWORD hInstance )
|
||
|
|
{
|
||
|
|
DDHELPDATA hd;
|
||
|
|
|
||
|
|
hd.req = DDHELPREQ_KILLMODESETTHREAD;
|
||
|
|
hd.dwData1 = hInstance;
|
||
|
|
sendRequest( &hd );
|
||
|
|
|
||
|
|
} /* HelperKillModeSetThread */
|
||
|
|
|
||
|
|
|
||
|
|
// notify dphelp.c that we have a new server on this system
|
||
|
|
BOOL HelperAddDPlayServer(DWORD port)
|
||
|
|
{
|
||
|
|
DDHELPDATA hd;
|
||
|
|
DWORD pid = GetCurrentProcessId();
|
||
|
|
|
||
|
|
hd.req = DDHELPREQ_DPLAYADDSERVER;
|
||
|
|
hd.pid = pid;
|
||
|
|
hd. dwData1 = port;
|
||
|
|
return sendRequest(&hd);
|
||
|
|
|
||
|
|
} // HelperAddDPlayServer
|
||
|
|
|
||
|
|
// server is going away
|
||
|
|
BOOL HelperDeleteDPlayServer(void)
|
||
|
|
{
|
||
|
|
DDHELPDATA hd;
|
||
|
|
DWORD pid = GetCurrentProcessId();
|
||
|
|
|
||
|
|
hd.req = DDHELPREQ_DPLAYDELETESERVER;
|
||
|
|
hd.pid = pid;
|
||
|
|
return sendRequest(&hd);
|
||
|
|
|
||
|
|
} // HelperDeleteDPlayServer
|
||
|
|
|
||
|
|
#ifdef USE_ALIAS
|
||
|
|
/*
|
||
|
|
* Get DDHELP to load the DirectSound VXD (if it has not
|
||
|
|
* already done so) and return a handle to the VXD)
|
||
|
|
*/
|
||
|
|
HANDLE HelperGetDSVxd( void )
|
||
|
|
{
|
||
|
|
DDHELPDATA hd;
|
||
|
|
hd.req = DDHELPREQ_GETDSVXDHANDLE;
|
||
|
|
sendRequest( &hd );
|
||
|
|
return (HANDLE) hd.dwReturn;
|
||
|
|
} /* HelperGetDSVxd */
|
||
|
|
#endif /* USE_ALIAS */
|