428 lines
10 KiB
C++
428 lines
10 KiB
C++
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//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1993.
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//
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// File: surrogat.cxx
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//
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// Contents: Main driver for surrogat process for loading DLLs in a
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// process external to client requesting bind.
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//
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// Classes: CShutdown
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//
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// Functions: CShutdown::CShutdown
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// CShutdown::CreateTimer
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// CShutdown::DeleteTimer
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// CShutdown::CanShutdown
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// SurrogatWndProc
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// CreateSurrogatWindow
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// MessagePump
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// WinMain
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//
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// History: 12-Jul-93 Ricksa Created
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//
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//--------------------------------------------------------------------------
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#include <windows.h>
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#include <ole2.h>
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#include <olecom.h>
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#include "oleinit.hxx"
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#include "loadcls.hxx"
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STDAPI_(BOOL) RemConnectionsExist(void);
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DECLARE_INFOLEVEL(Cairole)
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// Name of window class
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const WCHAR *wszSurrogatClassName = L"Surrogate";
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// Timer constants
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const UINT SHUTDOWN_TIMER = 1;
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const UINT SHUTDOWN_CHECK_TIME = 60000;
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// Number of times to sample
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const int _cMaxSamples = 5;
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// Indicate surrogat died with unexpected error
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const UINT SURROGAT_DISASTER_EXIT = 0xFFFFFFFF;
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//+-------------------------------------------------------------------------
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//
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// Class: CShutdown
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//
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// Purpose: Used to compute when to shutdown surrogat
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//
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// Interface: CreateTimer
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// DeleteTimer
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// CanShutdown
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//
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// History: 12-Jul-93 Ricksa Created
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//
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//--------------------------------------------------------------------------
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class CShutdown
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{
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public:
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CShutdown(void);
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void CreateTimer(HWND hwnd);
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void DeleteTimer(void);
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void CanShutdown(void);
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private:
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HWND _hwnd;
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int _cSamplesNoConnections;
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};
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//+-------------------------------------------------------------------------
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//
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// Member: CShutdown::CShutdown
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//
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// Synopsis: Initializes shutdown object
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//
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// History: 12-Jul-93 Ricksa Created
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//
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//--------------------------------------------------------------------------
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inline CShutdown::CShutdown(void) : _cSamplesNoConnections(0)
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{
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// Header does the work.
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CShutdown::CreateTimer
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//
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// Synopsis: Initializes timer used by shutdown processing
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//
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// History: 15-Jul-93 Ricksa Created
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//
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//--------------------------------------------------------------------------
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inline void CShutdown::CreateTimer(HWND hwnd)
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{
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_hwnd = hwnd;
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UINT uRes = SetTimer(_hwnd, SHUTDOWN_TIMER, SHUTDOWN_CHECK_TIME, NULL);
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Win4Assert((uRes != 0) && "Timer creation failed");
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if (uRes == 0)
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{
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// Timer creation failed. It is extremely hard to imagine
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// how this could occur. It would probably be a situation
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// where we are very close to the limits of virtual memory
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// in the system. In any case, we can do nothing but die and
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// wait for the SCM to notice we are dead.
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ExitProcess(SURROGAT_DISASTER_EXIT);
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}
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CShutdown::DeleteTimer
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//
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// Synopsis: Removes timer used by shutdown processing
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//
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// History: 15-Jul-93 Ricksa Created
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//
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//--------------------------------------------------------------------------
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inline void CShutdown::DeleteTimer(void)
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{
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#if DBG == 1
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// The result of KillTimer is really a don't care situation
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// since the process will be exiting but during debugging we
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// want to know when this fails.
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BOOL fKillTimerSucceeded =
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#endif // DBG == 1
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KillTimer(_hwnd, SHUTDOWN_TIMER);
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Win4Assert(fKillTimerSucceeded && "Kill Timer Failed");
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CShutdown::CanShutdown
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//
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// Synopsis: Determine whether it is time for surrogat to shutdown.
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//
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// Algorithm: If we determine that there are currently connections
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// to surrogat, we reset out count of periods of no connections.
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// Otherwise, we bump the count and see whether this exceeds
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// the maximum. If the maximum is exceeded we post a quit
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// message for the window.
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//
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// History: 12-Jul-93 Ricksa Created
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//
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// Notes: This returns its value by posting a quit message to
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// the window which will in turn shutdown surrogat.
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//
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//--------------------------------------------------------------------------
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inline void CShutdown::CanShutdown(void)
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{
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// Are there any connections?
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SCODE sc = RemConnectionsExist();
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if (sc != S_FALSE)
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{
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// Yes reset the connection count
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_cSamplesNoConnections = 0;
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}
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else
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{
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// We exceeded the maximum number time periods without
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// finding a connection so we are ready to stop.
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if (++_cSamplesNoConnections > _cMaxSamples)
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{
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CairoleDebugOut((DEB_TRACE, "Shutting down\n"));
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PostQuitMessage(0);
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}
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}
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}
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// Global object used to determine when surrogat shuts down
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CShutdown g_SurrogatShutdown;
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// Global object for classes stored in DLLs.
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CLoadedClassTable g_SurrogatClasses;
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//+-------------------------------------------------------------------------
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//
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// Function: SurrogatWndProc
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//
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// Synopsis: Process messages to the surrogat window.
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//
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// Arguments: [hWnd] - window handle
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// [message] - message to the window
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// [wParam] - wParam for message
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// [lParam] - lParam for message.
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//
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// Returns: 0
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//
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// Algorithm: On window create this sets up a timer. The only messages
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// that should really come to this window are timer messages
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// which are passed to the timer object for determination
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// as to whether the server should stop or not.
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//
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// History: 12-Jul-93 Ricksa Created
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//
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//--------------------------------------------------------------------------
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long SurrogatWndProc(
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HWND hWnd,
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UINT message,
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WPARAM wParam,
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LPARAM lParam)
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{
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switch (message)
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{
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case WM_CREATE:
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g_SurrogatShutdown.CreateTimer(hWnd);
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break;
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case WM_TIMER:
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// Check if shutdown is possible
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g_SurrogatShutdown.CanShutdown();
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break;
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case WM_CLOSE:
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g_SurrogatShutdown.DeleteTimer();
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break;
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default:
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// Default actions for all other messages.
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return DefWindowProc(hWnd, message, wParam, lParam);
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}
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return 0;
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}
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//+-------------------------------------------------------------------------
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//
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// Function: CreateSurrogatWindow
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//
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// Synopsis: Creates window used by shutdown logic.
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//
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// Arguments: [hInstance] - handle to process.
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//
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// Returns: [TRUE] - window was created successfully
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// [FALSE] - window creation failed
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//
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// Algorithm: First register window class and then create the invisible
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// window.
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//
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// History: 12-Jul-93 Ricksa Created
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//
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//--------------------------------------------------------------------------
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BOOL CreateSurrogatWindow(HINSTANCE hInstance)
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{
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WNDCLASS wc;
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HWND hWnd; // Main window handle.
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/* Fill in window class structure with parameters that describe the */
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/* main window. */
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wc.style = 0;
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wc.lpfnWndProc = SurrogatWndProc;
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wc.cbClsExtra = 0;
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wc.cbWndExtra = 0;
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wc.hInstance = hInstance;
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wc.hIcon = LoadIcon(hInstance, IDI_APPLICATION);
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wc.hCursor = LoadCursor(NULL, IDC_ARROW);
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wc.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
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wc.lpszMenuName = NULL;
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wc.lpszClassName = wszSurrogatClassName;
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/* Register the window class and return success/failure code. */
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if (!RegisterClass(&wc))
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{
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return FALSE;
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}
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// Create a main window for this application instance.
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hWnd = CreateWindow(
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wszSurrogatClassName,
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wszSurrogatClassName,
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WS_OVERLAPPEDWINDOW,
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CW_USEDEFAULT,
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CW_USEDEFAULT,
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CW_USEDEFAULT,
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CW_USEDEFAULT,
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NULL,
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NULL,
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hInstance,
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NULL
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);
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// If window could not be created, return "failure"
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return (hWnd) ? TRUE : FALSE;
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}
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//+-------------------------------------------------------------------------
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//
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// Function: MessagePump
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//
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// Synopsis: Process messages and pass them on to appropriate window.
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//
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// Returns: wParam from quite message.
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//
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// Algorithm: Get the message and translate it and pass it on.
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//
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// History: 12-Jul-93 Ricksa Created
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//
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//--------------------------------------------------------------------------
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int MessagePump(void)
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{
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MSG msg;
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while(GetMessage(&msg, NULL, 0, 0))
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{
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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return msg.wParam;
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}
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//+-------------------------------------------------------------------------
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//
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// Function: WinMain
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//
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// Synopsis: Main driver for surrogat
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//
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// Arguments: [hinst] - handle to process
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// [hinstPrev] - handle to previous instance
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// [pszCmdLine] - command line for the process
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// [nCmdShow] - how to show the main window
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//
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// Returns: Whatever was in quit message
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//
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// Algorithm: This creates the windows for the surrogat shotdown
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// processing first. Then the command line is parsed to
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// get classes and DLLs supported by this surrogat. The
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// classes are then registered and the message pump
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// kicks in. Finally, when a quit message is recieved
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// all registered classes are revoked and the process
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// exits.
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//
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// History: 12-Jul-93 Ricksa Created
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//
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//--------------------------------------------------------------------------
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int WINAPI WinMain(
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HINSTANCE hinst,
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HINSTANCE hinstPrev,
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char *pszCmdLine,
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int nCmdShow)
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{
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CairoleInfoLevel = 0xFFFFFFFF;
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CairoleDebugOut((DEB_TRACE, "Command Line: %s\n", pszCmdLine));
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// Create a hidden window that messages can be sent to particualarly
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// quit and timer messages.
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// BUGBUG: What should we do if this fails in the retail product?
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#if DBG == 1
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BOOL fResult =
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#endif // DBG == 1
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CreateSurrogatWindow(hinst);
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Win4Assert(fResult && "Surrogate window creation failed");
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// Call OleInitalize so classes don't have to.
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COleInit oleinit;
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// Load the list of classes and DLLs provided by the service
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// controller at startup and register classes objects with compobj.
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#if DBG == 1
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fResult =
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#endif // DBG == 1
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g_SurrogatClasses.LoadClassObjects(pszCmdLine);
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Win4Assert(fResult && "LoadClassObjects failed");
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// Create a message pump
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int retval = MessagePump();
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// Deregister class objects
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g_SurrogatClasses.RevokeClasses();
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return retval;
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}
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