542 lines
16 KiB
C
Executable File
542 lines
16 KiB
C
Executable File
/*
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*Copyright (C) 2003-2004 Harold L Hunt II All Rights Reserved.
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*
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*Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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*"Software"), to deal in the Software without restriction, including
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*without limitation the rights to use, copy, modify, merge, publish,
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*distribute, sublicense, and/or sell copies of the Software, and to
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*permit persons to whom the Software is furnished to do so, subject to
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*the following conditions:
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*
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*The above copyright notice and this permission notice shall be
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*included in all copies or substantial portions of the Software.
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*
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*THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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*EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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*MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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*NONINFRINGEMENT. IN NO EVENT SHALL HAROLD L HUNT II BE LIABLE FOR
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*ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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*CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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*WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*Except as contained in this notice, the name of Harold L Hunt II
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*shall not be used in advertising or otherwise to promote the sale, use
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*or other dealings in this Software without prior written authorization
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*from Harold L Hunt II.
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*
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* Authors: Harold L Hunt II
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*/
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#ifdef HAVE_XWIN_CONFIG_H
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#include <xwin-config.h>
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#endif
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#include "win.h"
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#include "dixstruct.h"
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#include <X11/Xatom.h>
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/*
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* Constants
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*/
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#define CLIP_NUM_SELECTIONS 2
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#define CLIP_OWN_PRIMARY 0
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#define CLIP_OWN_CLIPBOARD 1
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/*
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* Local function prototypes
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*/
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DISPATCH_PROC(winProcEstablishConnection);
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DISPATCH_PROC(winProcQueryTree);
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DISPATCH_PROC(winProcSetSelectionOwner);
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/*
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* References to external symbols
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*/
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extern Bool g_fUnicodeSupport;
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extern int g_iNumScreens;
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extern unsigned int g_uiAuthDataLen;
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extern char *g_pAuthData;
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extern Bool g_fXdmcpEnabled;
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extern Bool g_fClipboardLaunched;
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extern Bool g_fClipboardStarted;
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extern Bool g_fClipboard;
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extern Window g_iClipboardWindow;
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extern Atom g_atomLastOwnedSelection;
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extern HWND g_hwndClipboard;
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extern winDispatchProcPtr winProcEstablishConnectionOrig;
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extern winDispatchProcPtr winProcQueryTreeOrig;
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extern winDispatchProcPtr winProcSetSelectionOwnerOrig;
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/*
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* Wrapper for internal QueryTree function.
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* Hides the clipboard client when it is the only client remaining.
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*/
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int
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winProcQueryTree (ClientPtr client)
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{
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int iReturn;
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/*
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* This procedure is only used for initialization.
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* We can unwrap the original procedure at this point
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* so that this function is no longer called until the
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* server resets and the function is wrapped again.
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*/
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ProcVector[X_QueryTree] = winProcQueryTreeOrig;
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/*
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* Call original function and bail if it fails.
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* NOTE: We must do this first, since we need XdmcpOpenDisplay
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* to be called before we initialize our clipboard client.
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*/
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iReturn = (*winProcQueryTreeOrig) (client);
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if (iReturn != 0)
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{
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ErrorF ("winProcQueryTree - ProcQueryTree failed, bailing.\n");
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return iReturn;
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}
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/* Make errors more obvious */
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winProcQueryTreeOrig = NULL;
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/* Do nothing if clipboard is not enabled */
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if (!g_fClipboard)
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{
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ErrorF ("winProcQueryTree - Clipboard is not enabled, "
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"returning.\n");
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return iReturn;
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}
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/* If the clipboard client has already been started, abort */
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if (g_fClipboardLaunched)
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{
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ErrorF ("winProcQueryTree - Clipboard client already "
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"launched, returning.\n");
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return iReturn;
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}
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/* Startup the clipboard client if clipboard mode is being used */
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if (g_fXdmcpEnabled && g_fClipboard)
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{
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/*
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* NOTE: The clipboard client is started here for a reason:
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* 1) Assume you are using XDMCP (e.g. XWin -query %hostname%)
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* 2) If the clipboard client attaches during X Server startup,
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* then it becomes the "magic client" that causes the X Server
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* to reset if it exits.
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* 3) XDMCP calls KillAllClients when it starts up.
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* 4) The clipboard client is a client, so it is killed.
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* 5) The clipboard client is the "magic client", so the X Server
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* resets itself.
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* 6) This repeats ad infinitum.
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* 7) We avoid this by waiting until at least one client (could
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* be XDM, could be another client) connects, which makes it
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* almost certain that the clipboard client will not connect
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* until after XDM when using XDMCP.
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* 8) Unfortunately, there is another problem.
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* 9) XDM walks the list of windows with XQueryTree,
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* killing any client it finds with a window.
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* 10)Thus, when using XDMCP we wait until the first call
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* to ProcQueryTree before we startup the clipboard client.
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* This should prevent XDM from finding the clipboard client,
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* since it has not yet created a window.
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* 11)Startup when not using XDMCP is handled in
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* winProcEstablishConnection.
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*/
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/* Create the clipboard client thread */
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if (!winInitClipboard ())
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{
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ErrorF ("winProcQueryTree - winClipboardInit "
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"failed.\n");
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return iReturn;
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}
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ErrorF ("winProcQueryTree - winInitClipboard returned.\n");
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}
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/* Flag that clipboard client has been launched */
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g_fClipboardLaunched = TRUE;
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return iReturn;
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}
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/*
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* Wrapper for internal EstablishConnection function.
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* Initializes internal clients that must not be started until
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* an external client has connected.
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*/
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int
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winProcEstablishConnection (ClientPtr client)
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{
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int iReturn;
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static int s_iCallCount = 0;
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static unsigned long s_ulServerGeneration = 0;
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ErrorF ("winProcEstablishConnection - Hello\n");
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/* Do nothing if clipboard is not enabled */
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if (!g_fClipboard)
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{
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ErrorF ("winProcEstablishConnection - Clipboard is not enabled, "
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"returning.\n");
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/* Unwrap the original function, call it, and return */
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InitialVector[2] = winProcEstablishConnectionOrig;
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iReturn = (*winProcEstablishConnectionOrig) (client);
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winProcEstablishConnectionOrig = NULL;
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return iReturn;
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}
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/* Watch for server reset */
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if (s_ulServerGeneration != serverGeneration)
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{
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/* Save new generation number */
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s_ulServerGeneration = serverGeneration;
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/* Reset call count */
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s_iCallCount = 0;
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}
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/* Increment call count */
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++s_iCallCount;
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/* Wait for second call when Xdmcp is enabled */
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if (g_fXdmcpEnabled
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&& !g_fClipboardLaunched
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&& s_iCallCount < 4)
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{
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ErrorF ("winProcEstablishConnection - Xdmcp enabled, waiting to "
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"start clipboard client until fourth call.\n");
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return (*winProcEstablishConnectionOrig) (client);
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}
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/*
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* This procedure is only used for initialization.
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* We can unwrap the original procedure at this point
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* so that this function is no longer called until the
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* server resets and the function is wrapped again.
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*/
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InitialVector[2] = winProcEstablishConnectionOrig;
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/*
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* Call original function and bail if it fails.
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* NOTE: We must do this first, since we need XdmcpOpenDisplay
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* to be called before we initialize our clipboard client.
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*/
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iReturn = (*winProcEstablishConnectionOrig) (client);
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if (iReturn != 0)
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{
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ErrorF ("winProcEstablishConnection - ProcEstablishConnection "
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"failed, bailing.\n");
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return iReturn;
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}
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/* Clear original function pointer */
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winProcEstablishConnectionOrig = NULL;
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/* If the clipboard client has already been started, abort */
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if (g_fClipboardLaunched)
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{
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ErrorF ("winProcEstablishConnection - Clipboard client already "
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"launched, returning.\n");
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return iReturn;
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}
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/* Startup the clipboard client if clipboard mode is being used */
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if (g_fClipboard)
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{
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/*
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* NOTE: The clipboard client is started here for a reason:
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* 1) Assume you are using XDMCP (e.g. XWin -query %hostname%)
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* 2) If the clipboard client attaches during X Server startup,
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* then it becomes the "magic client" that causes the X Server
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* to reset if it exits.
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* 3) XDMCP calls KillAllClients when it starts up.
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* 4) The clipboard client is a client, so it is killed.
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* 5) The clipboard client is the "magic client", so the X Server
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* resets itself.
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* 6) This repeats ad infinitum.
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* 7) We avoid this by waiting until at least one client (could
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* be XDM, could be another client) connects, which makes it
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* almost certain that the clipboard client will not connect
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* until after XDM when using XDMCP.
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* 8) Unfortunately, there is another problem.
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* 9) XDM walks the list of windows with XQueryTree,
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* killing any client it finds with a window.
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* 10)Thus, when using XDMCP we wait until the second call
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* to ProcEstablishCeonnection before we startup the clipboard
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* client. This should prevent XDM from finding the clipboard
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* client, since it has not yet created a window.
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*/
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/* Create the clipboard client thread */
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if (!winInitClipboard ())
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{
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ErrorF ("winProcEstablishConnection - winClipboardInit "
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"failed.\n");
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return iReturn;
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}
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ErrorF ("winProcEstablishConnection - winInitClipboard returned.\n");
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}
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/* Flag that clipboard client has been launched */
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g_fClipboardLaunched = TRUE;
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return iReturn;
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}
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/*
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* Wrapper for internal SetSelectionOwner function.
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* Grabs ownership of Windows clipboard when X11 clipboard owner changes.
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*/
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int
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winProcSetSelectionOwner (ClientPtr client)
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{
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int i;
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DrawablePtr pDrawable;
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WindowPtr pWindow = None;
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Bool fOwnedToNotOwned = FALSE;
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static Window s_iOwners[CLIP_NUM_SELECTIONS] = {None};
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static unsigned long s_ulServerGeneration = 0;
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REQUEST(xSetSelectionOwnerReq);
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REQUEST_SIZE_MATCH(xSetSelectionOwnerReq);
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#if 0
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ErrorF ("winProcSetSelectionOwner - Hello.\n");
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#endif
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/* Watch for server reset */
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if (s_ulServerGeneration != serverGeneration)
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{
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/* Save new generation number */
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s_ulServerGeneration = serverGeneration;
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/* Initialize static variables */
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for (i = 0; i < CLIP_NUM_SELECTIONS; ++i)
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s_iOwners[i] = None;
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}
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/* Abort if clipboard not completely initialized yet */
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if (!g_fClipboardStarted)
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{
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ErrorF ("winProcSetSelectionOwner - Clipboard not yet started, "
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"aborting.\n");
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goto winProcSetSelectionOwner_Done;
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}
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/* Grab window if we have one */
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if (None != stuff->window)
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{
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/* Grab the Window from the request */
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int rc = dixLookupWindow(&pWindow, stuff->window, client, DixReadAccess);
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if (rc != Success) {
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ErrorF ("winProcSetSelectionOwner - Found BadWindow, aborting.\n");
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goto winProcSetSelectionOwner_Done;
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}
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}
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/* Now we either have a valid window or None */
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/* Save selection owners for monitored selections, ignore other selections */
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if (XA_PRIMARY == stuff->selection)
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{
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/* Look for owned -> not owned transition */
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if (None == stuff->window
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&& None != s_iOwners[CLIP_OWN_PRIMARY])
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{
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fOwnedToNotOwned = TRUE;
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#if 0
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ErrorF ("winProcSetSelectionOwner - PRIMARY - Going from "
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"owned to not owned.\n");
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#endif
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/* Adjust last owned selection */
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if (None != s_iOwners[CLIP_OWN_CLIPBOARD])
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g_atomLastOwnedSelection = MakeAtom ("CLIPBOARD", 9, TRUE);
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else
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g_atomLastOwnedSelection = None;
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}
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/* Save new selection owner or None */
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s_iOwners[CLIP_OWN_PRIMARY] = stuff->window;
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#if 0
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ErrorF ("winProcSetSelectionOwner - PRIMARY - Now owned by: %d\n",
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stuff->window);
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#endif
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}
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else if (MakeAtom ("CLIPBOARD", 9, TRUE) == stuff->selection)
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{
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/* Look for owned -> not owned transition */
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if (None == stuff->window
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&& None != s_iOwners[CLIP_OWN_CLIPBOARD])
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{
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fOwnedToNotOwned = TRUE;
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#if 0
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ErrorF ("winProcSetSelectionOwner - CLIPBOARD - Going from "
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"owned to not owned.\n");
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#endif
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/* Adjust last owned selection */
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if (None != s_iOwners[CLIP_OWN_PRIMARY])
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g_atomLastOwnedSelection = XA_PRIMARY;
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else
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g_atomLastOwnedSelection = None;
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}
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/* Save new selection owner or None */
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s_iOwners[CLIP_OWN_CLIPBOARD] = stuff->window;
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#if 0
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ErrorF ("winProcSetSelectionOwner - CLIPBOARD - Now owned by: %d\n",
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stuff->window);
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#endif
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}
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else
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goto winProcSetSelectionOwner_Done;
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/*
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* At this point, if one of the selections is still owned by the
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* clipboard manager then it should be marked as unowned since
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* we will be taking ownership of the Win32 clipboard.
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*/
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if (g_iClipboardWindow == s_iOwners[CLIP_OWN_PRIMARY])
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s_iOwners[CLIP_OWN_PRIMARY] = None;
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if (g_iClipboardWindow == s_iOwners[CLIP_OWN_CLIPBOARD])
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s_iOwners[CLIP_OWN_CLIPBOARD] = None;
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/*
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* Handle case when selection is being disowned,
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* WM_DRAWCLIPBOARD did not do the disowning,
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* both monitored selections are no longer owned,
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* an owned to not owned transition was detected,
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* and we currently own the Win32 clipboard.
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*/
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if (None == stuff->window
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&& (None == s_iOwners[CLIP_OWN_PRIMARY]
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|| g_iClipboardWindow == s_iOwners[CLIP_OWN_PRIMARY])
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&& (None == s_iOwners[CLIP_OWN_CLIPBOARD]
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|| g_iClipboardWindow == s_iOwners[CLIP_OWN_CLIPBOARD])
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&& fOwnedToNotOwned
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&& g_hwndClipboard != NULL
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&& g_hwndClipboard == GetClipboardOwner ())
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{
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#if 0
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ErrorF ("winProcSetSelectionOwner - We currently own the "
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"clipboard and neither the PRIMARY nor the CLIPBOARD "
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"selections are owned, releasing ownership of Win32 "
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"clipboard.\n");
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#endif
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/* Release ownership of the Windows clipboard */
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OpenClipboard (NULL);
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EmptyClipboard ();
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CloseClipboard ();
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/* Clear X selection ownership (might still be marked as us owning) */
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s_iOwners[CLIP_OWN_PRIMARY] = None;
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s_iOwners[CLIP_OWN_CLIPBOARD] = None;
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goto winProcSetSelectionOwner_Done;
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}
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/* Abort if no window at this point */
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if (None == stuff->window)
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{
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#if 0
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ErrorF ("winProcSetSelectionOwner - No window, returning.\n");
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#endif
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goto winProcSetSelectionOwner_Done;
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}
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/* Abort if invalid selection */
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if (!ValidAtom (stuff->selection))
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{
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ErrorF ("winProcSetSelectionOwner - Found BadAtom, aborting.\n");
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goto winProcSetSelectionOwner_Done;
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}
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/* Cast Window to Drawable */
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pDrawable = (DrawablePtr) pWindow;
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/* Abort if clipboard manager is owning the selection */
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if (pDrawable->id == g_iClipboardWindow)
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{
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#if 0
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ErrorF ("winProcSetSelectionOwner - We changed ownership, "
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"aborting.\n");
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#endif
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goto winProcSetSelectionOwner_Done;
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}
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/* Abort if root window is taking ownership */
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if (pDrawable->id == 0)
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{
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ErrorF ("winProcSetSelectionOwner - Root window taking ownership, "
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"aborting\n");
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goto winProcSetSelectionOwner_Done;
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}
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/* Close clipboard if we have it open already */
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if (GetOpenClipboardWindow () == g_hwndClipboard)
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{
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CloseClipboard ();
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}
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/* Access the Windows clipboard */
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if (!OpenClipboard (g_hwndClipboard))
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{
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ErrorF ("winProcSetSelectionOwner - OpenClipboard () failed: %08x\n",
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(int) GetLastError ());
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goto winProcSetSelectionOwner_Done;
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}
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/* Take ownership of the Windows clipboard */
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if (!EmptyClipboard ())
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{
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ErrorF ("winProcSetSelectionOwner - EmptyClipboard () failed: %08x\n",
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(int) GetLastError ());
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goto winProcSetSelectionOwner_Done;
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}
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/* Advertise Unicode if we support it */
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if (g_fUnicodeSupport)
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SetClipboardData (CF_UNICODETEXT, NULL);
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/* Always advertise regular text */
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SetClipboardData (CF_TEXT, NULL);
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/* Save handle to last owned selection */
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g_atomLastOwnedSelection = stuff->selection;
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/* Release the clipboard */
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if (!CloseClipboard ())
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{
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ErrorF ("winProcSetSelectionOwner - CloseClipboard () failed: "
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"%08x\n",
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(int) GetLastError ());
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goto winProcSetSelectionOwner_Done;
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}
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winProcSetSelectionOwner_Done:
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return (*winProcSetSelectionOwnerOrig) (client);
|
|
}
|