xref: /xsrc/external/mit/xorg-server/dist/hw/xwin/winmultiwindowwm.c

/*
 *Copyright (C) 1994-2000 The XFree86 Project, Inc. All Rights Reserved.
 *Copyright (C) Colin Harrison 2005-2009
 *
 *Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 *"Software"), to deal in the Software without restriction, including
 *without limitation the rights to use, copy, modify, merge, publish,
 *distribute, sublicense, and/or sell copies of the Software, and to
 *permit persons to whom the Software is furnished to do so, subject to
 *the following conditions:
 *
 *The above copyright notice and this permission notice shall be
 *included in all copies or substantial portions of the Software.
 *
 *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *NONINFRINGEMENT. IN NO EVENT SHALL THE XFREE86 PROJECT BE LIABLE FOR
 *ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 *CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 *Except as contained in this notice, the name of the XFree86 Project
 *shall not be used in advertising or otherwise to promote the sale, use
 *or other dealings in this Software without prior written authorization
 *from the XFree86 Project.
 *
 * Authors:	Kensuke Matsuzaki
 *              Colin Harrison
 */

/* X headers */
#ifdef HAVE_XWIN_CONFIG_H
#include <xwin-config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#ifdef __CYGWIN__
#include <sys/select.h>
#endif
#include <fcntl.h>
#include <setjmp.h>
#define HANDLE void *
#include <pthread.h>
#undef HANDLE
#include <xcb/xcb.h>
#include <xcb/xcb_icccm.h>
#include <xcb/xcb_ewmh.h>
#include <xcb/xcb_aux.h>

#include <X11/Xwindows.h>

/* Local headers */
#include "X11/Xdefs.h" // for Bool type
#include "winwindow.h"
#include "winprefs.h"
#include "window.h"
#include "pixmapstr.h"
#include "windowstr.h"
#include "winglobals.h"
#include "windisplay.h"
#include "winmultiwindowicons.h"

/* We need the native HWND atom for intWM, so for consistency use the
   same name as extWM does */
#define WINDOWSWM_NATIVE_HWND "_WINDOWSWM_NATIVE_HWND"

#ifndef HOST_NAME_MAX
#define HOST_NAME_MAX 255
#endif

extern void winDebug(const char *format, ...);
extern void winReshapeMultiWindow(WindowPtr pWin);
extern void winUpdateRgnMultiWindow(WindowPtr pWin);
extern xcb_auth_info_t *winGetXcbAuthInfo(void);

#ifndef CYGDEBUG
#define CYGDEBUG NO
#endif

/*
 * Constant defines
 */

#define WIN_CONNECT_RETRIES	5
#define WIN_CONNECT_DELAY	5
#ifdef HAS_DEVWINDOWS
#define WIN_MSG_QUEUE_FNAME	"/dev/windows"
#endif

/*
 * Local structures
 */

typedef struct _WMMsgNodeRec {
    winWMMessageRec msg;
    struct _WMMsgNodeRec *pNext;
} WMMsgNodeRec, *WMMsgNodePtr;

typedef struct _WMMsgQueueRec {
    struct _WMMsgNodeRec *pHead;
    struct _WMMsgNodeRec *pTail;
    pthread_mutex_t pmMutex;
    pthread_cond_t pcNotEmpty;
} WMMsgQueueRec, *WMMsgQueuePtr;

typedef struct _WMInfo {
    xcb_connection_t *conn;
    WMMsgQueueRec wmMsgQueue;
    xcb_atom_t atmWmProtos;
    xcb_atom_t atmWmDelete;
    xcb_atom_t atmWmTakeFocus;
    xcb_atom_t atmPrivMap;
    xcb_atom_t atmUtf8String;
    xcb_atom_t atmNetWmName;
    xcb_ewmh_connection_t ewmh;
} WMInfoRec, *WMInfoPtr;

typedef struct _WMProcArgRec {
    DWORD dwScreen;
    WMInfoPtr pWMInfo;
    pthread_mutex_t *ppmServerStarted;
} WMProcArgRec, *WMProcArgPtr;

typedef struct _XMsgProcArgRec {
    xcb_connection_t *conn;
    DWORD dwScreen;
    WMInfoPtr pWMInfo;
    pthread_mutex_t *ppmServerStarted;
    HWND hwndScreen;
} XMsgProcArgRec, *XMsgProcArgPtr;

/*
 * Prototypes for local functions
 */

static void
 PushMessage(WMMsgQueuePtr pQueue, WMMsgNodePtr pNode);

static WMMsgNodePtr PopMessage(WMMsgQueuePtr pQueue, WMInfoPtr pWMInfo);

static Bool
 InitQueue(WMMsgQueuePtr pQueue);

static void
 GetWindowName(WMInfoPtr pWMInfo, xcb_window_t iWin, char **ppWindowName);

static void
 SendXMessage(xcb_connection_t *conn, xcb_window_t iWin, xcb_atom_t atmType, long nData);

static void
 UpdateName(WMInfoPtr pWMInfo, xcb_window_t iWindow);

static void *winMultiWindowWMProc(void *pArg);

static void *winMultiWindowXMsgProc(void *pArg);

static void
 winInitMultiWindowWM(WMInfoPtr pWMInfo, WMProcArgPtr pProcArg);

#if 0
static void
 PreserveWin32Stack(WMInfoPtr pWMInfo, xcb_window_t iWindow, UINT direction);
#endif

static Bool
CheckAnotherWindowManager(xcb_connection_t *conn, DWORD dwScreen);

static void
 winApplyHints(WMInfoPtr pWMInfo, xcb_window_t iWindow, HWND hWnd, HWND * zstyle);

void
 winUpdateWindowPosition(HWND hWnd, HWND * zstyle);

/*
 * Local globals
 */

static Bool g_shutdown = FALSE;

/*
 * Translate msg id to text, for debug purposes
 */

#if CYGMULTIWINDOW_DEBUG
static const char *
MessageName(winWMMessagePtr msg)
{
  switch (msg->msg)
    {
    case WM_WM_MOVE:
      return "WM_WM_MOVE";
      break;
    case WM_WM_SIZE:
      return "WM_WM_SIZE";
      break;
    case WM_WM_RAISE:
      return "WM_WM_RAISE";
      break;
    case WM_WM_LOWER:
      return "WM_WM_LOWER";
      break;
    case WM_WM_UNMAP:
      return "WM_WM_UNMAP";
      break;
    case WM_WM_KILL:
      return "WM_WM_KILL";
      break;
    case WM_WM_ACTIVATE:
      return "WM_WM_ACTIVATE";
      break;
    case WM_WM_NAME_EVENT:
      return "WM_WM_NAME_EVENT";
      break;
    case WM_WM_ICON_EVENT:
      return "WM_WM_ICON_EVENT";
      break;
    case WM_WM_CHANGE_STATE:
      return "WM_WM_CHANGE_STATE";
      break;
    case WM_WM_MAP2:
      return "WM_WM_MAP2";
      break;
    case WM_WM_MAP3:
      return "WM_WM_MAP3";
      break;
    case WM_WM_HINTS_EVENT:
      return "WM_WM_HINTS_EVENT";
      break;
    default:
      return "Unknown Message";
      break;
    }
}
#endif


/*
 * PushMessage - Push a message onto the queue
 */

static void
PushMessage(WMMsgQueuePtr pQueue, WMMsgNodePtr pNode)
{

    /* Lock the queue mutex */
    pthread_mutex_lock(&pQueue->pmMutex);

    pNode->pNext = NULL;

    if (pQueue->pTail != NULL) {
        pQueue->pTail->pNext = pNode;
    }
    pQueue->pTail = pNode;

    if (pQueue->pHead == NULL) {
        pQueue->pHead = pNode;
    }

    /* Release the queue mutex */
    pthread_mutex_unlock(&pQueue->pmMutex);

    /* Signal that the queue is not empty */
    pthread_cond_signal(&pQueue->pcNotEmpty);
}

/*
 * PopMessage - Pop a message from the queue
 */

static WMMsgNodePtr
PopMessage(WMMsgQueuePtr pQueue, WMInfoPtr pWMInfo)
{
    WMMsgNodePtr pNode;

    /* Lock the queue mutex */
    pthread_mutex_lock(&pQueue->pmMutex);

    /* Wait for --- */
    while (pQueue->pHead == NULL) {
        pthread_cond_wait(&pQueue->pcNotEmpty, &pQueue->pmMutex);
    }

    pNode = pQueue->pHead;
    if (pQueue->pHead != NULL) {
        pQueue->pHead = pQueue->pHead->pNext;
    }

    if (pQueue->pTail == pNode) {
        pQueue->pTail = NULL;
    }

    /* Release the queue mutex */
    pthread_mutex_unlock(&pQueue->pmMutex);

    return pNode;
}

#if 0
/*
 * HaveMessage -
 */

static Bool
HaveMessage(WMMsgQueuePtr pQueue, UINT msg, xcb_window_t iWindow)
{
    WMMsgNodePtr pNode;

    for (pNode = pQueue->pHead; pNode != NULL; pNode = pNode->pNext) {
        if (pNode->msg.msg == msg && pNode->msg.iWindow == iWindow)
            return True;
    }

    return False;
}
#endif

/*
 * InitQueue - Initialize the Window Manager message queue
 */

static
    Bool
InitQueue(WMMsgQueuePtr pQueue)
{
    /* Check if the pQueue pointer is NULL */
    if (pQueue == NULL) {
        ErrorF("InitQueue - pQueue is NULL.  Exiting.\n");
        return FALSE;
    }

    /* Set the head and tail to NULL */
    pQueue->pHead = NULL;
    pQueue->pTail = NULL;

    winDebug("InitQueue - Calling pthread_mutex_init\n");

    /* Create synchronization objects */
    pthread_mutex_init(&pQueue->pmMutex, NULL);

    winDebug("InitQueue - pthread_mutex_init returned\n");
    winDebug("InitQueue - Calling pthread_cond_init\n");

    pthread_cond_init(&pQueue->pcNotEmpty, NULL);

    winDebug("InitQueue - pthread_cond_init returned\n");

    return TRUE;
}

static
char *
Xutf8TextPropertyToString(WMInfoPtr pWMInfo, xcb_icccm_get_text_property_reply_t *xtp)
{
    char *pszReturnData;

    if ((xtp->encoding == XCB_ATOM_STRING) ||        // Latin1 ISO 8859-1
        (xtp->encoding == pWMInfo->atmUtf8String)) { // UTF-8  ISO 10646
        pszReturnData = strndup(xtp->name, xtp->name_len);
    }
    else {
        // Converting from COMPOUND_TEXT to UTF-8 properly is complex to
        // implement, and not very much use unless you have an old
        // application which isn't UTF-8 aware.
        ErrorF("Xutf8TextPropertyToString: text encoding %d is not implemented\n", xtp->encoding);
        pszReturnData = strdup("");
    }

    return pszReturnData;
}

/*
 * GetWindowName - Retrieve the title of an X Window
 */

static void
GetWindowName(WMInfoPtr pWMInfo, xcb_window_t iWin, char **ppWindowName)
{
    xcb_connection_t *conn = pWMInfo->conn;
    char *pszWindowName = NULL;

#if CYGMULTIWINDOW_DEBUG
    ErrorF("GetWindowName\n");
#endif

    /* Try to get window name from _NET_WM_NAME */
    {
        xcb_get_property_cookie_t cookie;
        xcb_get_property_reply_t *reply;

        cookie = xcb_get_property(pWMInfo->conn, FALSE, iWin,
                                  pWMInfo->atmNetWmName,
                                  XCB_GET_PROPERTY_TYPE_ANY, 0, INT_MAX);
        reply = xcb_get_property_reply(pWMInfo->conn, cookie, NULL);
        if (reply && (reply->type != XCB_NONE)) {
            pszWindowName = strndup(xcb_get_property_value(reply),
                                    xcb_get_property_value_length(reply));
            free(reply);
        }
    }

    /* Otherwise, try to get window name from WM_NAME */
    if (!pszWindowName)
        {
            xcb_get_property_cookie_t cookie;
            xcb_icccm_get_text_property_reply_t reply;

            cookie = xcb_icccm_get_wm_name(conn, iWin);
            if (!xcb_icccm_get_wm_name_reply(conn, cookie, &reply, NULL)) {
                ErrorF("GetWindowName - xcb_icccm_get_wm_name_reply failed.  No name.\n");
                *ppWindowName = NULL;
                return;
            }

            pszWindowName = Xutf8TextPropertyToString(pWMInfo, &reply);
            xcb_icccm_get_text_property_reply_wipe(&reply);
        }

    /* return the window name, unless... */
    *ppWindowName = pszWindowName;

    if (g_fHostInTitle) {
        xcb_get_property_cookie_t cookie;
        xcb_icccm_get_text_property_reply_t reply;

        /* Try to get client machine name */
        cookie = xcb_icccm_get_wm_client_machine(conn, iWin);
        if (xcb_icccm_get_wm_client_machine_reply(conn, cookie, &reply, NULL)) {
            char *pszClientMachine;
            char *pszClientHostname;
            char *dot;
            char hostname[HOST_NAME_MAX + 1];

            pszClientMachine = Xutf8TextPropertyToString(pWMInfo, &reply);
            xcb_icccm_get_text_property_reply_wipe(&reply);

            /* If client machine name looks like a FQDN, find the hostname */
            pszClientHostname = strdup(pszClientMachine);
            dot = strchr(pszClientHostname, '.');
            if (dot)
                *dot = '\0';

            /*
               If we have a client machine hostname
               and it's not the local hostname
               and it's not already in the window title...
             */
            if (strlen(pszClientHostname) &&
                !gethostname(hostname, HOST_NAME_MAX + 1) &&
                strcmp(hostname, pszClientHostname) &&
                (strstr(pszWindowName, pszClientHostname) == 0)) {
                /* ... add '@<clientmachine>' to end of window name */
                *ppWindowName =
                    malloc(strlen(pszWindowName) +
                           strlen(pszClientMachine) + 2);
                strcpy(*ppWindowName, pszWindowName);
                strcat(*ppWindowName, "@");
                strcat(*ppWindowName, pszClientMachine);

                free(pszWindowName);
            }

            free(pszClientMachine);
            free(pszClientHostname);
        }
    }
}

/*
 * Does the client support the specified WM_PROTOCOLS protocol?
 */

static Bool
IsWmProtocolAvailable(WMInfoPtr pWMInfo, xcb_window_t iWindow, xcb_atom_t atmProtocol)
{
  int i, found = 0;
  xcb_get_property_cookie_t cookie;
  xcb_icccm_get_wm_protocols_reply_t reply;
  xcb_connection_t *conn = pWMInfo->conn;

  cookie = xcb_icccm_get_wm_protocols(conn, iWindow, pWMInfo->ewmh.WM_PROTOCOLS);
  if (xcb_icccm_get_wm_protocols_reply(conn, cookie, &reply, NULL)) {
    for (i = 0; i < reply.atoms_len; ++i)
      if (reply.atoms[i] == atmProtocol) {
              ++found;
              break;
      }
    xcb_icccm_get_wm_protocols_reply_wipe(&reply);
  }

  return found > 0;
}

/*
 * Send a message to the X server from the WM thread
 */

static void
SendXMessage(xcb_connection_t *conn, xcb_window_t iWin, xcb_atom_t atmType, long nData)
{
    xcb_client_message_event_t e;

    /* Prepare the X event structure */
    memset(&e, 0, sizeof(e));
    e.response_type = XCB_CLIENT_MESSAGE;
    e.window = iWin;
    e.type = atmType;
    e.format = 32;
    e.data.data32[0] = nData;
    e.data.data32[1] = XCB_CURRENT_TIME;

    /* Send the event to X */
    xcb_send_event(conn, FALSE, iWin, XCB_EVENT_MASK_NO_EVENT, (const char *)&e);
}

/*
 * See if we can get the stored HWND for this window...
 */
static HWND
getHwnd(WMInfoPtr pWMInfo, xcb_window_t iWindow)
{
    HWND hWnd = NULL;
    xcb_get_property_cookie_t cookie;
    xcb_get_property_reply_t *reply;

    cookie = xcb_get_property(pWMInfo->conn, FALSE, iWindow, pWMInfo->atmPrivMap,
                              XCB_ATOM_INTEGER, 0L, sizeof(HWND)/4L);
    reply = xcb_get_property_reply(pWMInfo->conn, cookie, NULL);

    if (reply) {
        int length = xcb_get_property_value_length(reply);
        HWND *value = xcb_get_property_value(reply);

        if (value && (length == sizeof(HWND))) {
            hWnd = *value;
        }
        free(reply);
    }

    /* Some sanity checks */
    if (!hWnd)
        return NULL;
    if (!IsWindow(hWnd))
        return NULL;

    return hWnd;
}

/*
 * Helper function to check for override-redirect
 */
static Bool
IsOverrideRedirect(xcb_connection_t *conn, xcb_window_t iWin)
{
    Bool result = FALSE;
    xcb_get_window_attributes_reply_t *reply;
    xcb_get_window_attributes_cookie_t cookie;

    cookie = xcb_get_window_attributes(conn, iWin);
    reply = xcb_get_window_attributes_reply(conn, cookie, NULL);
    if (reply) {
        result = (reply->override_redirect != 0);
        free(reply);
    }
    else {
        ErrorF("IsOverrideRedirect: Failed to get window attributes\n");
    }

    return result;
}

/*
 * Helper function to get class and window names
*/
static void
GetClassNames(WMInfoPtr pWMInfo, xcb_window_t iWindow, char **res_name,
              char **res_class, char **window_name)
{
    xcb_get_property_cookie_t cookie1;
    xcb_icccm_get_wm_class_reply_t reply1;
    xcb_get_property_cookie_t cookie2;
    xcb_icccm_get_text_property_reply_t reply2;

    cookie1 = xcb_icccm_get_wm_class(pWMInfo->conn, iWindow);
    if (xcb_icccm_get_wm_class_reply(pWMInfo->conn, cookie1, &reply1,
                                     NULL)) {
        *res_name = strdup(reply1.instance_name);
        *res_class = strdup(reply1.class_name);
        xcb_icccm_get_wm_class_reply_wipe(&reply1);
    }
    else {
        *res_name = strdup("");
        *res_class = strdup("");
    }

    cookie2 = xcb_icccm_get_wm_name(pWMInfo->conn, iWindow);
    if (xcb_icccm_get_wm_name_reply(pWMInfo->conn, cookie2, &reply2, NULL)) {
        *window_name = strndup(reply2.name, reply2.name_len);
        xcb_icccm_get_text_property_reply_wipe(&reply2);
    }
    else {
        *window_name = strdup("");
    }
}

/*
 * Updates the name of a HWND according to its X WM_NAME property
 */

static void
UpdateName(WMInfoPtr pWMInfo, xcb_window_t iWindow)
{
    HWND hWnd;

    hWnd = getHwnd(pWMInfo, iWindow);
    if (!hWnd)
        return;

    /* If window isn't override-redirect */
    if (!IsOverrideRedirect(pWMInfo->conn, iWindow)) {
        char *pszWindowName;

        /* Get the X windows window name */
        GetWindowName(pWMInfo, iWindow, &pszWindowName);

        if (pszWindowName) {
            /* Convert from UTF-8 to wide char */
            int iLen =
                MultiByteToWideChar(CP_UTF8, 0, pszWindowName, -1, NULL, 0);
            wchar_t *pwszWideWindowName =
                malloc(sizeof(wchar_t)*(iLen + 1));
            MultiByteToWideChar(CP_UTF8, 0, pszWindowName, -1,
                                pwszWideWindowName, iLen);

            /* Set the Windows window name */
            SetWindowTextW(hWnd, pwszWideWindowName);

            free(pwszWideWindowName);
            free(pszWindowName);
        }
    }
}

/*
 * Updates the icon of a HWND according to its X icon properties
 */

static void
UpdateIcon(WMInfoPtr pWMInfo, xcb_window_t iWindow)
{
    HWND hWnd;
    HICON hIconNew = NULL;

    hWnd = getHwnd(pWMInfo, iWindow);
    if (!hWnd)
        return;

    /* If window isn't override-redirect */
    if (!IsOverrideRedirect(pWMInfo->conn, iWindow)) {
        char *window_name = 0;
        char *res_name = 0;
        char *res_class = 0;

        GetClassNames(pWMInfo, iWindow, &res_name, &res_class, &window_name);

        hIconNew = winOverrideIcon(res_name, res_class, window_name);

        free(res_name);
        free(res_class);
        free(window_name);
        winUpdateIcon(hWnd, pWMInfo->conn, iWindow, hIconNew);
    }
}

/*
 * Updates the style of a HWND according to its X style properties
 */

static void
UpdateStyle(WMInfoPtr pWMInfo, xcb_window_t iWindow)
{
    HWND hWnd;
    HWND zstyle = HWND_NOTOPMOST;
    UINT flags;

    hWnd = getHwnd(pWMInfo, iWindow);
    if (!hWnd)
        return;

    /* Determine the Window style, which determines borders and clipping region... */
    winApplyHints(pWMInfo, iWindow, hWnd, &zstyle);
    winUpdateWindowPosition(hWnd, &zstyle);

    /* Apply the updated window style, without changing it's show or activation state */
    flags = SWP_FRAMECHANGED | SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE;
    if (zstyle == HWND_NOTOPMOST)
        flags |= SWP_NOZORDER | SWP_NOOWNERZORDER;
    SetWindowPos(hWnd, NULL, 0, 0, 0, 0, flags);

    /*
       Use the WS_EX_TOOLWINDOW style to remove window from Alt-Tab window switcher

       According to MSDN, this is supposed to remove the window from the taskbar as well,
       if we SW_HIDE before changing the style followed by SW_SHOW afterwards.

       But that doesn't seem to work reliably, and causes the window to flicker, so use
       the iTaskbarList interface to tell the taskbar to show or hide this window.
     */
    winShowWindowOnTaskbar(hWnd,
                           (GetWindowLongPtr(hWnd, GWL_EXSTYLE) &
                            WS_EX_APPWINDOW) ? TRUE : FALSE);
}

/*
 * Updates the state of a HWND
 * (only minimization supported at the moment)
 */

static void
UpdateState(WMInfoPtr pWMInfo, xcb_window_t iWindow)
{
    HWND hWnd;

    winDebug("UpdateState: iWindow 0x%08x\n", (int)iWindow);

    hWnd = getHwnd(pWMInfo, iWindow);
    if (!hWnd)
        return;

    ShowWindow(hWnd, SW_MINIMIZE);
}

#if 0
/*
 * Fix up any differences between the X11 and Win32 window stacks
 * starting at the window passed in
 */
static void
PreserveWin32Stack(WMInfoPtr pWMInfo, xcb_window_t iWindow, UINT direction)
{
    HWND hWnd;
    DWORD myWinProcID, winProcID;
    xcb_window_t xWindow;
    WINDOWPLACEMENT wndPlace;

    hWnd = getHwnd(pWMInfo, iWindow);
    if (!hWnd)
        return;

    GetWindowThreadProcessId(hWnd, &myWinProcID);
    hWnd = GetNextWindow(hWnd, direction);

    while (hWnd) {
        GetWindowThreadProcessId(hWnd, &winProcID);
        if (winProcID == myWinProcID) {
            wndPlace.length = sizeof(WINDOWPLACEMENT);
            GetWindowPlacement(hWnd, &wndPlace);
            if (!(wndPlace.showCmd == SW_HIDE ||
                  wndPlace.showCmd == SW_MINIMIZE)) {
                xWindow = (Window) GetProp(hWnd, WIN_WID_PROP);
                if (xWindow) {
                    if (direction == GW_HWNDPREV)
                        XRaiseWindow(pWMInfo->pDisplay, xWindow);
                    else
                        XLowerWindow(pWMInfo->pDisplay, xWindow);
                }
            }
        }
        hWnd = GetNextWindow(hWnd, direction);
    }
}
#endif                          /* PreserveWin32Stack */

/*
 * winMultiWindowWMProc
 */

static void *
winMultiWindowWMProc(void *pArg)
{
    WMProcArgPtr pProcArg = (WMProcArgPtr) pArg;
    WMInfoPtr pWMInfo = pProcArg->pWMInfo;

    /* Initialize the Window Manager */
    winInitMultiWindowWM(pWMInfo, pProcArg);

#if CYGMULTIWINDOW_DEBUG
    ErrorF("winMultiWindowWMProc ()\n");
#endif

    /* Loop until we explicitly break out */
    for (;;) {
        WMMsgNodePtr pNode;

        /* Pop a message off of our queue */
        pNode = PopMessage(&pWMInfo->wmMsgQueue, pWMInfo);
        if (pNode == NULL) {
            /* Bail if PopMessage returns without a message */
            /* NOTE: Remember that PopMessage is a blocking function. */
            ErrorF("winMultiWindowWMProc - Queue is Empty?  Exiting.\n");
            pthread_exit(NULL);
        }

#if CYGMULTIWINDOW_DEBUG
        ErrorF("winMultiWindowWMProc - MSG: %s (%d) ID: %d\n",
               MessageName(&(pNode->msg)), (int)pNode->msg.msg, (int)pNode->msg.dwID);
#endif

        /* Branch on the message type */
        switch (pNode->msg.msg) {
#if 0
        case WM_WM_MOVE:
            break;

        case WM_WM_SIZE:
            break;
#endif

        case WM_WM_RAISE:
            /* Raise the window */
            {
                const static uint32_t values[] = { XCB_STACK_MODE_ABOVE };
                xcb_configure_window(pWMInfo->conn, pNode->msg.iWindow,
                                     XCB_CONFIG_WINDOW_STACK_MODE, values);
            }

#if 0
            PreserveWin32Stack(pWMInfo, pNode->msg.iWindow, GW_HWNDPREV);
#endif
            break;

        case WM_WM_LOWER:
            /* Lower the window */
            {
                const static uint32_t values[] = { XCB_STACK_MODE_BELOW };
                xcb_configure_window(pWMInfo->conn, pNode->msg.iWindow,
                                     XCB_CONFIG_WINDOW_STACK_MODE, values);
            }
            break;

        case WM_WM_MAP2:
            /* Put a note as to the HWND associated with this Window */
            xcb_change_property(pWMInfo->conn, XCB_PROP_MODE_REPLACE,
                                pNode->msg.iWindow, pWMInfo->atmPrivMap,
                                XCB_ATOM_INTEGER, 32,
                                sizeof(HWND)/4, &(pNode->msg.hwndWindow));

            break;

        case WM_WM_MAP3:
            /* Put a note as to the HWND associated with this Window */
            xcb_change_property(pWMInfo->conn, XCB_PROP_MODE_REPLACE,
                                pNode->msg.iWindow, pWMInfo->atmPrivMap,
                                XCB_ATOM_INTEGER, 32,
                                sizeof(HWND)/4, &(pNode->msg.hwndWindow));

            UpdateName(pWMInfo, pNode->msg.iWindow);
            UpdateIcon(pWMInfo, pNode->msg.iWindow);
            UpdateStyle(pWMInfo, pNode->msg.iWindow);


            /* Reshape */
            {
                WindowPtr pWin =
                    GetProp(pNode->msg.hwndWindow, WIN_WINDOW_PROP);
                if (pWin) {
                    winReshapeMultiWindow(pWin);
                    winUpdateRgnMultiWindow(pWin);
                }
            }

            break;

        case WM_WM_UNMAP:

            /* Unmap the window */
            xcb_unmap_window(pWMInfo->conn, pNode->msg.iWindow);
            break;

        case WM_WM_KILL:
            {
                /* --- */
                if (IsWmProtocolAvailable(pWMInfo,
                                          pNode->msg.iWindow,
                                          pWMInfo->atmWmDelete))
                    SendXMessage(pWMInfo->conn,
                                 pNode->msg.iWindow,
                                 pWMInfo->atmWmProtos, pWMInfo->atmWmDelete);
                else
                    xcb_kill_client(pWMInfo->conn, pNode->msg.iWindow);
            }
            break;

        case WM_WM_ACTIVATE:
            /* Set the input focus */

            /*
               ICCCM 4.1.7 is pretty opaque, but it appears that the rules are
               actually quite simple:
               -- the WM_HINTS input field determines whether the WM should call
               XSetInputFocus()
               -- independently, the WM_TAKE_FOCUS protocol determines whether
               the WM should send a WM_TAKE_FOCUS ClientMessage.
            */
            {
              Bool neverFocus = FALSE;
              xcb_get_property_cookie_t cookie;
              xcb_icccm_wm_hints_t hints;

              cookie = xcb_icccm_get_wm_hints(pWMInfo->conn, pNode->msg.iWindow);
              if (xcb_icccm_get_wm_hints_reply(pWMInfo->conn, cookie, &hints,
                                               NULL)) {
                if (hints.flags & XCB_ICCCM_WM_HINT_INPUT)
                  neverFocus = !hints.input;
              }

              if (!neverFocus)
                xcb_set_input_focus(pWMInfo->conn, XCB_INPUT_FOCUS_POINTER_ROOT,
                                    pNode->msg.iWindow, XCB_CURRENT_TIME);

              if (IsWmProtocolAvailable(pWMInfo,
                                        pNode->msg.iWindow,
                                        pWMInfo->atmWmTakeFocus))
                SendXMessage(pWMInfo->conn,
                             pNode->msg.iWindow,
                             pWMInfo->atmWmProtos, pWMInfo->atmWmTakeFocus);

            }
            break;

        case WM_WM_NAME_EVENT:
            UpdateName(pWMInfo, pNode->msg.iWindow);
            break;

        case WM_WM_ICON_EVENT:
            UpdateIcon(pWMInfo, pNode->msg.iWindow);
            break;

        case WM_WM_HINTS_EVENT:
            {
            /* Don't do anything if this is an override-redirect window */
            if (IsOverrideRedirect(pWMInfo->conn, pNode->msg.iWindow))
              break;

            UpdateStyle(pWMInfo, pNode->msg.iWindow);
            }
            break;

        case WM_WM_CHANGE_STATE:
            UpdateState(pWMInfo, pNode->msg.iWindow);
            break;

        default:
            ErrorF("winMultiWindowWMProc - Unknown Message.  Exiting.\n");
            pthread_exit(NULL);
            break;
        }

        /* Free the retrieved message */
        free(pNode);

        /* Flush any pending events on our display */
        xcb_flush(pWMInfo->conn);

        /* This is just laziness rather than making sure we used _checked everywhere */
        {
            xcb_generic_event_t *event = xcb_poll_for_event(pWMInfo->conn);
            if (event) {
                if ((event->response_type & ~0x80) == 0) {
                    xcb_generic_error_t *err = (xcb_generic_error_t *)event;
                    ErrorF("winMultiWindowWMProc - Error code: %i, ID: 0x%08x, "
                           "Major opcode: %i, Minor opcode: %i\n",
                           err->error_code, err->resource_id,
                           err->major_code, err->minor_code);
                }
            }
        }

        /* I/O errors etc. */
        {
            int e = xcb_connection_has_error(pWMInfo->conn);
            if (e) {
                ErrorF("winMultiWindowWMProc - Fatal error %d on xcb connection\n", e);
                break;
            }
        }
    }

    /* Free the condition variable */
    pthread_cond_destroy(&pWMInfo->wmMsgQueue.pcNotEmpty);

    /* Free the mutex variable */
    pthread_mutex_destroy(&pWMInfo->wmMsgQueue.pmMutex);

    /* Free the passed-in argument */
    free(pProcArg);

#if CYGMULTIWINDOW_DEBUG
    ErrorF("-winMultiWindowWMProc ()\n");
#endif
    return NULL;
}

static xcb_atom_t
intern_atom(xcb_connection_t *conn, const char *atomName)
{
  xcb_intern_atom_reply_t *atom_reply;
  xcb_intern_atom_cookie_t atom_cookie;
  xcb_atom_t atom = XCB_ATOM_NONE;

  atom_cookie = xcb_intern_atom(conn, 0, strlen(atomName), atomName);
  atom_reply = xcb_intern_atom_reply(conn, atom_cookie, NULL);
  if (atom_reply) {
    atom = atom_reply->atom;
    free(atom_reply);
  }
  return atom;
}

/*
 * X message procedure
 */

static void *
winMultiWindowXMsgProc(void *pArg)
{
    winWMMessageRec msg;
    XMsgProcArgPtr pProcArg = (XMsgProcArgPtr) pArg;
    char pszDisplay[512];
    int iRetries;
    xcb_atom_t atmWmName;
    xcb_atom_t atmNetWmName;
    xcb_atom_t atmWmHints;
    xcb_atom_t atmWmChange;
    xcb_atom_t atmNetWmIcon;
    xcb_atom_t atmWindowState, atmMotifWmHints, atmWindowType, atmNormalHints;
    int iReturn;
    xcb_auth_info_t *auth_info;

    winDebug("winMultiWindowXMsgProc - Hello\n");

    /* Check that argument pointer is not invalid */
    if (pProcArg == NULL) {
        ErrorF("winMultiWindowXMsgProc - pProcArg is NULL.  Exiting.\n");
        pthread_exit(NULL);
    }

    winDebug("winMultiWindowXMsgProc - Calling pthread_mutex_lock ()\n");

    /* Grab the server started mutex - pause until we get it */
    iReturn = pthread_mutex_lock(pProcArg->ppmServerStarted);
    if (iReturn != 0) {
        ErrorF("winMultiWindowXMsgProc - pthread_mutex_lock () failed: %d.  "
               "Exiting.\n", iReturn);
        pthread_exit(NULL);
    }

    winDebug("winMultiWindowXMsgProc - pthread_mutex_lock () returned.\n");

    /* Release the server started mutex */
    pthread_mutex_unlock(pProcArg->ppmServerStarted);

    winDebug("winMultiWindowXMsgProc - pthread_mutex_unlock () returned.\n");

    /* Setup the display connection string x */
    winGetDisplayName(pszDisplay, (int) pProcArg->dwScreen);

    /* Print the display connection string */
    ErrorF("winMultiWindowXMsgProc - DISPLAY=%s\n", pszDisplay);

    /* Use our generated cookie for authentication */
    auth_info = winGetXcbAuthInfo();

    /* Initialize retry count */
    iRetries = 0;

    /* Open the X display */
    do {
        /* Try to open the display */
        pProcArg->conn = xcb_connect_to_display_with_auth_info(pszDisplay,
                                                               auth_info, NULL);
        if (xcb_connection_has_error(pProcArg->conn)) {
            ErrorF("winMultiWindowXMsgProc - Could not open display, try: %d, "
                   "sleeping: %d\n", iRetries + 1, WIN_CONNECT_DELAY);
            ++iRetries;
            sleep(WIN_CONNECT_DELAY);
            continue;
        }
        else
            break;
    }
    while (xcb_connection_has_error(pProcArg->conn) && iRetries < WIN_CONNECT_RETRIES);

    /* Make sure that the display opened */
    if (xcb_connection_has_error(pProcArg->conn)) {
        ErrorF("winMultiWindowXMsgProc - Failed opening the display.  "
               "Exiting.\n");
        pthread_exit(NULL);
    }

    ErrorF("winMultiWindowXMsgProc - xcb_connect() returned and "
           "successfully opened the display.\n");

    /* Check if another window manager is already running */
    if (CheckAnotherWindowManager(pProcArg->conn, pProcArg->dwScreen)) {
        ErrorF("winMultiWindowXMsgProc - "
               "another window manager is running.  Exiting.\n");
        pthread_exit(NULL);
    }

    {
        /* Get root window id */
        xcb_screen_t *root_screen = xcb_aux_get_screen(pProcArg->conn, pProcArg->dwScreen);
        xcb_window_t root_window_id = root_screen->root;

        /* Set WM_ICON_SIZE property indicating desired icon sizes */
        typedef struct {
            uint32_t min_width, min_height;
            uint32_t max_width, max_height;
            int32_t width_inc, height_inc;
        } xcb_wm_icon_size_hints_hints_t;

        xcb_wm_icon_size_hints_hints_t xis;
        xis.min_width = xis.min_height = 16;
        xis.max_width = xis.max_height = 48;
        xis.width_inc = xis.height_inc = 16;

        xcb_change_property(pProcArg->conn, XCB_PROP_MODE_REPLACE, root_window_id,
                            XCB_ATOM_WM_ICON_SIZE, XCB_ATOM_WM_ICON_SIZE, 32,
                            sizeof(xis)/4, &xis);
    }

    atmWmName = intern_atom(pProcArg->conn, "WM_NAME");
    atmNetWmName = intern_atom(pProcArg->conn, "_NET_WM_NAME");
    atmWmHints = intern_atom(pProcArg->conn, "WM_HINTS");
    atmWmChange = intern_atom(pProcArg->conn, "WM_CHANGE_STATE");
    atmNetWmIcon = intern_atom(pProcArg->conn, "_NET_WM_ICON");
    atmWindowState = intern_atom(pProcArg->conn, "_NET_WM_STATE");
    atmMotifWmHints = intern_atom(pProcArg->conn, "_MOTIF_WM_HINTS");
    atmWindowType = intern_atom(pProcArg->conn, "_NET_WM_WINDOW_TYPE");
    atmNormalHints = intern_atom(pProcArg->conn, "WM_NORMAL_HINTS");

    /*
       iiimxcf had a bug until 2009-04-27, assuming that the
       WM_STATE atom exists, causing clients to fail with
       a BadAtom X error if it doesn't.

       Since this is on in the default Solaris 10 install,
       workaround this by making sure it does exist...
     */
    intern_atom(pProcArg->conn, "WM_STATE");

    /* Loop until we explicitly break out */
    while (1) {
        xcb_generic_event_t *event;
        uint8_t type;
        Bool send_event;

        if (g_shutdown)
            break;

        /* Fetch next event */
        event = xcb_wait_for_event(pProcArg->conn);
        if (!event) { // returns NULL on I/O error
            int e = xcb_connection_has_error(pProcArg->conn);
            ErrorF("winMultiWindowXMsgProc - Fatal error %d on xcb connection\n", e);
            break;
        }

        type = event->response_type & ~0x80;
        send_event = event->response_type & 0x80;

        winDebug("winMultiWindowXMsgProc - event %d\n", type);

        /* Branch on event type */
        if (type == 0) {
            xcb_generic_error_t *err = (xcb_generic_error_t *)event;
            ErrorF("winMultiWindowXMsgProc - Error code: %i, ID: 0x%08x, "
                   "Major opcode: %i, Minor opcode: %i\n",
                   err->error_code, err->resource_id,
                   err->major_code, err->minor_code);
            }
        else if (type == XCB_CREATE_NOTIFY) {
            xcb_create_notify_event_t *notify = (xcb_create_notify_event_t *)event;

            /* Request property change events */
            const static uint32_t mask_value[] = { XCB_EVENT_MASK_PROPERTY_CHANGE };
            xcb_change_window_attributes (pProcArg->conn, notify->window,
                                          XCB_CW_EVENT_MASK, mask_value);

            /* If it's not override-redirect, set the border-width to 0 */
            if (!IsOverrideRedirect(pProcArg->conn, notify->window)) {
                const static uint32_t width_value[] = { 0 };
                xcb_configure_window(pProcArg->conn, notify->window,
                                     XCB_CONFIG_WINDOW_BORDER_WIDTH, width_value);
            }
        }
        else if (type == XCB_MAP_NOTIFY) {
            /* Fake a reparentNotify event as SWT/Motif expects a
               Window Manager to reparent a top-level window when
               it is mapped and waits until they do.

               We don't actually need to reparent, as the frame is
               a native window, not an X window

               We do this on MapNotify, not MapRequest like a real
               Window Manager would, so we don't have do get involved
               in actually mapping the window via it's (non-existent)
               parent...

               See sourceware bugzilla #9848
             */

            xcb_map_notify_event_t *notify = (xcb_map_notify_event_t *)event;

            xcb_get_geometry_cookie_t cookie;
            xcb_get_geometry_reply_t *reply;
            xcb_query_tree_cookie_t cookie_qt;
            xcb_query_tree_reply_t *reply_qt;

            cookie = xcb_get_geometry(pProcArg->conn, notify->window);
            cookie_qt = xcb_query_tree(pProcArg->conn, notify->window);
            reply = xcb_get_geometry_reply(pProcArg->conn, cookie, NULL);
            reply_qt = xcb_query_tree_reply(pProcArg->conn, cookie_qt, NULL);

            if (reply && reply_qt) {
                /*
                   It's a top-level window if the parent window is a root window
                   Only non-override_redirect windows can get reparented
                 */
                if ((reply->root == reply_qt->parent) && !notify->override_redirect) {
                    xcb_reparent_notify_event_t event_send;

                    event_send.response_type = ReparentNotify;
                    event_send.event = notify->window;
                    event_send.window = notify->window;
                    event_send.parent = reply_qt->parent;
                    event_send.x = reply->x;
                    event_send.y = reply->y;

                    xcb_send_event (pProcArg->conn, TRUE, notify->window,
                                    XCB_EVENT_MASK_STRUCTURE_NOTIFY,
                                    (const char *)&event_send);

                    free(reply_qt);
                    free(reply);
                }
            }
        }
        else if (type == XCB_CONFIGURE_NOTIFY) {
            if (!send_event) {
                /*
                   Java applications using AWT on JRE 1.6.0 break with non-reparenting WMs AWT
                   doesn't explicitly know about (See sun bug #6434227)

                   XDecoratedPeer.handleConfigureNotifyEvent() only processes non-synthetic
                   ConfigureNotify events to update window location if it's identified the
                   WM as a non-reparenting WM it knows about (compiz or lookingglass)

                   Rather than tell all sorts of lies to get XWM to recognize us as one of
                   those, simply send a synthetic ConfigureNotify for every non-synthetic one
                 */
                xcb_configure_notify_event_t *notify = (xcb_configure_notify_event_t *)event;
                xcb_configure_notify_event_t event_send = *notify;

                event_send.event = notify->window;

                xcb_send_event(pProcArg->conn, TRUE, notify->window,
                               XCB_EVENT_MASK_STRUCTURE_NOTIFY,
                               (const char *)&event_send);
            }
        }
        else if (type ==  XCB_PROPERTY_NOTIFY) {
            xcb_property_notify_event_t *notify = (xcb_property_notify_event_t *)event;

            if ((notify->atom == atmWmName) ||
                (notify->atom == atmNetWmName)) {
                memset(&msg, 0, sizeof(msg));

                msg.msg = WM_WM_NAME_EVENT;
                msg.iWindow = notify->window;

                /* Other fields ignored */
                winSendMessageToWM(pProcArg->pWMInfo, &msg);
            }
            else {
                /*
                   Several properties are considered for WM hints, check if this property change affects any of them...
                   (this list needs to be kept in sync with winApplyHints())
                 */
                if ((notify->atom == atmWmHints) ||
                    (notify->atom == atmWindowState) ||
                    (notify->atom == atmMotifWmHints) ||
                    (notify->atom == atmWindowType) ||
                    (notify->atom == atmNormalHints)) {
                    memset(&msg, 0, sizeof(msg));
                    msg.msg = WM_WM_HINTS_EVENT;
                    msg.iWindow = notify->window;

                    /* Other fields ignored */
                    winSendMessageToWM(pProcArg->pWMInfo, &msg);
                }

                /* Not an else as WM_HINTS affects both style and icon */
                if ((notify->atom == atmWmHints) ||
                    (notify->atom == atmNetWmIcon)) {
                    memset(&msg, 0, sizeof(msg));
                    msg.msg = WM_WM_ICON_EVENT;
                    msg.iWindow = notify->window;

                    /* Other fields ignored */
                    winSendMessageToWM(pProcArg->pWMInfo, &msg);
                }
            }
        }
        else if (type == XCB_CLIENT_MESSAGE) {
            xcb_client_message_event_t *client_msg = (xcb_client_message_event_t *)event;

            if (client_msg->type == atmWmChange
                 && client_msg->data.data32[0] == XCB_ICCCM_WM_STATE_ICONIC) {
                ErrorF("winMultiWindowXMsgProc - WM_CHANGE_STATE - IconicState\n");

                memset(&msg, 0, sizeof(msg));

                msg.msg = WM_WM_CHANGE_STATE;
                msg.iWindow = client_msg->window;

                winSendMessageToWM(pProcArg->pWMInfo, &msg);
            }
        }

        /* Free the event */
        free(event);
    }

    xcb_disconnect(pProcArg->conn);
    pthread_exit(NULL);
    return NULL;
}

/*
 * winInitWM - Entry point for the X server to spawn
 * the Window Manager thread.  Called from
 * winscrinit.c/winFinishScreenInitFB ().
 */

Bool
winInitWM(void **ppWMInfo,
          pthread_t * ptWMProc,
          pthread_t * ptXMsgProc,
          pthread_mutex_t * ppmServerStarted,
          int dwScreen, HWND hwndScreen)
{
    WMProcArgPtr pArg = malloc(sizeof(WMProcArgRec));
    WMInfoPtr pWMInfo = malloc(sizeof(WMInfoRec));
    XMsgProcArgPtr pXMsgArg = malloc(sizeof(XMsgProcArgRec));

    /* Bail if the input parameters are bad */
    if (pArg == NULL || pWMInfo == NULL || pXMsgArg == NULL) {
        ErrorF("winInitWM - malloc failed.\n");
        free(pArg);
        free(pWMInfo);
        free(pXMsgArg);
        return FALSE;
    }

    /* Zero the allocated memory */
    ZeroMemory(pArg, sizeof(WMProcArgRec));
    ZeroMemory(pWMInfo, sizeof(WMInfoRec));
    ZeroMemory(pXMsgArg, sizeof(XMsgProcArgRec));

    /* Set a return pointer to the Window Manager info structure */
    *ppWMInfo = pWMInfo;

    /* Setup the argument structure for the thread function */
    pArg->dwScreen = dwScreen;
    pArg->pWMInfo = pWMInfo;
    pArg->ppmServerStarted = ppmServerStarted;

    /* Intialize the message queue */
    if (!InitQueue(&pWMInfo->wmMsgQueue)) {
        ErrorF("winInitWM - InitQueue () failed.\n");
        return FALSE;
    }

    /* Spawn a thread for the Window Manager */
    if (pthread_create(ptWMProc, NULL, winMultiWindowWMProc, pArg)) {
        /* Bail if thread creation failed */
        ErrorF("winInitWM - pthread_create failed for Window Manager.\n");
        return FALSE;
    }

    /* Spawn the XNextEvent thread, will send messages to WM */
    pXMsgArg->dwScreen = dwScreen;
    pXMsgArg->pWMInfo = pWMInfo;
    pXMsgArg->ppmServerStarted = ppmServerStarted;
    pXMsgArg->hwndScreen = hwndScreen;
    if (pthread_create(ptXMsgProc, NULL, winMultiWindowXMsgProc, pXMsgArg)) {
        /* Bail if thread creation failed */
        ErrorF("winInitWM - pthread_create failed on XMSG.\n");
        return FALSE;
    }

#if CYGDEBUG || YES
    winDebug("winInitWM - Returning.\n");
#endif

    return TRUE;
}

/*
 * Window manager thread - setup
 */

static void
winInitMultiWindowWM(WMInfoPtr pWMInfo, WMProcArgPtr pProcArg)
{
    int iRetries = 0;
    char pszDisplay[512];
    int iReturn;
    xcb_auth_info_t *auth_info;

    winDebug("winInitMultiWindowWM - Hello\n");

    /* Check that argument pointer is not invalid */
    if (pProcArg == NULL) {
        ErrorF("winInitMultiWindowWM - pProcArg is NULL.  Exiting.\n");
        pthread_exit(NULL);
    }

    winDebug("winInitMultiWindowWM - Calling pthread_mutex_lock ()\n");

    /* Grab our garbage mutex to satisfy pthread_cond_wait */
    iReturn = pthread_mutex_lock(pProcArg->ppmServerStarted);
    if (iReturn != 0) {
        ErrorF("winInitMultiWindowWM - pthread_mutex_lock () failed: %d.  "
               "Exiting.\n", iReturn);
        pthread_exit(NULL);
    }

    winDebug("winInitMultiWindowWM - pthread_mutex_lock () returned.\n");

    /* Release the server started mutex */
    pthread_mutex_unlock(pProcArg->ppmServerStarted);

    winDebug("winInitMultiWindowWM - pthread_mutex_unlock () returned.\n");

    /* Setup the display connection string x */
    winGetDisplayName(pszDisplay, (int) pProcArg->dwScreen);

    /* Print the display connection string */
    ErrorF("winInitMultiWindowWM - DISPLAY=%s\n", pszDisplay);

    /* Use our generated cookie for authentication */
    auth_info = winGetXcbAuthInfo();

    /* Open the X display */
    do {
        /* Try to open the display */
        pWMInfo->conn = xcb_connect_to_display_with_auth_info(pszDisplay,
                                                              auth_info, NULL);
        if (xcb_connection_has_error(pWMInfo->conn)) {
            ErrorF("winInitMultiWindowWM - Could not open display, try: %d, "
                   "sleeping: %d\n", iRetries + 1, WIN_CONNECT_DELAY);
            ++iRetries;
            sleep(WIN_CONNECT_DELAY);
            continue;
        }
        else
            break;
    }
    while (xcb_connection_has_error(pWMInfo->conn) && iRetries < WIN_CONNECT_RETRIES);

    /* Make sure that the display opened */
    if (xcb_connection_has_error(pWMInfo->conn)) {
        ErrorF("winInitMultiWindowWM - Failed opening the display.  "
               "Exiting.\n");
        pthread_exit(NULL);
    }

    ErrorF("winInitMultiWindowWM - xcb_connect () returned and "
           "successfully opened the display.\n");

    /* Create some atoms */
    pWMInfo->atmWmProtos = intern_atom(pWMInfo->conn, "WM_PROTOCOLS");
    pWMInfo->atmWmDelete = intern_atom(pWMInfo->conn, "WM_DELETE_WINDOW");
    pWMInfo->atmWmTakeFocus = intern_atom(pWMInfo->conn, "WM_TAKE_FOCUS");
    pWMInfo->atmPrivMap = intern_atom(pWMInfo->conn, WINDOWSWM_NATIVE_HWND);
    pWMInfo->atmUtf8String = intern_atom(pWMInfo->conn, "UTF8_STRING");
    pWMInfo->atmNetWmName = intern_atom(pWMInfo->conn, "_NET_WM_NAME");

    /* Initialization for the xcb_ewmh and EWMH atoms */
    {
        xcb_intern_atom_cookie_t *atoms_cookie;
        atoms_cookie = xcb_ewmh_init_atoms(pWMInfo->conn, &pWMInfo->ewmh);
        if (xcb_ewmh_init_atoms_replies(&pWMInfo->ewmh, atoms_cookie, NULL)) {
            /* Set the _NET_SUPPORTED atom for this context.

               TODO: Audit to ensure we implement everything defined as MUSTs
               for window managers in the EWMH standard.*/
            xcb_atom_t supported[] =
                {
                    pWMInfo->ewmh.WM_PROTOCOLS,
                    pWMInfo->ewmh._NET_SUPPORTED,
                    pWMInfo->ewmh._NET_SUPPORTING_WM_CHECK,
                    pWMInfo->ewmh._NET_CLOSE_WINDOW,
                    pWMInfo->ewmh._NET_WM_WINDOW_TYPE,
                    pWMInfo->ewmh._NET_WM_WINDOW_TYPE_DOCK,
                    pWMInfo->ewmh._NET_WM_WINDOW_TYPE_SPLASH,
                    pWMInfo->ewmh._NET_WM_STATE,
                    pWMInfo->ewmh._NET_WM_STATE_HIDDEN,
                    pWMInfo->ewmh._NET_WM_STATE_ABOVE,
                    pWMInfo->ewmh._NET_WM_STATE_BELOW,
                    pWMInfo->ewmh._NET_WM_STATE_SKIP_TASKBAR,
                };

            xcb_ewmh_set_supported(&pWMInfo->ewmh, pProcArg->dwScreen,
                                   ARRAY_SIZE(supported), supported);
        }
        else {
            ErrorF("winInitMultiWindowWM - xcb_ewmh_init_atoms() failed\n");
        }
    }

    /*
      Set the root window cursor to left_ptr (this controls the cursor an
      application gets over it's windows when it doesn't set one)
    */
    {
#define XC_left_ptr 68
        xcb_cursor_t cursor = xcb_generate_id(pWMInfo->conn);
        xcb_font_t font = xcb_generate_id(pWMInfo->conn);
        xcb_font_t *mask_font = &font; /* An alias to clarify */
        int shape = XC_left_ptr;
        uint32_t mask = XCB_CW_CURSOR;
        uint32_t value_list = cursor;

        xcb_screen_t *root_screen = xcb_aux_get_screen(pWMInfo->conn, pProcArg->dwScreen);
        xcb_window_t window = root_screen->root;

        static const uint16_t fgred = 0, fggreen = 0, fgblue = 0;
        static const uint16_t bgred = 0xFFFF, bggreen = 0xFFFF, bgblue = 0xFFFF;

        xcb_open_font(pWMInfo->conn, font, sizeof("cursor"), "cursor");

        xcb_create_glyph_cursor(pWMInfo->conn, cursor, font, *mask_font,
                                shape, shape + 1,
                                fgred, fggreen, fgblue, bgred, bggreen, bgblue);

        xcb_change_window_attributes(pWMInfo->conn, window, mask, &value_list);

        xcb_free_cursor(pWMInfo->conn, cursor);
        xcb_close_font(pWMInfo->conn, font);
    }
}

/*
 * winSendMessageToWM - Send a message from the X thread to the WM thread
 */

void
winSendMessageToWM(void *pWMInfo, winWMMessagePtr pMsg)
{
    WMMsgNodePtr pNode;

#if CYGMULTIWINDOW_DEBUG
    ErrorF("winSendMessageToWM %s\n", MessageName(pMsg));
#endif

    pNode = malloc(sizeof(WMMsgNodeRec));
    if (pNode != NULL) {
        memcpy(&pNode->msg, pMsg, sizeof(winWMMessageRec));
        PushMessage(&((WMInfoPtr) pWMInfo)->wmMsgQueue, pNode);
    }
}

/*
 * Check if another window manager is running
 */

static Bool
CheckAnotherWindowManager(xcb_connection_t *conn, DWORD dwScreen)
{
    Bool redirectError = FALSE;

    /* Get root window id */
    xcb_screen_t *root_screen = xcb_aux_get_screen(conn, dwScreen);
    xcb_window_t root_window_id = root_screen->root;

    /*
       Try to select the events which only one client at a time is allowed to select.
       If this causes an error, another window manager is already running...
     */
    const static uint32_t test_mask[] = { XCB_EVENT_MASK_RESIZE_REDIRECT |
                                       XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT |
                                       XCB_EVENT_MASK_BUTTON_PRESS };

    xcb_void_cookie_t cookie = xcb_change_window_attributes_checked(conn,
                                                                    root_window_id,
                                                                    XCB_CW_EVENT_MASK,
                                                                    test_mask);
    xcb_generic_error_t *error;
    if ((error = xcb_request_check(conn, cookie)))
        {
            redirectError = TRUE;
            free(error);
        }

    /*
       Side effect: select the events we are actually interested in...

       Other WMs are not allowed, also select one of the events which only one client
       at a time is allowed to select, so other window managers won't start...
     */
    {
        const uint32_t mask[] = { XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY |
                                  XCB_EVENT_MASK_BUTTON_PRESS };

        xcb_change_window_attributes(conn, root_window_id, XCB_CW_EVENT_MASK, mask);
    }

    return redirectError;
}

/*
 * Notify the MWM thread we're exiting and not to reconnect
 */

void
winDeinitMultiWindowWM(void)
{
    ErrorF("winDeinitMultiWindowWM - Noting shutdown in progress\n");
    g_shutdown = TRUE;
}

/* Windows window styles */
#define HINT_NOFRAME	(1L<<0)
#define HINT_BORDER	(1L<<1)
#define HINT_SIZEBOX	(1L<<2)
#define HINT_CAPTION	(1L<<3)
#define HINT_NOMAXIMIZE (1L<<4)
#define HINT_NOMINIMIZE (1L<<5)
#define HINT_NOSYSMENU  (1L<<6)
#define HINT_SKIPTASKBAR (1L<<7)
/* These two are used on their own */
#define HINT_MAX	(1L<<0)
#define HINT_MIN	(1L<<1)

static void
winApplyHints(WMInfoPtr pWMInfo, xcb_window_t iWindow, HWND hWnd, HWND * zstyle)
{

    xcb_connection_t *conn = pWMInfo->conn;
    static xcb_atom_t windowState, motif_wm_hints;
    static xcb_atom_t hiddenState, fullscreenState, belowState, aboveState,
        skiptaskbarState;
    static xcb_atom_t splashType;
    static int generation;

    unsigned long hint = 0, maxmin = 0;
    unsigned long style, exStyle;

    if (!hWnd)
        return;
    if (!IsWindow(hWnd))
        return;

    if (generation != serverGeneration) {
        generation = serverGeneration;
        windowState = intern_atom(conn, "_NET_WM_STATE");
        motif_wm_hints = intern_atom(conn, "_MOTIF_WM_HINTS");
        hiddenState = intern_atom(conn, "_NET_WM_STATE_HIDDEN");
        fullscreenState = intern_atom(conn, "_NET_WM_STATE_FULLSCREEN");
        belowState = intern_atom(conn, "_NET_WM_STATE_BELOW");
        aboveState = intern_atom(conn, "_NET_WM_STATE_ABOVE");
        skiptaskbarState = intern_atom(conn, "_NET_WM_STATE_SKIP_TASKBAR");
        splashType = intern_atom(conn, "_NET_WM_WINDOW_TYPE_SPLASHSCREEN");
    }

    {
      xcb_get_property_cookie_t cookie_wm_state = xcb_get_property(conn, FALSE, iWindow, windowState, XCB_ATOM_ATOM, 0L, INT_MAX);
      xcb_get_property_reply_t *reply = xcb_get_property_reply(conn, cookie_wm_state, NULL);
      if (reply) {
        int i;
        int nitems = xcb_get_property_value_length(reply)/sizeof(xcb_atom_t);
        xcb_atom_t *pAtom = xcb_get_property_value(reply);

            for (i = 0; i < nitems; i++) {
                if (pAtom[i] == skiptaskbarState)
                    hint |= HINT_SKIPTASKBAR;
                if (pAtom[i] == hiddenState)
                    maxmin |= HINT_MIN;
                else if (pAtom[i] == fullscreenState)
                    maxmin |= HINT_MAX;
                if (pAtom[i] == belowState)
                    *zstyle = HWND_BOTTOM;
                else if (pAtom[i] == aboveState)
                    *zstyle = HWND_TOPMOST;
            }

            free(reply);
      }
    }

    {
      xcb_get_property_cookie_t cookie_mwm_hint = xcb_get_property(conn, FALSE, iWindow, motif_wm_hints, motif_wm_hints, 0L, sizeof(MwmHints));
      xcb_get_property_reply_t *reply =  xcb_get_property_reply(conn, cookie_mwm_hint, NULL);
      if (reply) {
        int nitems = xcb_get_property_value_length(reply)/4;
        MwmHints *mwm_hint = xcb_get_property_value(reply);
        if (mwm_hint && (nitems >= PropMwmHintsElements) &&
            (mwm_hint->flags & MwmHintsDecorations)) {
            if (!mwm_hint->decorations)
                hint |= (HINT_NOFRAME | HINT_NOSYSMENU | HINT_NOMINIMIZE | HINT_NOMAXIMIZE);
            else if (!(mwm_hint->decorations & MwmDecorAll)) {
                if (mwm_hint->decorations & MwmDecorBorder)
                    hint |= HINT_BORDER;
                if (mwm_hint->decorations & MwmDecorHandle)
                    hint |= HINT_SIZEBOX;
                if (mwm_hint->decorations & MwmDecorTitle)
                    hint |= HINT_CAPTION;
                if (!(mwm_hint->decorations & MwmDecorMenu))
                    hint |= HINT_NOSYSMENU;
                if (!(mwm_hint->decorations & MwmDecorMinimize))
                    hint |= HINT_NOMINIMIZE;
                if (!(mwm_hint->decorations & MwmDecorMaximize))
                    hint |= HINT_NOMAXIMIZE;
            }
            else {
                /*
                   MwmDecorAll means all decorations *except* those specified by other flag
                   bits that are set.  Not yet implemented.
                 */
            }
        }
        free(reply);
      }
    }

    {
      int i;
      xcb_ewmh_get_atoms_reply_t type;
      xcb_get_property_cookie_t cookie = xcb_ewmh_get_wm_window_type(&pWMInfo->ewmh, iWindow);
      if (xcb_ewmh_get_wm_window_type_reply(&pWMInfo->ewmh, cookie, &type, NULL)) {
        for (i = 0; i < type.atoms_len; i++) {
            if (type.atoms[i] ==  pWMInfo->ewmh._NET_WM_WINDOW_TYPE_DOCK) {
                hint = (hint & ~HINT_NOFRAME) | HINT_SKIPTASKBAR | HINT_SIZEBOX;
                *zstyle = HWND_TOPMOST;
            }
            else if ((type.atoms[i] == pWMInfo->ewmh._NET_WM_WINDOW_TYPE_SPLASH)
                     || (type.atoms[i] == splashType)) {
                hint |= (HINT_SKIPTASKBAR | HINT_NOSYSMENU | HINT_NOMINIMIZE | HINT_NOMAXIMIZE);
                *zstyle = HWND_TOPMOST;
            }
        }
      }
    }

    {
        xcb_size_hints_t size_hints;
        xcb_get_property_cookie_t cookie;

        cookie = xcb_icccm_get_wm_normal_hints(conn, iWindow);
        if (xcb_icccm_get_wm_normal_hints_reply(conn, cookie, &size_hints, NULL)) {
            if (size_hints.flags & XCB_ICCCM_SIZE_HINT_P_MAX_SIZE) {

                /* Not maximizable if a maximum size is specified, and that size
                   is smaller (in either dimension) than the screen size */
                if ((size_hints.max_width < GetSystemMetrics(SM_CXVIRTUALSCREEN))
                    || (size_hints.max_height < GetSystemMetrics(SM_CYVIRTUALSCREEN)))
                    hint |= HINT_NOMAXIMIZE;

                if (size_hints.flags & XCB_ICCCM_SIZE_HINT_P_MIN_SIZE) {
                    /*
                       If both minimum size and maximum size are specified and are the same,
                       don't bother with a resizing frame
                     */
                    if ((size_hints.min_width == size_hints.max_width)
                        && (size_hints.min_height == size_hints.max_height))
                        hint = (hint & ~HINT_SIZEBOX);
                }
            }
        }
    }

    /*
       Override hint settings from above with settings from config file and set
       application id for grouping.
     */
    {
        char *application_id = 0;
        char *window_name = 0;
        char *res_name = 0;
        char *res_class = 0;

        GetClassNames(pWMInfo, iWindow, &res_name, &res_class, &window_name);

        style = STYLE_NONE;
        style = winOverrideStyle(res_name, res_class, window_name);

#define APPLICATION_ID_FORMAT	"%s.xwin.%s"
#define APPLICATION_ID_UNKNOWN "unknown"
        if (res_class) {
            asprintf(&application_id, APPLICATION_ID_FORMAT, XVENDORNAME,
                     res_class);
        }
        else {
            asprintf(&application_id, APPLICATION_ID_FORMAT, XVENDORNAME,
                     APPLICATION_ID_UNKNOWN);
        }
        winSetAppUserModelID(hWnd, application_id);

        free(application_id);
        free(res_name);
        free(res_class);
        free(window_name);
    }

    if (style & STYLE_TOPMOST)
        *zstyle = HWND_TOPMOST;
    else if (style & STYLE_MAXIMIZE)
        maxmin = (hint & ~HINT_MIN) | HINT_MAX;
    else if (style & STYLE_MINIMIZE)
        maxmin = (hint & ~HINT_MAX) | HINT_MIN;
    else if (style & STYLE_BOTTOM)
        *zstyle = HWND_BOTTOM;

    if (maxmin & HINT_MAX)
        SendMessage(hWnd, WM_SYSCOMMAND, SC_MAXIMIZE, 0);
    else if (maxmin & HINT_MIN)
        SendMessage(hWnd, WM_SYSCOMMAND, SC_MINIMIZE, 0);

    if (style & STYLE_NOTITLE)
        hint =
            (hint & ~HINT_NOFRAME & ~HINT_BORDER & ~HINT_CAPTION) |
            HINT_SIZEBOX;
    else if (style & STYLE_OUTLINE)
        hint =
            (hint & ~HINT_NOFRAME & ~HINT_SIZEBOX & ~HINT_CAPTION) |
            HINT_BORDER;
    else if (style & STYLE_NOFRAME)
        hint =
            (hint & ~HINT_BORDER & ~HINT_CAPTION & ~HINT_SIZEBOX) |
            HINT_NOFRAME;

    /* Now apply styles to window */
    style = GetWindowLongPtr(hWnd, GWL_STYLE);
    if (!style)
        return;                 /* GetWindowLongPointer returns 0 on failure, we hope this isn't a valid style */

    style &= ~WS_CAPTION & ~WS_SIZEBOX; /* Just in case */

    if (!(hint & ~HINT_SKIPTASKBAR))    /* No hints, default */
        style = style | WS_CAPTION | WS_SIZEBOX;
    else if (hint & HINT_NOFRAME)       /* No frame, no decorations */
        style = style & ~WS_CAPTION & ~WS_SIZEBOX;
    else
        style = style | ((hint & HINT_BORDER) ? WS_BORDER : 0) |
            ((hint & HINT_SIZEBOX) ? WS_SIZEBOX : 0) |
            ((hint & HINT_CAPTION) ? WS_CAPTION : 0);

    if (hint & HINT_NOMAXIMIZE)
        style = style & ~WS_MAXIMIZEBOX;

    if (hint & HINT_NOMINIMIZE)
        style = style & ~WS_MINIMIZEBOX;

    if (hint & HINT_NOSYSMENU)
        style = style & ~WS_SYSMENU;

    if (hint & HINT_SKIPTASKBAR)
        style = style & ~WS_MINIMIZEBOX;        /* window will become lost if minimized */

    SetWindowLongPtr(hWnd, GWL_STYLE, style);

    exStyle = GetWindowLongPtr(hWnd, GWL_EXSTYLE);
    if (hint & HINT_SKIPTASKBAR)
        exStyle = (exStyle & ~WS_EX_APPWINDOW) | WS_EX_TOOLWINDOW;
    else
        exStyle = (exStyle & ~WS_EX_TOOLWINDOW) | WS_EX_APPWINDOW;
    SetWindowLongPtr(hWnd, GWL_EXSTYLE, exStyle);

    winDebug
        ("winApplyHints: iWindow 0x%08x hints 0x%08x style 0x%08x exstyle 0x%08x\n",
         iWindow, hint, style, exStyle);
}

void
winUpdateWindowPosition(HWND hWnd, HWND * zstyle)
{
    int iX, iY, iWidth, iHeight;
    int iDx, iDy;
    RECT rcNew;
    WindowPtr pWin = GetProp(hWnd, WIN_WINDOW_PROP);
    DrawablePtr pDraw = NULL;

    if (!pWin)
        return;
    pDraw = &pWin->drawable;
    if (!pDraw)
        return;

    /* Get the X and Y location of the X window */
    iX = pWin->drawable.x + GetSystemMetrics(SM_XVIRTUALSCREEN);
    iY = pWin->drawable.y + GetSystemMetrics(SM_YVIRTUALSCREEN);

    /* Get the height and width of the X window */
    iWidth = pWin->drawable.width;
    iHeight = pWin->drawable.height;

    /* Setup a rectangle with the X window position and size */
    SetRect(&rcNew, iX, iY, iX + iWidth, iY + iHeight);

    winDebug("winUpdateWindowPosition - drawable extent (%d, %d)-(%d, %d)\n",
             rcNew.left, rcNew.top, rcNew.right, rcNew.bottom);

    AdjustWindowRectEx(&rcNew, GetWindowLongPtr(hWnd, GWL_STYLE), FALSE,
                       GetWindowLongPtr(hWnd, GWL_EXSTYLE));

    /* Don't allow window decoration to disappear off to top-left as a result of this adjustment */
    if (rcNew.left < GetSystemMetrics(SM_XVIRTUALSCREEN)) {
        iDx = GetSystemMetrics(SM_XVIRTUALSCREEN) - rcNew.left;
        rcNew.left += iDx;
        rcNew.right += iDx;
    }

    if (rcNew.top < GetSystemMetrics(SM_YVIRTUALSCREEN)) {
        iDy = GetSystemMetrics(SM_YVIRTUALSCREEN) - rcNew.top;
        rcNew.top += iDy;
        rcNew.bottom += iDy;
    }

    winDebug("winUpdateWindowPosition - Window extent (%d, %d)-(%d, %d)\n",
             rcNew.left, rcNew.top, rcNew.right, rcNew.bottom);

    /* Position the Windows window */
    SetWindowPos(hWnd, *zstyle, rcNew.left, rcNew.top,
                 rcNew.right - rcNew.left, rcNew.bottom - rcNew.top, 0);

}