/*
 *  Window Maker window manager
 *
 *  Copyright (c) 1997-2002 Alfredo K. Kojima
 *  Copyright (c) 1998-2002 Dan Pascu
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 
 *  USA.
 */

#include "wconfig.h"

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <sys/wait.h>
#ifdef __FreeBSD__
#include <sys/signal.h>
#endif

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Intrinsic.h>
#include <X11/cursorfont.h>
#include <X11/Xproto.h>
#include <X11/keysym.h>
#ifdef SHAPE
#include <X11/extensions/shape.h>
#endif

#include "WindowMaker.h"
#include "GNUstep.h"
#include "texture.h"
#include "screen.h"
#include "window.h"
#include "actions.h"
#include "client.h"
#include "funcs.h"
#include "dock.h"
#include "workspace.h"
#include "keybind.h"
#include "framewin.h"
#include "session.h"
#include "defaults.h"
#include "properties.h"
#include "dialog.h"
#ifdef XDND
#include "xdnd.h"
#endif

#include "xutil.h"

#ifdef KWM_HINTS
#include "kwm.h"
#endif

#if 0
#ifdef SYS_SIGLIST_DECLARED
extern const char * const sys_siglist[];
#endif
#endif

/* for SunOS */
#ifndef SA_RESTART
# define SA_RESTART 0
#endif

/* Just in case, for weirdo systems */
#ifndef SA_NODEFER
# define SA_NODEFER 0
#endif

/****** Global Variables ******/

extern WPreferences wPreferences;

extern WDDomain *WDWindowMaker;
extern WDDomain *WDRootMenu;
extern WDDomain *WDWindowAttributes;

extern WShortKey wKeyBindings[WKBD_LAST];

extern int wScreenCount;


#ifdef SHAPE
extern Bool wShapeSupported;
extern int wShapeEventBase;
#endif

#ifdef KEEP_XKB_LOCK_STATUS
extern Bool wXkbSupported;
extern int wXkbEventBase;
#endif

/* contexts */
extern XContext wWinContext;
extern XContext wAppWinContext;
extern XContext wStackContext;

/* atoms */
extern Atom _XA_WM_STATE;
extern Atom _XA_WM_CHANGE_STATE;
extern Atom _XA_WM_PROTOCOLS;
extern Atom _XA_WM_TAKE_FOCUS;
extern Atom _XA_WM_DELETE_WINDOW;
extern Atom _XA_WM_SAVE_YOURSELF;
extern Atom _XA_WM_CLIENT_LEADER;
extern Atom _XA_WM_COLORMAP_WINDOWS;
extern Atom _XA_WM_COLORMAP_NOTIFY;

extern Atom _XA_GNUSTEP_WM_ATTR;

extern Atom _XA_WINDOWMAKER_MENU;
extern Atom _XA_WINDOWMAKER_WM_PROTOCOLS;
extern Atom _XA_WINDOWMAKER_STATE;
extern Atom _XA_WINDOWMAKER_WM_FUNCTION;
extern Atom _XA_WINDOWMAKER_NOTICEBOARD;
extern Atom _XA_WINDOWMAKER_COMMAND;
extern Atom _XA_WINDOWMAKER_ICON_SIZE;
extern Atom _XA_WINDOWMAKER_ICON_TILE;

extern Atom _XA_GNUSTEP_WM_MINIATURIZE_WINDOW;
extern Atom _XA_GNUSTEP_TITLEBAR_STATE;

#ifdef OFFIX_DND
extern Atom _XA_DND_PROTOCOL;
extern Atom _XA_DND_SELECTION;
#endif


/* cursors */
extern Cursor wCursor[WCUR_LAST];

/* special flags */
extern char WDelayedActionSet;

/***** Local *****/

static WScreen **wScreen = NULL;


static unsigned int _NumLockMask = 0;
static unsigned int _ScrollLockMask = 0;



static void manageAllWindows(WScreen *scr, int crashed);

extern void NotifyDeadProcess(pid_t pid, unsigned char status);


static int 
catchXError(Display *dpy, XErrorEvent *error)
{
    char buffer[MAXLINE];
    
    /* ignore some errors */
    if (error->resourceid != None 
	&& ((error->error_code == BadDrawable 
	     && error->request_code == X_GetGeometry)
	    || (error->error_code == BadMatch
		&& (error->request_code == X_SetInputFocus))
	    || (error->error_code == BadWindow)
	    /*
		&& (error->request_code == X_GetWindowAttributes
		    || error->request_code == X_SetInputFocus
		    || error->request_code == X_ChangeWindowAttributes
		    || error->request_code == X_GetProperty
		    || error->request_code == X_ChangeProperty
		    || error->request_code == X_QueryTree
		    || error->request_code == X_GrabButton
		    || error->request_code == X_UngrabButton
		    || error->request_code == X_SendEvent
		    || error->request_code == X_ConfigureWindow))
	     */
	    || (error->request_code == X_InstallColormap))) {
#ifndef DEBUG

	return 0;
#else
	printf("got X error %x %x %x\n", error->request_code,
	       error->error_code, (unsigned)error->resourceid);
	return 0;
#endif
    }
    FormatXError(dpy, error, buffer, MAXLINE);
    wwarning(_("internal X error: %s\n"), buffer);
    return -1;
}


/*
 *---------------------------------------------------------------------- 
 * handleXIO-
 * 	Handle X shutdowns and other stuff. 
 *---------------------------------------------------------------------- 
 */
static int
handleXIO(Display *xio_dpy)
{
    dpy = NULL;
    Exit(0);
    return 0;
}


/*
 *----------------------------------------------------------------------
 * delayedAction-
 * 	Action to be executed after the signal() handler is exited.
 *----------------------------------------------------------------------
 */
static void
delayedAction(void *cdata)
{
    if (WDelayedActionSet == 0) {
	return;
    }
    WDelayedActionSet--;
    /* 
     * Make the event dispatcher do whatever it needs to do,
     * including handling zombie processes, restart and exit 
     * signals.
     */
    DispatchEvent(NULL);
}


/*
 *----------------------------------------------------------------------
 * handleExitSig--
 * 	User generated exit signal handler.
 *---------------------------------------------------------------------- 
 */
static RETSIGTYPE
handleExitSig(int sig)
{
    sigset_t sigs;

    sigfillset(&sigs);
    sigprocmask(SIG_BLOCK, &sigs, NULL);
    
    if (sig == SIGUSR1) {
#ifdef SYS_SIGLIST_DECLARED
        wwarning(_("got signal %i (%s) - restarting\n"), sig, sys_siglist[sig]);
#else
        wwarning(_("got signal %i - restarting\n"), sig);
#endif

	SIG_WCHANGE_STATE(WSTATE_NEED_RESTART);
	/* setup idle handler, so that this will be handled when
	 * the select() is returned becaused of the signal, even if
	 * there are no X events in the queue */
	WDelayedActionSet++;
    } else if (sig == SIGUSR2) {
#ifdef SYS_SIGLIST_DECLARED
        wwarning(_("got signal %i (%s) - rereading defaults\n"), sig, sys_siglist[sig]);
#else
        wwarning(_("got signal %i - rereading defaults\n"), sig);
#endif

        SIG_WCHANGE_STATE(WSTATE_NEED_REREAD);
        /* setup idle handler, so that this will be handled when
         * the select() is returned becaused of the signal, even if
         * there are no X events in the queue */
        WDelayedActionSet++;
    } else if (sig==SIGTERM || sig==SIGINT || sig==SIGHUP) {
#ifdef SYS_SIGLIST_DECLARED
        wwarning(_("got signal %i (%s) - exiting...\n"), sig, sys_siglist[sig]);
#else
        wwarning(_("got signal %i - exiting...\n"), sig);
#endif

	SIG_WCHANGE_STATE(WSTATE_NEED_EXIT);

	WDelayedActionSet++;
    }
    
    sigprocmask(SIG_UNBLOCK, &sigs, NULL);
}

/* Dummy signal handler */
static void
dummyHandler(int sig)
{
}


/*
 *----------------------------------------------------------------------
 * handleSig--
 * 	general signal handler. Exits the program gently.
 *---------------------------------------------------------------------- 
 */
static RETSIGTYPE
handleSig(int sig)
{
    static int already_crashed = 0;
    int dumpcore = 0;
#ifndef NO_EMERGENCY_AUTORESTART
    int crashAction, i;
    char *argv[2];
    
    argv[1] = NULL;
#endif
    
    /* 
     * No functions that potentially do Xlib calls should be called from
     * here. Xlib calls are not reentrant so the integrity of Xlib is
     * not guaranteed if a Xlib call is made from a signal handler.
     */

#ifdef SYS_SIGLIST_DECLARED
    wfatal(_("got signal %i (%s)\n"), sig, sys_siglist[sig]);
#else
    wfatal(_("got signal %i\n"), sig);
#endif

    /* Setting the signal behaviour back to default and then reraising the
     * signal is a cleaner way to make program exit and core dump than calling
     * abort(), since it correctly returns from the signal handler and sets
     * the flags accordingly. -Dan
     */
    if (sig==SIGSEGV || sig==SIGFPE || sig==SIGBUS || sig==SIGILL
	|| sig==SIGABRT) {
	if (already_crashed) {
	    wfatal(_("crashed while trying to do some post-crash cleanup. Aborting immediatelly."));
            signal(sig, SIG_DFL);
            kill(getpid(), sig);
            return;
	}
	already_crashed = 1;

	dumpcore = 1;

	/*
	 * Yeah, we shouldn't do this, but it's already crashed anyway :P
	 */
	
#ifndef NO_EMERGENCY_AUTORESTART
        /* Close the X connection and open a new one. This is to avoid messing
         * Xlib because we call to Xlib functions in a signal handler.
         */
        if (dpy)
            XCloseDisplay(dpy);
        dpy = XOpenDisplay("");
        if (dpy) {
            CARD32 data[2];
            WWindow *wwin;

	    XGrabServer(dpy);
            crashAction = wShowCrashingDialogPanel(sig);

            /*
             * Save current workspace, so can go back to it if restarting.
             * Also add hint that we crashed, so that windows will be placed
             * correctly upon restart.
             */
            for (i=0; i<wScreenCount; i++) {
                data[0] = wScreen[i]->current_workspace; /* workspace number */
                data[1] = WFLAGS_CRASHED; /* signal that we crashed */

                XChangeProperty(dpy, wScreen[i]->root_win,
                                _XA_WINDOWMAKER_STATE, _XA_WINDOWMAKER_STATE,
                                32, PropModeReplace, (unsigned char*) data, 2);

                /* save state of windows */
                wwin = wScreen[i]->focused_window;
                while (wwin) {
                    wWindowSaveState(wwin);
                    wwin = wwin->prev;
                }

            }
    
            XCloseDisplay(dpy);
            dpy = NULL;
        } else {
            wsyserror(_("cannot open connection for crashing dialog panel. Aborting."));
            crashAction = WMAbort;
        }

        if (crashAction == WMAbort) {
            signal(sig, SIG_DFL);
            kill(getpid(), sig);
            return;
        }

        if (crashAction == WMRestart) {
            /* we try to restart Window Maker */
            wmessage(_("trying to restart Window Maker..."));
            Restart(NULL, False);
            /* fallback to alternate window manager then */
        }

    	wmessage(_("trying to start alternate window manager..."));

        for (i=0; i<WMGetArrayItemCount(wPreferences.fallbackWMs); i++) {
            Restart(WMGetFromArray(wPreferences.fallbackWMs, i), False);
        }

        wfatal(_("failed to start alternate window manager. Aborting."));
#else
        wfatal(_("a fatal error has occured, probably due to a bug. "
                 "Please fill the included BUGFORM and report it."));
#endif /* !NO_EMERGENCY_AUTORESTART */

        signal(sig, SIG_DFL);
        kill(getpid(), sig);
        return;

    }

    wAbort(dumpcore);
}


static RETSIGTYPE
buryChild(int foo)
{
    pid_t pid;
    int status;
    int save_errno = errno;
    sigset_t sigs;

    sigfillset(&sigs);
    /* Block signals so that NotifyDeadProcess() doesn't get fux0red */
    sigprocmask(SIG_BLOCK, &sigs, NULL);
    
    /* R.I.P. */
    /* If 2 or more kids exit in a small time window, before this handler gets
     * the chance to get invoked, the SIGCHLD signals will be merged and only
     * one SIGCHLD signal will be sent to us. We use a while loop to get all
     * exited child status because we can't count on the number of SIGCHLD
     * signals to know exactly how many kids have exited. -Dan
     */
    while ((pid=waitpid(-1, &status, WNOHANG))>0 || (pid<0 && errno==EINTR)) {
	NotifyDeadProcess(pid, WEXITSTATUS(status));
    }

    WDelayedActionSet++;
    
    sigprocmask(SIG_UNBLOCK, &sigs, NULL);

    errno = save_errno;    
}


static int
getWorkspaceState(Window root, WWorkspaceState **state)
{
    Atom type_ret;
    int fmt_ret;    
    unsigned long nitems_ret;
    unsigned long bytes_after_ret;
    CARD32 *data;

    if (XGetWindowProperty(dpy, root, _XA_WINDOWMAKER_STATE, 0, 2,
                           True, _XA_WINDOWMAKER_STATE,
                           &type_ret, &fmt_ret, &nitems_ret, &bytes_after_ret,
                           (unsigned char **)&data)!=Success || !data)
        return 0;

    *state = wmalloc(sizeof(WWorkspaceState));
    (*state)->workspace = data[0];
    (*state)->flags = data[1];

    XFree(data);

    if (*state && type_ret==_XA_WINDOWMAKER_STATE)
        return 1;
    else
        return 0;
}


static void
getOffendingModifiers()
{
    int i;
    XModifierKeymap *modmap;
    KeyCode nlock, slock;
    static int mask_table[8] = {
	ShiftMask,LockMask,ControlMask,Mod1Mask,
	    Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask
    };

    nlock = XKeysymToKeycode(dpy, XK_Num_Lock);
    slock = XKeysymToKeycode(dpy, XK_Scroll_Lock);

    /*
     * Find out the masks for the NumLock and ScrollLock modifiers,
     * so that we can bind the grabs for when they are enabled too.
     */
    modmap = XGetModifierMapping(dpy);
    
    if (modmap!=NULL && modmap->max_keypermod>0) {
	for (i=0; i<8*modmap->max_keypermod; i++) {
	    if (modmap->modifiermap[i]==nlock && nlock!=0)
		_NumLockMask = mask_table[i/modmap->max_keypermod];
	    else if (modmap->modifiermap[i]==slock && slock!=0)
		_ScrollLockMask = mask_table[i/modmap->max_keypermod];
	}
    }

    if (modmap)
	XFreeModifiermap(modmap);
}



#ifdef NUMLOCK_HACK
void 
wHackedGrabKey(int keycode, unsigned int modifiers,
	       Window grab_window, Bool owner_events, int pointer_mode,
	       int keyboard_mode)
{
    if (modifiers == AnyModifier)
	return;
    
    /* grab all combinations of the modifier with CapsLock, NumLock and
     * ScrollLock. How much memory/CPU does such a monstrosity consume
     * in the server?
     */
    if (_NumLockMask)
	XGrabKey(dpy, keycode, modifiers|_NumLockMask, 
		 grab_window, owner_events, pointer_mode, keyboard_mode);
    if (_ScrollLockMask)
	XGrabKey(dpy, keycode, modifiers|_ScrollLockMask,
		 grab_window, owner_events, pointer_mode, keyboard_mode);
    if (_NumLockMask && _ScrollLockMask)
	XGrabKey(dpy, keycode, modifiers|_NumLockMask|_ScrollLockMask,
		 grab_window, owner_events, pointer_mode, keyboard_mode);
    if (_NumLockMask)
	XGrabKey(dpy, keycode, modifiers|_NumLockMask|LockMask,
		 grab_window, owner_events, pointer_mode, keyboard_mode);
    if (_ScrollLockMask)
	XGrabKey(dpy, keycode, modifiers|_ScrollLockMask|LockMask,
		 grab_window, owner_events, pointer_mode, keyboard_mode);
    if (_NumLockMask && _ScrollLockMask)
	XGrabKey(dpy, keycode, modifiers|_NumLockMask|_ScrollLockMask|LockMask,
		 grab_window, owner_events, pointer_mode, keyboard_mode);
    /* phew, I guess that's all, right? */
}
#endif

void 
wHackedGrabButton(unsigned int button, unsigned int modifiers, 
		  Window grab_window, Bool owner_events, 
		  unsigned int event_mask, int pointer_mode, 
		  int keyboard_mode, Window confine_to, Cursor cursor)
{
    XGrabButton(dpy, button, modifiers, grab_window, owner_events,
		event_mask, pointer_mode, keyboard_mode, confine_to, cursor);

    if (modifiers==AnyModifier)
	return;

    XGrabButton(dpy, button, modifiers|LockMask, grab_window, owner_events,
		event_mask, pointer_mode, keyboard_mode, confine_to, cursor);
    
#ifdef NUMLOCK_HACK    
    /* same as above, but for mouse buttons */
    if (_NumLockMask)
	XGrabButton(dpy, button, modifiers|_NumLockMask,
		    grab_window, owner_events, event_mask, pointer_mode,
		keyboard_mode, confine_to, cursor);
    if (_ScrollLockMask)
	XGrabButton(dpy, button, modifiers|_ScrollLockMask,
		    grab_window, owner_events, event_mask, pointer_mode,
		    keyboard_mode, confine_to, cursor);
    if (_NumLockMask && _ScrollLockMask)
	XGrabButton(dpy, button, modifiers|_ScrollLockMask|_NumLockMask,
		    grab_window, owner_events, event_mask, pointer_mode,
		    keyboard_mode, confine_to, cursor);
    if (_NumLockMask)
	XGrabButton(dpy, button, modifiers|_NumLockMask|LockMask,
		    grab_window, owner_events, event_mask, pointer_mode,
		keyboard_mode, confine_to, cursor);
    if (_ScrollLockMask)
	XGrabButton(dpy, button, modifiers|_ScrollLockMask|LockMask,
		    grab_window, owner_events, event_mask, pointer_mode,
		    keyboard_mode, confine_to, cursor);
    if (_NumLockMask && _ScrollLockMask)
	XGrabButton(dpy, button, modifiers|_ScrollLockMask|_NumLockMask|LockMask,
		    grab_window, owner_events, event_mask, pointer_mode,
		    keyboard_mode, confine_to, cursor);
#endif /* NUMLOCK_HACK */
}

#ifdef notused
void
wHackedUngrabButton(unsigned int button, unsigned int modifiers, 
		    Window grab_window)
{
    XUngrabButton(dpy, button, modifiers|_NumLockMask,
		  grab_window);
    XUngrabButton(dpy, button, modifiers|_ScrollLockMask,
		  grab_window);
    XUngrabButton(dpy, button, modifiers|_NumLockMask|_ScrollLockMask,
		  grab_window);
    XUngrabButton(dpy, button, modifiers|_NumLockMask|LockMask,
		  grab_window);
    XUngrabButton(dpy, button, modifiers|_ScrollLockMask|LockMask,
		  grab_window);
    XUngrabButton(dpy, button, modifiers|_NumLockMask|_ScrollLockMask|LockMask,
		  grab_window);
}
#endif



WScreen*
wScreenWithNumber(int i)
{
    assert(i < wScreenCount);

    return wScreen[i];
}


WScreen*
wScreenForRootWindow(Window window)
{
    int i;

    if (wScreenCount==1)
	return wScreen[0];

    /*
     * Since the number of heads will probably be small (normally 2),
     * it should be faster to use this than a hash table, because
     * of the overhead.
     */
    for (i=0; i<wScreenCount; i++) {
	if (wScreen[i]->root_win == window) {
	    return wScreen[i];
	}
    }

    return wScreenForWindow(window);
}


WScreen*
wScreenSearchForRootWindow(Window window)
{
    int i;

    if (wScreenCount==1)
	return wScreen[0];

    /*
     * Since the number of heads will probably be small (normally 2),
     * it should be faster to use this than a hash table, because
     * of the overhead.
     */
    for (i=0; i<wScreenCount; i++) {
	if (wScreen[i]->root_win == window) {
	    return wScreen[i];
	}
    }
    
    return wScreenForWindow(window);
}


WScreen*
wScreenForWindow(Window window)
{
    XWindowAttributes attr;

    if (wScreenCount==1)
	return wScreen[0];

    if (XGetWindowAttributes(dpy, window, &attr)) {
	return wScreenForRootWindow(attr.root);
    }
    return NULL;
}


static char *atomNames[] = {
    "WM_STATE", 
    "WM_CHANGE_STATE", 
    "WM_PROTOCOLS", 
    "WM_TAKE_FOCUS", 
    "WM_DELETE_WINDOW", 
    "WM_SAVE_YOURSELF", 
    "WM_CLIENT_LEADER", 
    "WM_COLORMAP_WINDOWS", 
    "WM_COLORMAP_NOTIFY", 

    "_WINDOWMAKER_MENU",
    "_WINDOWMAKER_STATE", 
    "_WINDOWMAKER_WM_PROTOCOLS", 
    "_WINDOWMAKER_WM_FUNCTION",
    "_WINDOWMAKER_NOTICEBOARD",
    "_WINDOWMAKER_COMMAND",
    "_WINDOWMAKER_ICON_SIZE",
    "_WINDOWMAKER_ICON_TILE",

    GNUSTEP_WM_ATTR_NAME,
    GNUSTEP_WM_MINIATURIZE_WINDOW,
    GNUSTEP_TITLEBAR_STATE
};


/*
 *----------------------------------------------------------
 * StartUp--
 * 	starts the window manager and setup global data.
 * Called from main() at startup.
 * 
 * Side effects:
 * global data declared in main.c is initialized
 *----------------------------------------------------------
 */
void
StartUp(Bool defaultScreenOnly)
{
    WWorkspaceState *ws_state;
    struct sigaction sig_action;
    int j, max;
    Atom atom[sizeof(atomNames)/sizeof(char*)];

    /*
     * Ignore CapsLock in modifiers
     */
    ValidModMask = 0xff & ~LockMask;

    getOffendingModifiers();
    /*
     * Ignore NumLock and ScrollLock too
     */
    ValidModMask &= ~(_NumLockMask|_ScrollLockMask);


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

    wWinContext = XUniqueContext();
    wAppWinContext = XUniqueContext();
    wStackContext = XUniqueContext();

/*    _XA_VERSION = XInternAtom(dpy, "VERSION", False);*/

#ifdef HAVE_XINTERNATOMS
    XInternAtoms(dpy, atomNames, sizeof(atomNames)/sizeof(char*),
		 False, atom);
#else

    {
	int i;
	for (i = 0; i < sizeof(atomNames)/sizeof(char*); i++) {
	    atom[i] = XInternAtom(dpy, atomNames[i], False);
	}
    }
#endif
    
    _XA_WM_STATE = atom[0];
    _XA_WM_CHANGE_STATE = atom[1];
    _XA_WM_PROTOCOLS = atom[2];
    _XA_WM_TAKE_FOCUS = atom[3];
    _XA_WM_DELETE_WINDOW = atom[4];
    _XA_WM_SAVE_YOURSELF = atom[5];
    _XA_WM_CLIENT_LEADER = atom[6];
    _XA_WM_COLORMAP_WINDOWS = atom[7];
    _XA_WM_COLORMAP_NOTIFY = atom[8];

    _XA_WINDOWMAKER_MENU = atom[9];
    _XA_WINDOWMAKER_STATE = atom[10];
    _XA_WINDOWMAKER_WM_PROTOCOLS = atom[11];
    _XA_WINDOWMAKER_WM_FUNCTION = atom[12];
    _XA_WINDOWMAKER_NOTICEBOARD = atom[13];
    _XA_WINDOWMAKER_COMMAND = atom[14];
    _XA_WINDOWMAKER_ICON_SIZE = atom[15];
    _XA_WINDOWMAKER_ICON_TILE = atom[16];

    _XA_GNUSTEP_WM_ATTR = atom[17];
    _XA_GNUSTEP_WM_MINIATURIZE_WINDOW = atom[18];
    _XA_GNUSTEP_TITLEBAR_STATE = atom[19];

#ifdef OFFIX_DND
    _XA_DND_SELECTION = XInternAtom(dpy, "DndSelection", False);
    _XA_DND_PROTOCOL = XInternAtom(dpy, "DndProtocol", False);
#endif
#ifdef XDND
    wXDNDInitializeAtoms();
#endif


    /* cursors */
    wCursor[WCUR_NORMAL] = None; /* inherit from root */
    wCursor[WCUR_ROOT] = XCreateFontCursor(dpy, XC_left_ptr);
    wCursor[WCUR_ARROW] = XCreateFontCursor(dpy, XC_top_left_arrow);
    wCursor[WCUR_MOVE] = XCreateFontCursor(dpy, XC_fleur);
    wCursor[WCUR_RESIZE] = XCreateFontCursor(dpy, XC_sizing);
    wCursor[WCUR_TOPLEFTRESIZE] = XCreateFontCursor(dpy, XC_top_left_corner);
    wCursor[WCUR_TOPRIGHTRESIZE] = XCreateFontCursor(dpy, XC_top_right_corner);
    wCursor[WCUR_BOTTOMLEFTRESIZE] = XCreateFontCursor(dpy, XC_bottom_left_corner);
    wCursor[WCUR_BOTTOMRIGHTRESIZE] = XCreateFontCursor(dpy, XC_bottom_right_corner);
    wCursor[WCUR_VERTICALRESIZE] = XCreateFontCursor(dpy, XC_sb_v_double_arrow);
    wCursor[WCUR_HORIZONRESIZE] = XCreateFontCursor(dpy, XC_sb_h_double_arrow);
    wCursor[WCUR_WAIT] = XCreateFontCursor(dpy, XC_watch);
    wCursor[WCUR_QUESTION] = XCreateFontCursor(dpy, XC_question_arrow);
    wCursor[WCUR_TEXT]     = XCreateFontCursor(dpy, XC_xterm); /* odd name???*/
    wCursor[WCUR_SELECT] = XCreateFontCursor(dpy, XC_cross);
    
    /* signal handler stuff that gets called when a signal is caught */
    WMAddPersistentTimerHandler(500, delayedAction, NULL);

    /* emergency exit... */
    sig_action.sa_handler = handleSig;
    sigemptyset(&sig_action.sa_mask);

    sig_action.sa_flags = SA_RESTART;
    sigaction(SIGQUIT, &sig_action, NULL);
    sigaction(SIGSEGV, &sig_action, NULL);
    sigaction(SIGBUS, &sig_action, NULL);
    sigaction(SIGFPE, &sig_action, NULL);
    sigaction(SIGABRT, &sig_action, NULL);

    sig_action.sa_handler = handleExitSig;
    
    /* Here we set SA_RESTART for safety, because SIGUSR1 may not be handled
     * immediately. -Dan */
    sig_action.sa_flags = SA_RESTART;
    sigaction(SIGTERM, &sig_action, NULL);
    sigaction(SIGINT, &sig_action, NULL);
    sigaction(SIGHUP, &sig_action, NULL);
    sigaction(SIGUSR1, &sig_action, NULL);
    sigaction(SIGUSR2, &sig_action, NULL);

    /* ignore dead pipe */
    /* Because POSIX mandates that only signal with handlers are reset
     * accross an exec*(), we do not want to propagate ignoring SIGPIPEs
     * to children. Hence the dummy handler.
     * Philippe Troin <phil@fifi.org>
     */
    sig_action.sa_handler = &dummyHandler;
    sig_action.sa_flags = SA_RESTART;
    sigaction(SIGPIPE, &sig_action, NULL);

    /* handle dead children */
    sig_action.sa_handler = buryChild;
    sig_action.sa_flags = SA_NOCLDSTOP|SA_RESTART;
    sigaction(SIGCHLD, &sig_action, NULL);

    /* Now we unblock all signals, that may have been blocked by the parent
     * who exec()-ed us. This can happen for example if Window Maker crashes
     * and restarts itself or another window manager from the signal handler.
     * In this case, the new proccess inherits the blocked signal mask and
     * will no longer react to that signal, until unblocked.
     * This is because the signal handler of the proccess who crashed (parent)
     * didn't return, and the signal remained blocked. -Dan
     */
    sigfillset(&sig_action.sa_mask);
    sigprocmask(SIG_UNBLOCK, &sig_action.sa_mask, NULL);

    /* handle X shutdowns a such */
    XSetIOErrorHandler(handleXIO);

    /* set hook for out event dispatcher in WINGs event dispatcher */
    WMHookEventHandler(DispatchEvent);

    /* initialize defaults stuff */
    WDWindowMaker = wDefaultsInitDomain("WindowMaker", True);
    if (!WDWindowMaker->dictionary) {
	wwarning(_("could not read domain \"%s\" from defaults database"),
		 "WindowMaker");
    }

    /* read defaults that don't change until a restart and are
     * screen independent */
    wReadStaticDefaults(WDWindowMaker ? WDWindowMaker->dictionary : NULL);

    /* check sanity of some values */
    if (wPreferences.icon_size < 16) {
	wwarning(_("icon size is configured to %i, but it's too small. Using 16, instead\n"),
		 wPreferences.icon_size);
	wPreferences.icon_size = 16;
    }

    /* init other domains */
    WDRootMenu = wDefaultsInitDomain("WMRootMenu", False);
    if (!WDRootMenu->dictionary) {
	wwarning(_("could not read domain \"%s\" from defaults database"),
		 "WMRootMenu");
    }

    WDWindowAttributes = wDefaultsInitDomain("WMWindowAttributes", True);
    if (!WDWindowAttributes->dictionary) {
	wwarning(_("could not read domain \"%s\" from defaults database"),
		 "WMWindowAttributes");
    }

    XSetErrorHandler((XErrorHandler)catchXError);

#ifdef SHAPE
    /* ignore j */
    wShapeSupported = XShapeQueryExtension(dpy, &wShapeEventBase, &j);
#endif
    
#ifdef KEEP_XKB_LOCK_STATUS
    wXkbSupported = XkbQueryExtension(dpy, NULL, &wXkbEventBase, NULL, NULL, NULL);
    if(wPreferences.modelock && !wXkbSupported) {
        wwarning(_("XKB is not supported. KbdModeLock is automatically disabled."));
        wPreferences.modelock = 0;
    }
#endif

    if (defaultScreenOnly) {
	max = 1;
    } else {
	max = ScreenCount(dpy);
    }
    wScreen = wmalloc(sizeof(WScreen*)*max);

    wScreenCount = 0;

    /* manage the screens */
    for (j = 0; j < max; j++) {
	if (defaultScreenOnly || max==1) {
	    wScreen[wScreenCount] = wScreenInit(DefaultScreen(dpy));
	    if (!wScreen[wScreenCount]) {
		wfatal(_("it seems that there is already a window manager running"));
		Exit(1);
	    }
	} else {
	    wScreen[wScreenCount] = wScreenInit(j);
	    if (!wScreen[wScreenCount]) {
		wwarning(_("could not manage screen %i"), j);
		continue;
	    }
	}
	wScreenCount++;
    }

    /* initialize/restore state for the screens */
    for (j = 0; j < wScreenCount; j++) {
        int crashed;

        /* restore workspace state */
	if (!getWorkspaceState(wScreen[j]->root_win, &ws_state)) {
	    ws_state = NULL;
	}

	wScreenRestoreState(wScreen[j]);

	/* manage all windows that were already here before us */
	if (!wPreferences.flags.nodock && wScreen[j]->dock)
	    wScreen[j]->last_dock = wScreen[j]->dock;

        if (ws_state && (ws_state->flags & WFLAGS_CRASHED)!=0)
            crashed = 1;
        else
            crashed = 0;

        manageAllWindows(wScreen[j], crashed);

	/* restore saved menus */
	wMenuRestoreState(wScreen[j]);
	
	/* If we're not restarting restore session */
	if (ws_state == NULL && !wPreferences.flags.norestore)
	    wSessionRestoreState(wScreen[j]);
	
	if (!wPreferences.flags.noautolaunch) {
	    /* auto-launch apps */
	    if (!wPreferences.flags.nodock && wScreen[j]->dock) {
		wScreen[j]->last_dock = wScreen[j]->dock;
		wDockDoAutoLaunch(wScreen[j]->dock, 0);
	    }
	    /* auto-launch apps in clip */
	    if (!wPreferences.flags.noclip) {
		int i;
		for(i=0; i<wScreen[j]->workspace_count; i++) {
		    if (wScreen[j]->workspaces[i]->clip) {
			wScreen[j]->last_dock = wScreen[j]->workspaces[i]->clip;
			wDockDoAutoLaunch(wScreen[j]->workspaces[i]->clip, i);
		    }
		}
	    }
	}

	/* go to workspace where we were before restart */
	if (ws_state) { 
	    wWorkspaceForceChange(wScreen[j], ws_state->workspace);
	    wfree(ws_state);
	} else {
	    wSessionRestoreLastWorkspace(wScreen[j]);
	}

#ifdef KWM_HINTS
	wKWMSetInitializedHint(wScreen[j]);
#endif
    }
    
    if (wScreenCount == 0) {
	wfatal(_("could not manage any screen"));
	Exit(1);
    }

    if (!wPreferences.flags.nopolling && !wPreferences.flags.noupdates) {
	/* setup defaults file polling */
	WMAddTimerHandler(3000, wDefaultsCheckDomains, NULL);
    }
}




static Bool
windowInList(Window window, Window *list, int count)
{
    for (; count>=0; count--) {
	if (window == list[count])
	    return True;
    }
    return False;
}

/*
 *-----------------------------------------------------------------------
 * manageAllWindows--
 * 	Manages all windows in the screen.
 * 
 * Notes:
 * 	Called when the wm is being started.
 *	No events can be processed while the windows are being
 * reparented/managed. 
 *----------------------------------------------------------------------- 
 */
static void
manageAllWindows(WScreen *scr, int crashRecovery)
{
    Window root, parent;
    Window *children;
    unsigned int nchildren;
    unsigned int i, j;
    WWindow *wwin;

    XGrabServer(dpy);
    XQueryTree(dpy, scr->root_win, &root, &parent, &children, &nchildren);

    scr->flags.startup = 1;

    /* first remove all icon windows */
    for (i = 0; i < nchildren; i++) {
	XWMHints *wmhints;

	if (children[i]==None) 
	    continue;

    	wmhints = XGetWMHints(dpy, children[i]);
	if (wmhints && (wmhints->flags & IconWindowHint)) {
	    for (j = 0; j < nchildren; j++)  {
		if (children[j] == wmhints->icon_window) {
		    XFree(wmhints);
		    wmhints = NULL;
		    children[j] = None;
		    break;
		}
	    }
	}
	if (wmhints) {
	    XFree(wmhints);
	}
    }


    for (i = 0; i < nchildren; i++) {
	if (children[i] == None)
	    continue;

#ifdef KWM_HINTS
	wKWMCheckModule(scr, children[i]);
#endif
	wwin = wManageWindow(scr, children[i]);
	if (wwin) {
	    /* apply states got from WSavedState */
	    /* shaded + minimized is not restored correctly */
	    if (wwin->flags.shaded) {
		wwin->flags.shaded = 0;
		wShadeWindow(wwin);
	    }
	    if (wwin->flags.miniaturized
		&& (wwin->transient_for == None
		    || wwin->transient_for == scr->root_win
		    || !windowInList(wwin->transient_for, children, 
				     nchildren))) {

		wwin->flags.skip_next_animation = 1;
		wwin->flags.miniaturized = 0;
		wIconifyWindow(wwin);
	    } else {
		wClientSetState(wwin, NormalState, None);
            }
            if (crashRecovery) {
                int border;

                border = (WFLAGP(wwin, no_border) ? 0 : FRAME_BORDER_WIDTH);

                wWindowMove(wwin, wwin->frame_x - border,
                            wwin->frame_y - border -
			    (wwin->frame->titlebar ? 
                             wwin->frame->titlebar->height : 0));
            }
	}
    }
    XUngrabServer(dpy);

    /* hide apps */
    wwin = scr->focused_window;
    while (wwin) {
	if (wwin->flags.hidden) {
	    WApplication *wapp = wApplicationOf(wwin->main_window);

	    if (wapp) {
		wwin->flags.hidden = 0;
		wHideApplication(wapp);
	    } else {
		wwin->flags.hidden = 0;
	    }
	}
	wwin = wwin->prev;
    }

    XFree(children);
    scr->flags.startup = 0;
    scr->flags.startup2 = 1;

    while (XPending(dpy)) {
	XEvent ev;
	WMNextEvent(dpy, &ev);
	WMHandleEvent(&ev);
    }
    wWorkspaceForceChange(scr, 0);
    if (!wPreferences.flags.noclip)
        wDockShowIcons(scr->workspaces[scr->current_workspace]->clip);
    scr->flags.startup2 = 0;
}



