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- /*
- * xdm - display manager daemon
- *
- * $XConsortium: reset.c,v 1.9 91/09/12 19:56:12 keith Exp $
- *
- * Copyright 1988 Massachusetts Institute of Technology
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted, provided
- * that the above copyright notice appear in all copies and that both that
- * copyright notice and this permission notice appear in supporting
- * documentation, and that the name of M.I.T. not be used in advertising or
- * publicity pertaining to distribution of the software without specific,
- * written prior permission. M.I.T. makes no representations about the
- * suitability of this software for any purpose. It is provided "as is"
- * without express or implied warranty.
- *
- * Author: Keith Packard, MIT X Consortium
- */
-
- /*
- * pseudoReset -- pretend to reset the server by killing all clients
- * with windows. It will reset the server most of the time, unless
- * a client remains connected with no windows.
- */
-
- # include "dm.h"
- # include <X11/Xlib.h>
- # include <signal.h>
-
- /*ARGSUSED*/
- static int
- ignoreErrors (dpy, event)
- Display *dpy;
- XErrorEvent *event;
- {
- Debug ("ignoring error\n");
- }
-
- /*
- * this is mostly bogus -- but quite useful. I wish the protocol
- * had some way of enumerating and identifying clients, that way
- * this code wouldn't have to be this kludgy.
- */
-
- static
- killWindows (dpy, window)
- Display *dpy;
- Window window;
- {
- Window root, parent, *children;
- int child;
- unsigned int nchildren = 0;
-
- while (XQueryTree (dpy, window, &root, &parent, &children, &nchildren)
- && nchildren > 0)
- {
- for (child = 0; child < nchildren; child++) {
- Debug ("XKillClient 0x%x\n", children[child]);
- XKillClient (dpy, children[child]);
- }
- XFree ((char *)children);
- }
- }
-
- static jmp_buf resetJmp;
-
- /* ARGSUSED */
- static SIGVAL
- abortReset (n)
- int n;
- {
- Longjmp (resetJmp, 1);
- }
-
- /*
- * this display connection better not have any windows...
- */
-
- pseudoReset (dpy)
- Display *dpy;
- {
- Window root;
- int screen;
-
- if (Setjmp (resetJmp)) {
- LogError ("pseudoReset timeout\n");
- } else {
- (void) Signal (SIGALRM, abortReset);
- (void) alarm (30);
- XSetErrorHandler (ignoreErrors);
- for (screen = 0; screen < ScreenCount (dpy); screen++) {
- Debug ("pseudoReset screen %d\n", screen);
- root = RootWindow (dpy, screen);
- killWindows (dpy, root);
- }
- Debug ("before XSync\n");
- XSync (dpy, False);
- (void) alarm (0);
- }
- Signal (SIGALRM, SIG_DFL);
- XSetErrorHandler ((int (*)()) 0);
- Debug ("pseudoReset done\n");
- }
-