116 lines
3.0 KiB
C
116 lines
3.0 KiB
C
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/* $Xorg: reset.c,v 1.4 2001/02/09 02:05:40 xorgcvs Exp $ */
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/*
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Copyright 1988, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from The Open Group.
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*/
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/* $XFree86: xc/programs/xdm/reset.c,v 1.3 2001/01/17 23:45:21 dawes Exp $ */
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/*
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* xdm - display manager daemon
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* Author: Keith Packard, MIT X Consortium
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*
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* pseudoReset -- pretend to reset the server by killing all clients
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* with windows. It will reset the server most of the time, unless
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* a client remains connected with no windows.
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*/
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# include "dm.h"
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# include "dm_error.h"
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# include <X11/Xlib.h>
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# include <signal.h>
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/*ARGSUSED*/
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static int
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ignoreErrors (Display *dpy, XErrorEvent *event)
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{
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Debug ("ignoring error\n");
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return 0;
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}
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/*
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* this is mostly bogus -- but quite useful. I wish the protocol
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* had some way of enumerating and identifying clients, that way
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* this code wouldn't have to be this kludgy.
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*/
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static void
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killWindows (Display *dpy, Window window)
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{
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Window root, parent, *children;
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int child;
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unsigned int nchildren = 0;
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while (XQueryTree (dpy, window, &root, &parent, &children, &nchildren)
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&& nchildren > 0)
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{
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for (child = 0; child < nchildren; child++) {
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Debug ("XKillClient 0x%lx\n", (unsigned long)children[child]);
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XKillClient (dpy, children[child]);
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}
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XFree ((char *)children);
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}
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}
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static Jmp_buf resetJmp;
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/* ARGSUSED */
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static SIGVAL
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abortReset (int n)
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{
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Longjmp (resetJmp, 1);
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}
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/*
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* this display connection better not have any windows...
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*/
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void
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pseudoReset (Display *dpy)
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{
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Window root;
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int screen;
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if (Setjmp (resetJmp)) {
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LogError ("pseudoReset timeout\n");
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} else {
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(void) Signal (SIGALRM, abortReset);
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(void) alarm (30);
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XSetErrorHandler (ignoreErrors);
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for (screen = 0; screen < ScreenCount (dpy); screen++) {
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Debug ("pseudoReset screen %d\n", screen);
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root = RootWindow (dpy, screen);
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killWindows (dpy, root);
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}
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Debug ("before XSync\n");
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XSync (dpy, False);
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(void) alarm (0);
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}
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Signal (SIGALRM, SIG_DFL);
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XSetErrorHandler ((XErrorHandler)0 );
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Debug ("pseudoReset done\n");
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}
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