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112 lines
2.9 KiB
112 lines
2.9 KiB
/*
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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 COPYRIGHT HOLDERS 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 a copyright holder 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 copyright holder.
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*/
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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 *dspl ATTR_UNUSED, XErrorEvent *event ATTR_UNUSED )
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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( Window window )
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{
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Window root, parent, *children;
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unsigned int child, 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 %p\n", 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 void
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abortReset( int n ATTR_UNUSED )
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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()
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{
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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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killWindows( RootWindow( dpy, screen ) );
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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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