/* Copyright 1988, 1998 The Open Group Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. 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 COPYRIGHT HOLDERS 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 a copyright holder 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 copyright holder. */ /* * xdm - display manager daemon * 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 "dm_error.h" #include <X11/Xlib.h> #include <signal.h> /*ARGSUSED*/ static int ignoreErrors( Display *dspl ATTR_UNUSED, XErrorEvent *event ATTR_UNUSED ) { Debug( "ignoring error\n" ); return 0; } /* * 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 void killWindows( Window window ) { Window root, parent, *children; unsigned int child, nchildren = 0; while (XQueryTree( dpy, window, &root, &parent, &children, &nchildren ) && nchildren > 0) { for (child = 0; child < nchildren; child++) { Debug( "XKillClient %p\n", children[child] ); XKillClient( dpy, children[child] ); } XFree( (char *)children ); } } static Jmp_buf resetJmp; /* ARGSUSED */ static void abortReset( int n ATTR_UNUSED ) { Longjmp( resetJmp, 1 ); } /* * this display connection better not have any windows... */ void pseudoReset() { 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 ); killWindows( RootWindow( dpy, screen ) ); } Debug( "before XSync\n" ); XSync( dpy, False ); (void)alarm( 0 ); } Signal( SIGALRM, SIG_DFL ); XSetErrorHandler( (XErrorHandler)0 ); Debug( "pseudoReset done\n" ); }