KDECore

kxerrorhandler.cpp

00001 /*
00002 
00003   Copyright (c) 2003 Lubos Lunak <l.lunak@kde.org>
00004 
00005   Permission is hereby granted, free of charge, to any person obtaining a
00006   copy of this software and associated documentation files (the "Software"),
00007   to deal in the Software without restriction, including without limitation
00008   the rights to use, copy, modify, merge, publish, distribute, sublicense,
00009   and/or sell copies of the Software, and to permit persons to whom the
00010   Software is furnished to do so, subject to the following conditions:
00011 
00012   The above copyright notice and this permission notice shall be included in
00013   all copies or substantial portions of the Software.
00014 
00015   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00016   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00017   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
00018   THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00019   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
00020   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
00021   DEALINGS IN THE SOFTWARE.
00022 
00023 */
00024 
00025 #include <qwidget.h>
00026 #ifdef Q_WS_X11 //FIXME
00027 
00028 #include "kxerrorhandler.h"
00029 #include <assert.h>
00030 #include <stdlib.h>
00031 #include <netwm_def.h>
00032 
00033 KXErrorHandler** KXErrorHandler::handlers = NULL;
00034 int KXErrorHandler::pos = 0;
00035 int KXErrorHandler::size = 0;
00036     
00037 KXErrorHandler::KXErrorHandler( Display* dpy )
00038     :   user_handler1( NULL ),
00039         user_handler2( NULL ),
00040         old_handler( XSetErrorHandler( handler_wrapper )),
00041         first_request( XNextRequest( dpy )),
00042         display( dpy ),
00043         was_error( false )
00044     {
00045     addHandler();
00046     }
00047 
00048 KXErrorHandler::KXErrorHandler( bool (*handler)( int request, int error_code, unsigned long resource_id ), Display* dpy )
00049     :   user_handler1( handler ),
00050         user_handler2( NULL ),
00051         old_handler( XSetErrorHandler( handler_wrapper )),
00052         first_request( XNextRequest( dpy )),
00053         display( dpy ),
00054         was_error( false )
00055     {
00056     addHandler();
00057     }
00058 
00059 KXErrorHandler::KXErrorHandler( int (*handler)( Display*, XErrorEvent* ), Display* dpy )
00060     :   user_handler1( NULL ),
00061         user_handler2( handler ),
00062         old_handler( XSetErrorHandler( handler_wrapper )),
00063         first_request( XNextRequest( dpy )),
00064         display( dpy ),
00065         was_error( false )
00066     {
00067     addHandler();
00068     }
00069 
00070 KXErrorHandler::~KXErrorHandler()
00071     {
00072     XSetErrorHandler( old_handler );
00073     assert( this == handlers[ pos - 1 ] ); // destroy in reverse order
00074     --pos;
00075     }
00076 
00077 void KXErrorHandler::addHandler()
00078     {
00079     if( size == pos )
00080         {
00081         size += 16;
00082         handlers = static_cast< KXErrorHandler** >( realloc( handlers, size * sizeof( KXErrorHandler* )));
00083         }
00084     handlers[ pos++ ] = this;
00085     }
00086 
00087 bool KXErrorHandler::error( bool sync ) const
00088     {
00089     if( sync )
00090         XSync( display, False );
00091     return was_error;
00092     }
00093     
00094 int KXErrorHandler::handler_wrapper( Display* dpy, XErrorEvent* e )
00095     {
00096     --pos;
00097     int ret = handlers[ pos ]->handle( dpy, e );
00098     ++pos;
00099     return ret;
00100     }
00101 
00102 int KXErrorHandler::handle( Display* dpy, XErrorEvent* e )
00103     {
00104     if( dpy == display
00105         // e->serial >= first_request , compare like X timestamps to handle wrapping
00106         && NET::timestampCompare( e->serial, first_request ) >= 0 )
00107         { // it's for us
00108         //qDebug( "Handling: %p", static_cast< void* >( this ));
00109         if( user_handler1 != NULL && user_handler1( e->request_code, e->error_code, e->resourceid ))
00110             was_error = true;
00111         if( user_handler2 != NULL && user_handler2( dpy, e ) != 0 )
00112             was_error = true;
00113         else // no handler set, simply set that there was an error
00114             was_error = true;
00115         return 0;
00116         }
00117     //qDebug( "Going deeper: %p", static_cast< void* >( this ));
00118     return old_handler( dpy, e );
00119     }
00120 
00121 #endif
KDECore

kxerrorhandler.cpp

KDECore

API Reference
