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# kcrash.cpp

    00001 /*
    00002  * This file is part of the KDE Libraries
    00003  * Copyright (C) 2000 Timo Hummel <timo.hummel@sap.com>
    00004  *                    Tom Braun <braunt@fh-konstanz.de>
    00005  *
    00006  * This library is free software; you can redistribute it and/or
    00007  * modify it under the terms of the GNU Library General Public
    00008  * License as published by the Free Software Foundation; either
    00009  * version 2 of the License, or (at your option) any later version.
    00010  *
    00011  * This library is distributed in the hope that it will be useful,
    00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00014  * Library General Public License for more details.
    00015  *
    00016  * You should have received a copy of the GNU Library General Public License
    00017  * along with this library; see the file COPYING.LIB.  If not, write to
    00018  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    00019  * Boston, MA 02111-1307, USA.
    00020  */
    00021
    00022 /*
    00023  * This file is used to catch signals which would normally
    00024  * crash the application (like segmentation fault, floating
    00025  * point exception and such).
    00026  */
    00027
    00028 #include <string.h>
    00029 #include <signal.h>
    00030 #include <stdio.h>
    00031 #include <stdlib.h>
    00032 #include <unistd.h>
    00033 #include "kcrash.h"
    00034
    00035 #include <sys/types.h>
    00036 #include <sys/time.h>
    00037 #include <sys/resource.h>
    00038 #include <sys/wait.h>
    00039
    00040 #include <qwindowdefs.h>
    00041 #include <kglobal.h>
    00042 #include <kinstance.h>
    00043 #include <kaboutdata.h>
    00044 #include <kdebug.h>
    00045 #include <kapplication.h>
    00046 #include <dcopclient.h>
    00047
    00048 #ifdef Q_WS_X11
    00049 #include <X11/Xlib.h>
    00050 #endif
    00051
    00052 KCrash::HandlerType KCrash::_emergencySaveFunction = 0;
    00053 KCrash::HandlerType KCrash::_crashHandler = 0;
    00054 const char *KCrash::appName = 0;
    00055 const char *KCrash::appPath = 0;
    00056
    00057 // This function sets the function which should be called when the
    00058 // application crashes and the
    00059 // application is asked to try to save its data.
    00060 void
    00061 KCrash::setEmergencySaveFunction (HandlerType saveFunction)
    00062 {
    00063   _emergencySaveFunction = saveFunction;
    00064
    00065   /*
    00066    * We need at least the default crash handler for
    00067    * emergencySaveFunction to be called
    00068    */
    00069   if (_emergencySaveFunction && !_crashHandler)
    00070     _crashHandler = defaultCrashHandler;
    00071 }
    00072
    00073
    00074 // This function sets the function which should be responsible for
    00075 // the application crash handling.
    00076 void
    00077 KCrash::setCrashHandler (HandlerType handler)
    00078 {
    00079   if (!handler)
    00080     handler = SIG_DFL;
    00081
    00082   sigset_t mask;
    00083   sigemptyset(&mask);
    00084
    00085 #ifdef SIGSEGV
    00086   signal (SIGSEGV, handler);
    00087   sigaddset(&mask, SIGSEGV);
    00088 #endif
    00089 #ifdef SIGFPE
    00090   signal (SIGFPE, handler);
    00091   sigaddset(&mask, SIGFPE);
    00092 #endif
    00093 #ifdef SIGILL
    00094   signal (SIGILL, handler);
    00095   sigaddset(&mask, SIGILL);
    00096 #endif
    00097 #ifdef SIGABRT
    00098   signal (SIGABRT, handler);
    00099   sigaddset(&mask, SIGABRT);
    00100 #endif
    00101
    00102   sigprocmask(SIG_UNBLOCK, &mask, 0);
    00103
    00104   _crashHandler = handler;
    00105 }
    00106
    00107 void
    00108 KCrash::defaultCrashHandler (int sig)
    00109 {
    00110   // WABA: Do NOT use kdDebug() in this function because it is much too risky!
    00111   // Handle possible recursions
    00112   static int crashRecursionCounter = 0;
    00113   crashRecursionCounter++; // Nothing before this, please !
    00114
    00115   signal(SIGALRM, SIG_DFL);
    00116   alarm(3); // Kill me... (in case we deadlock in malloc)
    00117
    00118   if (crashRecursionCounter < 2) {
    00119     if (_emergencySaveFunction) {
    00120       _emergencySaveFunction (sig);
    00121     }
    00122     crashRecursionCounter++; //
    00123   }
    00124
    00125         // Close dcop connections
    00126   DCOPClient::emergencyClose();
    00127   // Close all remaining file descriptors
    00128   struct rlimit rlp;
    00129   getrlimit(RLIMIT_NOFILE, &rlp);
    00130   for (int i = 0; i < (int)rlp.rlim_cur; i++)
    00131     close(i);
    00132
    00133   if (crashRecursionCounter < 3)
    00134   {
    00135     if (appName)
    00136     {
    00137 #ifndef NDEBUG
    00138       fprintf(stderr, "KCrash: crashing... crashRecursionCounter = %d\n", crashRecursionCounter);
    00139       fprintf(stderr, "KCrash: Application Name = %s path = %s pid = %d\n", appName ? appName : "<unknown>" , appPath ? appPath : "<unknown>", getpid());
    00140 #else
    00141       fprintf(stderr, "KCrash: Application '%s' crashing...\n", appName ? appName : "<unknown>");
    00142 #endif
    00143
    00144       pid_t pid = fork();
    00145
    00146       if (pid <= 0) {
    00147         // this code is leaking, but this should not hurt cause we will do a
    00148         // exec() afterwards. exec() is supposed to clean up.
    00149         char * argv[18]; // don't forget to update this
    00150         int i = 0;
    00151
    00152         // argument 0 has to be drkonqi
    00153         argv[i++] = qstrdup("drkonqi");
    00154
    00155         // start up on the correct display
    00156         argv[i++] = qstrdup("-display");
    00157 #ifdef Q_WS_X11
    00158         if ( qt_xdisplay() )
    00159           argv[i++] = XDisplayString(qt_xdisplay());
    00160         else
    00161           argv[i++] = getenv("DISPLAY");
    00162 #elif defined(Q_WS_QWS)
    00163         argv[i++] = getenv("QWS_DISPLAY");
    00164 #endif
    00165
    00166         // we have already tested this
    00167         argv[i++] = qstrdup("--appname");
    00168         argv[i++] = qstrdup(appName);
    00169         if (KApplication::loadedByKdeinit)
    00170           argv[i++] = qstrdup("--kdeinit");
    00171
    00172         // only add apppath if it's not NULL
    00173         if (appPath) {
    00174           argv[i++] = qstrdup("--apppath");
    00175           argv[i++] = qstrdup(appPath);
    00176         }
    00177
    00178         // signal number -- will never be NULL
    00179         QCString tmp;
    00180         tmp.setNum(sig);
    00181         argv[i++] = qstrdup("--signal");
    00182         argv[i++] = qstrdup(tmp.data());
    00183
    00184         // pid number -- only include if this is the child
    00185         // the debug stuff will be disabled if we was not able to fork
    00186         if (pid == 0) {
    00187           tmp.setNum(getppid());
    00188           argv[i++] = qstrdup("--pid");
    00189           argv[i++] = qstrdup(tmp.data());
    00190         }
    00191
    00192         const KInstance *instance = KGlobal::_instance;
    00193         const KAboutData *about = instance ? instance->aboutData() : 0;
    00194         if (about) {
    00195           if (!about->version().isNull()) {
    00196             argv[i++] = qstrdup("--appversion");
    00197             argv[i++] = qstrdup(about->version().utf8());
    00198           }
    00199
    00200           if (!about->programName().isNull()) {
    00201             argv[i++] = qstrdup("--programname");
    00202             argv[i++] = qstrdup(about->programName().utf8());
    00203           }
    00204
    00205           if (!about->bugAddress().isNull()) {
    00206             argv[i++] = qstrdup("--bugaddress");
    00207             argv[i++] = qstrdup(about->bugAddress().utf8());
    00208           }
    00209         }
    00210
    00211         if ( kapp && !kapp->startupId().isNull()) {
    00212             argv[i++] = qstrdup("--startupid");
    00213             argv[i++] = qstrdup(kapp->startupId());
    00214         }
    00215
    00216         // NULL terminated list
    00217         argv[i++] = NULL;
    00218
    00219         setgid(getgid());
    00220         setuid(getuid());
    00221
    00222         execvp("drkonqi", argv);
    00223
    00224         // we could clean up here
    00225         // i = 0;
    00226         // while (argv[i])
    00227         //   free(argv[i++]);
    00228       }
    00229       else
    00230       {
    00231
    00232         alarm(0); // Seems we made it....
    00233
    00234         // wait for child to exit
    00235         waitpid(pid, NULL, 0);
    00236         _exit(253);
    00237       }
    00238     }
    00239     else {
    00240       fprintf(stderr, "Unknown appname\n");
    00241     }
    00242   }
    00243
    00244   if (crashRecursionCounter < 4)
    00245   {
    00246      fprintf(stderr, "Unable to start Dr. Konqi\n");
    00247   }
    00248   _exit(255);
    00249 }

This file is part of the documentation for kdelibs Version 3.1.5.
Documentation copyright © 1996-2002 the KDE developers.
Generated on Wed Jan 28 12:46:25 2004 by doxygen 1.3.4 written by Dimitri van Heesch, © 1997-2001