kinit/klauncher_main.cpp

   1 /*
   2   This file is part of the KDE libraries
   3   Copyright (c) 1999 Waldo Bastian <bastian@kde.org>
   4
   5   This library is free software; you can redistribute it and/or
   6   modify it under the terms of the GNU Library General Public
   7   License version 2 as published by the Free Software Foundation.
   8
   9   This library is distributed in the hope that it will be useful,
  10   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12   Library General Public License for more details.
  13
  14   You should have received a copy of the GNU Library General Public License
  15   along with this library; see the file COPYING.LIB.  If not, write to
  16   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17   Boston, MA 02110-1301, USA.
  18 */
  19
  20 #include <config.h>
  21
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24
  25 #include "klauncher.h"
  26 #include <kcomponentdata.h>
  27 #include "kcrash.h"
  28 #include "kdebug.h"
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <signal.h>
  32 #include <klocale.h>
  33 #include <kde_file.h>
  34
  35 #include "klauncher_cmds.h"
  36 #include <QtCore/QCoreApplication>
  37
  38 #ifndef Q_WS_WIN
  39 static int sigpipe[ 2 ];
  40 static void sig_handler(int sig_num)
  41 {
  42    // No recursion
  43    KDE_signal( SIGHUP, SIG_IGN);
  44    KDE_signal( SIGTERM, SIG_IGN);
  45    fprintf(stderr, "klauncher: Exiting on signal %d\n", sig_num);
  46    char tmp = 'x';
  47    write( sigpipe[ 1 ], &tmp, 1 );
  48 }
  49 #endif
  50
  51 extern "C" KDE_EXPORT int kdemain( int argc, char**argv )
  52 {
  53 #ifndef Q_WS_WIN
  54    // Started via kdeinit.
  55    if (fcntl(LAUNCHER_FD, F_GETFD) == -1)
  56    {
  57       fprintf(stderr, "%s", i18n("klauncher: This program is not supposed to be started manually.\n"
  58                                  "klauncher: It is started automatically by kdeinit4.\n").toLocal8Bit().data());
  59       return 1;
  60    }
  61 #endif
  62    KComponentData componentData("klauncher");
  63
  64    // WABA: Make sure not to enable session management.
  65    putenv(strdup("SESSION_MANAGER="));
  66
  67    // Allow the locale to initialize properly
  68    KLocale::setMainCatalog("kdelibs4");
  69
  70    // We need a QCoreApplication to get a DBus event loop
  71    QCoreApplication app(argc, argv);
  72    app.setApplicationName( componentData.componentName() );
  73
  74    int maxTry = 3;
  75    while(true)
  76    {
  77       QString service(QLatin1String("org.kde.klauncher")); // same as ktoolinvocation.cpp
  78       if (!QDBusConnection::sessionBus().isConnected()) {
  79          kWarning() << "No DBUS session-bus found. Check if you have started the DBUS server.";
  80          return 1;
  81       }
  82       QDBusReply<QDBusConnectionInterface::RegisterServiceReply> reply =
  83           QDBusConnection::sessionBus().interface()->registerService(service);
  84       if (!reply.isValid())
  85       {
  86          kWarning() << "DBUS communication problem!";
  87          return 1;
  88       }
  89       if (reply == QDBusConnectionInterface::ServiceRegistered)
  90           break;
  91
  92       if (--maxTry == 0)
  93       {
  94          kWarning() << "Another instance of klauncher is already running!";
  95          return 1;
  96       }
  97
  98       // Wait a bit...
  99       kWarning() << "Waiting for already running klauncher to exit.";
 100       sleep(1);
 101
 102       // Try again...
 103    }
 104
 105    KLauncher *launcher = new KLauncher(LAUNCHER_FD);
 106    QDBusConnection::sessionBus().registerObject("/", launcher);
 107
 108 #ifndef Q_WS_WIN
 109    pipe( sigpipe );
 110    QSocketNotifier* signotif = new QSocketNotifier( sigpipe[ 0 ], QSocketNotifier::Read, launcher );
 111    QObject::connect( signotif, SIGNAL( activated( int )), launcher, SLOT( destruct()));
 112    KCrash::setEmergencySaveFunction(sig_handler);
 113    KDE_signal( SIGHUP, sig_handler);
 114    KDE_signal( SIGPIPE, SIG_IGN);
 115    KDE_signal( SIGTERM, sig_handler);
 116 #endif
 117
 118    return app.exec();
 119 }