workspace/ksmserver/main.cpp

   1 /*****************************************************************
   2 ksmserver - the KDE session management server
   3
   4 Copyright 2000 Matthias Ettrich <ettrich@kde.org>
   5
   6 Permission is hereby granted, free of charge, to any person obtaining a copy
   7 of this software and associated documentation files (the "Software"), to deal
   8 in the Software without restriction, including without limitation the rights
   9 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 copies of the Software, and to permit persons to whom the Software is
  11 furnished to do so, subject to the following conditions:
  12
  13 The above copyright notice and this permission notice shall be included in
  14 all copies or substantial portions of the Software.
  15
  16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  19 AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  20 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22
  23 ******************************************************************/
  24 #include <fixx11h.h>
  25 #include <config-workspace.h>
  26 #include <config-ksmserver.h>
  27 #include <unistd.h>
  28 #include <stdlib.h>
  29 #include <fcntl.h>
  30 #include <errno.h>
  31 #include <string.h>
  32
  33 #include <KMessageBox>
  34 #include <QtDBus/QtDBus>
  35
  36 #include <kapplication.h>
  37 #include <kcmdlineargs.h>
  38 #include <kconfiggroup.h>
  39 #include <kaboutdata.h>
  40 #include <kdebug.h>
  41 #include <klocale.h>
  42 #include <kglobal.h>
  43 #include <kconfig.h>
  44 #include <kmanagerselection.h>
  45 #include <kwindowsystem.h>
  46 #include "server.h"
  47 #include <QX11Info>
  48
  49 #include <X11/extensions/Xrender.h>
  50
  51 static const char version[] = "0.4";
  52 static const char description[] = I18N_NOOP( "The reliable KDE session manager that talks the standard X11R6 \nsession management protocol (XSMP)." );
  53
  54 Display* dpy = 0;
  55 Colormap colormap = 0;
  56 Visual *visual = 0;
  57
  58 extern KSMServer* the_server;
  59
  60 void IoErrorHandler ( IceConn iceConn)
  61 {
  62     the_server->ioError( iceConn );
  63 }
  64
  65 bool writeTest(QByteArray path)
  66 {
  67    path += "/XXXXXX";
  68    int fd = mkstemp(path.data());
  69    if (fd == -1)
  70       return false;
  71    if (write(fd, "Hello World\n", 12) == -1)
  72    {
  73       int save_errno = errno;
  74       close(fd);
  75       unlink(path.data());
  76       errno = save_errno;
  77       return false;
  78    }
  79    close(fd);
  80    unlink(path.data());
  81    return true;
  82 }
  83
  84 void checkComposite()
  85 {
  86     if( qgetenv( "KDE_SKIP_ARGB_VISUALS" ) == "1" )
  87         return;
  88     // thanks to zack rusin and frederik for pointing me in the right direction
  89     // for the following bits of X11 code
  90     dpy = XOpenDisplay(0); // open default display
  91     if (!dpy)
  92     {
  93         kError() << "Cannot connect to the X server";
  94         return;
  95     }
  96
  97     int screen = DefaultScreen(dpy);
  98     int eventBase, errorBase;
  99
 100     if (XRenderQueryExtension(dpy, &eventBase, &errorBase))
 101     {
 102         int nvi;
 103         XVisualInfo templ;
 104         templ.screen  = screen;
 105         templ.depth   = 32;
 106         templ.c_class = TrueColor;
 107         XVisualInfo *xvi = XGetVisualInfo(dpy, VisualScreenMask |
 108                                                 VisualDepthMask |
 109                                                 VisualClassMask,
 110                                             &templ, &nvi);
 111         for (int i = 0; i < nvi; ++i)
 112         {
 113             XRenderPictFormat *format = XRenderFindVisualFormat(dpy,
 114                                                                 xvi[i].visual);
 115             if (format->type == PictTypeDirect && format->direct.alphaMask)
 116             {
 117                 visual = xvi[i].visual;
 118                 colormap = XCreateColormap(dpy, RootWindow(dpy, screen),
 119                                             visual, AllocNone);
 120                 return;
 121             }
 122         }
 123
 124     }
 125     XCloseDisplay( dpy );
 126     dpy = NULL;
 127 }
 128
 129 void sanity_check( int argc, char* argv[], KAboutData* aboutDataPtr )
 130 {
 131     QString msg;
 132     QByteArray path = getenv("HOME");
 133     QByteArray readOnly = getenv("KDE_HOME_READONLY");
 134     if (path.isEmpty())
 135     {
 136         msg = QLatin1String("$HOME not set!");
 137     }
 138     if (msg.isEmpty() && access(path.data(), W_OK))
 139     {
 140         if (errno == ENOENT)
 141             msg = QLatin1String("$HOME directory (%1) does not exist.");
 142         else if (readOnly.isEmpty())
 143             msg = QLatin1String("No write access to $HOME directory (%1).");
 144     }
 145     if (msg.isEmpty() && access(path.data(), R_OK))
 146     {
 147         if (errno == ENOENT)
 148             msg = "$HOME directory (%1) does not exist.";
 149         else
 150             msg = "No read access to $HOME directory (%1).";
 151     }
 152     if (msg.isEmpty() && readOnly.isEmpty() && !writeTest(path))
 153     {
 154         if (errno == ENOSPC)
 155             msg = "$HOME directory (%1) is out of disk space.";
 156         else
 157             msg = QByteArray("Writing to the $HOME directory (%1) failed with\n    "
 158                 "the error '")+QByteArray(strerror(errno))+QByteArray("'");
 159     }
 160     if (msg.isEmpty())
 161     {
 162         path = getenv("ICEAUTHORITY");
 163         if (path.isEmpty())
 164         {
 165             path = getenv("HOME");
 166             path += "/.ICEauthority";
 167         }
 168
 169         if (access(path.data(), W_OK) && (errno != ENOENT))
 170             msg = "No write access to '%1'.";
 171         else if (access(path.data(), R_OK) && (errno != ENOENT))
 172             msg = "No read access to '%1'.";
 173     }
 174     if (msg.isEmpty())
 175     {
 176 #ifdef __GNUC__
 177 #warning Is something like this needed for D-BUS?
 178 #endif
 179 #if 0
 180     path = DCOPClient::dcopServerFile();
 181     if (access(path.data(), R_OK) && (errno == ENOENT))
 182     {
 183         // Check iceauth
 184         if (DCOPClient::iceauthPath().isEmpty())
 185             msg = "Could not find 'iceauth' in path.";
 186     }
 187 #endif
 188     }
 189     if (msg.isEmpty())
 190     {
 191         path = getenv("KDETMP");
 192         if (path.isEmpty())
 193             path = "/tmp";
 194         if (!writeTest(path))
 195         {
 196             if (errno == ENOSPC)
 197             msg = "Temp directory (%1) is out of disk space.";
 198             else
 199             msg = "Writing to the temp directory (%1) failed with\n    "
 200                     "the error '"+QByteArray(strerror(errno))+QByteArray("'");
 201         }
 202     }
 203     if (msg.isEmpty() && (path != "/tmp"))
 204     {
 205         path = "/tmp";
 206         if (!writeTest(path))
 207         {
 208             if (errno == ENOSPC)
 209             msg = "Temp directory (%1) is out of disk space.";
 210             else
 211             msg = "Writing to the temp directory (%1) failed with\n    "
 212                     "the error '"+QByteArray(strerror(errno))+QByteArray("'");
 213         }
 214     }
 215     if (msg.isEmpty())
 216     {
 217         path += "/.ICE-unix";
 218         if (access(path.data(), W_OK) && (errno != ENOENT))
 219             msg = "No write access to '%1'.";
 220         else if (access(path.data(), R_OK) && (errno != ENOENT))
 221             msg = "No read access to '%1'.";
 222     }
 223     if (!msg.isEmpty())
 224     {
 225         const char *msg_pre =
 226                 "The following installation problem was detected\n"
 227                 "while trying to start KDE:"
 228                 "\n\n    ";
 229         const char *msg_post = "\n\nKDE is unable to start.\n";
 230         fputs(msg_pre, stderr);
 231         fprintf(stderr, "%s", qPrintable(msg.arg(QFile::decodeName(path))));
 232         fputs(msg_post, stderr);
 233
 234         QApplication a(argc, argv);
 235         KComponentData i(aboutDataPtr);
 236         QString qmsg = msg_pre+msg.arg(QFile::decodeName(path))+msg_post;
 237         KMessageBox::error(0, qmsg, "KDE Installation Problem!");
 238         exit(255);
 239     }
 240 }
 241
 242 extern "C" KDE_EXPORT int kdemain( int argc, char* argv[] )
 243 {
 244     KAboutData aboutData( "ksmserver", 0, ki18n("The KDE Session Manager"),
 245        version, ki18n(description), KAboutData::License_BSD,
 246        ki18n("(C) 2000, The KDE Developers"));
 247     aboutData.addAuthor(ki18n("Matthias Ettrich"),KLocalizedString(), "ettrich@kde.org");
 248     aboutData.addAuthor(ki18n("Luboš Luňák"), ki18n( "Maintainer" ), "l.lunak@kde.org" );
 249
 250     sanity_check(argc, argv, &aboutData);
 251
 252     KCmdLineArgs::init(argc, argv, &aboutData);
 253
 254     KCmdLineOptions options;
 255     options.add("r");
 256     options.add("restore", ki18n("Restores the saved user session if available"));
 257     options.add("w");
 258     options.add("windowmanager <wm>", ki18n("Starts 'wm' in case no other window manager is \nparticipating in the session. Default is 'kwin'"));
 259     options.add("nolocal", ki18n("Also allow remote connections"));
 260     KCmdLineArgs::addCmdLineOptions( options );
 261
 262     putenv((char*)"SESSION_MANAGER=");
 263     checkComposite();
 264     KApplication *a;
 265
 266     if( dpy != NULL && DefaultDepth(dpy, DefaultScreen(dpy)) >= 24) // 16bpp breaks the software logout effect for some reason???
 267         a = new KApplication(dpy, visual ? Qt::HANDLE(visual) : 0, colormap ? Qt::HANDLE(colormap) : 0);
 268     else
 269         a = new KApplication(true);
 270     fcntl(ConnectionNumber(QX11Info::display()), F_SETFD, 1);
 271
 272     a->setQuitOnLastWindowClosed(false); // #169486
 273
 274     KCmdLineArgs *args = KCmdLineArgs::parsedArgs();
 275
 276     if( !QDBusConnection::sessionBus().interface()->registerService( "org.kde.ksmserver", QDBusConnectionInterface::DontQueueService ) )
 277     {
 278         qWarning("Could not register with D-BUS. Aborting.");
 279         return 1;
 280     }
 281
 282     QString wm = args->getOption("windowmanager");
 283
 284     bool only_local = args->isSet("local");
 285 #ifndef HAVE__ICETRANSNOLISTEN
 286     /* this seems strange, but the default is only_local, so if !only_local
 287      * the option --nolocal was given, and we warn (the option --nolocal
 288      * does nothing on this platform, as here the default is reversed)
 289      */
 290     if (!only_local) {
 291         qWarning("--[no]local is not supported on your platform. Sorry.");
 292     }
 293     only_local = false;
 294 #endif
 295
 296     KSMServer *server = new KSMServer( wm, only_local);
 297
 298     // for the KDE-already-running check in startkde
 299     KSelectionOwner kde_running( "_KDE_RUNNING", 0 );
 300     kde_running.claim( false );
 301
 302     IceSetIOErrorHandler( IoErrorHandler );
 303
 304     KConfigGroup config(KGlobal::config(), "General");
 305
 306     int realScreenCount = ScreenCount( QX11Info::display() );
 307     bool screenCountChanged =
 308          ( config.readEntry( "screenCount", realScreenCount ) != realScreenCount );
 309
 310     QString loginMode = config.readEntry( "loginMode", "restorePreviousLogout" );
 311
 312     if ( args->isSet("restore") && ! screenCountChanged )
 313         server->restoreSession( SESSION_BY_USER );
 314     else if ( loginMode == "default" || screenCountChanged )
 315         server->startDefaultSession();
 316     else if ( loginMode == "restorePreviousLogout" )
 317         server->restoreSession( SESSION_PREVIOUS_LOGOUT );
 318     else if ( loginMode == "restoreSavedSession" )
 319         server->restoreSession( SESSION_BY_USER );
 320     else
 321         server->startDefaultSession();
 322     int ret = a->exec();
 323     kde_running.release(); // needs to be done before QApplication destruction
 324     delete a;
 325     return ret;
 326 }