replaced the simple fork and execv method of starting applications with a

more sophisticated method (mostly taken from K/OProcess, because we can't
use libopie in libqpe).
We can detect now, if apps can not be started.

1 files changed, 54 insertions, 11 deletions

diff --git a/library/global.cpp b/library/global.cpp
index d6ba84f..68a3a75 100644
--- a/library/global.cpp
+++ b/library/global.cpp
@@ -1,300 +1,301 @@
 /**********************************************************************
 ** Copyright (C) 2000-2002 Trolltech AS.  All rights reserved.
 **
 ** This file is part of the Qtopia Environment.
 **
 ** This file may be distributed and/or modified under the terms of the
 ** GNU General Public License version 2 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.GPL included in the
 ** packaging of this file.
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ** See http://www.trolltech.com/gpl/ for GPL licensing information.
 **
 ** Contact info@trolltech.com if any conditions of this licensing are
 ** not clear to you.
 **
 **********************************************************************/
 #define QTOPIA_INTERNAL_LANGLIST
 #include <qpe/qpedebug.h>
 #include <qpe/global.h>
 #include <qpe/qdawg.h>
 #include <qpe/qpeapplication.h>
 #include <qpe/resource.h>
 #include <qpe/storage.h>
 #include <qpe/applnk.h>
 #include <qpe/qcopenvelope_qws.h>
 
 #include <qfile.h>
 #include <qlabel.h>
 #include <qtimer.h>
 #include <qmap.h>
 #include <qdict.h>
 #include <qdir.h>
 #include <qmessagebox.h>
 #include <qregexp.h>
 
 #include <stdlib.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <sys/types.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <errno.h>
 
 #include <qwindowsystem_qws.h> // for qwsServer
 #include <qdatetime.h>
 
 #include <qfile.h>
 
 namespace {
   // checks if the storage should be searched
   bool checkStorage(const QString &path ){ // this is a small Config replacement cause config is too limited -zecke
     QFile file(path );
     if(!file.open(IO_ReadOnly ) )
        return true;
 
     QByteArray array = file.readAll();
     QStringList list = QStringList::split('\n', QString( array ) );
     for(QStringList::Iterator it = list.begin(); it != list.end(); ++it ){
       if( (*it).startsWith("autocheck = 0" ) ){
         return false;
       }else if( (*it).startsWith("autocheck = 1" ) ){
         return true;
       }
     }
     return true;
   }
 }
 
 //#include "quickexec_p.h"
 
 class Emitter : public QObject {
     Q_OBJECT
 public:
     Emitter( QWidget* receiver, const QString& document )
     {
         connect(this, SIGNAL(setDocument(const QString&)),
             receiver, SLOT(setDocument(const QString&)));
         emit setDocument(document);
         disconnect(this, SIGNAL(setDocument(const QString&)),
                receiver, SLOT(setDocument(const QString&)));
     }
 
 signals:
     void setDocument(const QString&);
 };
 
 
 class StartingAppList : public QObject {
     Q_OBJECT
 public:
     static void add( const QString& name );
     static bool isStarting( const QString name );
 private slots:
     void handleNewChannel( const QString &);
 private:
     StartingAppList( QObject *parent=0, const char* name=0 ) ;
 
     QDict<QTime> dict;
     static StartingAppList *appl;
 };
 
 StartingAppList* StartingAppList::appl = 0;
 
 StartingAppList::StartingAppList( QObject *parent, const char* name )
     :QObject( parent, name )
 {
 #if QT_VERSION >= 232 && defined(QWS)
     connect( qwsServer, SIGNAL( newChannel(const QString&)),
              this, SLOT( handleNewChannel(const QString&)) );
         #endif     
     dict.setAutoDelete( TRUE );
 }
 
 void StartingAppList::add( const QString& name )
 {
 #if QT_VERSION >= 232  && !defined(QT_NO_COP)
     if ( !appl )
         appl = new StartingAppList;
     QTime *t = new QTime;
     t->start();
     appl->dict.insert( "QPE/Application/" + name, t );
 #endif
 }
 
 bool StartingAppList::isStarting( const QString name )
 {
 #if QT_VERSION >= 232  && !defined(QT_NO_COP)
     if ( appl ) {
         QTime *t  = appl->dict.find( "QPE/Application/" + name );
         if ( !t )
             return FALSE;
         if ( t->elapsed() > 10000 ) {
             // timeout in case of crash or something
             appl->dict.remove( "QPE/Application/" + name );
             return FALSE;
         }
         return TRUE;
     }
 #endif
     return FALSE;
 }
 
 void StartingAppList::handleNewChannel( const QString & name )
 {
 #if QT_VERSION >= 232  && !defined(QT_NO_COP)
     dict.remove( name );
 #endif
 }
 
 static bool docDirCreated = FALSE;
 static QDawg* fixed_dawg = 0;
 static QDict<QDawg> *named_dawg = 0;
 
 static QString qpeDir()
 {
     QString dir = getenv("OPIEDIR");
     if ( dir.isEmpty() ) dir = "..";
     return dir;
 }
 
 static QString dictDir()
 {
     return qpeDir() + "/etc/dict";
 }
 
 /*!
   \class Global global.h
   \brief The Global class provides application-wide global functions.
 
   The Global functions are grouped as follows:
   \tableofcontents
 
   \section1 User Interface
 
   The statusMessage() function provides short-duration messages to the
   user. The showInputMethod() function shows the current input method,
   and hideInputMethod() hides the input method.
 
   \section1 Document related
 
   The findDocuments() function creates a set of \link doclnk.html
   DocLnk\endlink objects in a particular folder.
 
   \section1 Filesystem related
 
   Global provides an applicationFileName() function that returns the
   full path of an application-specific file.
 
   The execute() function runs an application.
 
   \section1 Word list related
 
   A list of words relevant to the current locale is maintained by the
   system. The list is held in a \link qdawg.html DAWG\endlink
   (implemented by the QDawg class). This list is used, for example, by
   the pickboard input method.
 
   The global QDawg is returned by fixedDawg(); this cannot be updated.
   An updatable copy of the global QDawg is returned by addedDawg().
   Applications may have their own word lists stored in \l{QDawg}s
   which are returned by dawg(). Use addWords() to add words to the
   updateable copy of the global QDawg or to named application
   \l{QDawg}s.
 
   \section1 Quoting
 
   The shellQuote() function quotes a string suitable for passing to a
   shell. The stringQuote() function backslash escapes '\' and '"'
   characters.
 
   \section1 Hardware
 
   The writeHWClock() function sets the hardware clock to the system
   clock's date and time.
 
   \ingroup qtopiaemb
 */
 
 /*!
   \internal
 */
 Global::Global()
 {
 }
 
 /*!
   Returns the unchangeable QDawg that contains general
   words for the current locale.
 
   \sa addedDawg()
 */
 const QDawg& Global::fixedDawg()
 {
     if ( !fixed_dawg ) {
         if ( !docDirCreated )
             createDocDir();
 
         fixed_dawg = new QDawg;
         QString dawgfilename = dictDir() + "/dawg";
         QString words_lang;
         QStringList langs = Global::languageList();
         for (QStringList::ConstIterator it = langs.begin(); it!=langs.end(); ++it) {
             QString lang = *it;
             words_lang = dictDir() + "/words." + lang;
             QString dawgfilename_lang = dawgfilename + "." + lang;
             if ( QFile::exists(dawgfilename_lang) ||
                  QFile::exists(words_lang) ) {
                 dawgfilename = dawgfilename_lang;
                 break;
             }
         }
         QFile dawgfile(dawgfilename);
 
         if ( !dawgfile.exists() ) {
             QString fn = dictDir() + "/words";
             if ( QFile::exists(words_lang) )
                 fn = words_lang;
             QFile in(fn);
             if ( in.open(IO_ReadOnly) ) {
                 fixed_dawg->createFromWords(&in);
                 dawgfile.open(IO_WriteOnly);
                 fixed_dawg->write(&dawgfile);
                 dawgfile.close();
             }
         } else {
             fixed_dawg->readFile(dawgfilename);
         }
     }
 
     return *fixed_dawg;
 }
 
 /*!
   Returns the changeable QDawg that contains general
   words for the current locale.
 
   \sa fixedDawg()
 */
 const QDawg& Global::addedDawg()
 {
     return dawg("local");
 }
 
 /*!
   Returns the QDawg with the given \a name.
   This is an application-specific word list.
 
   \a name should not contain "/".
 */
 const QDawg& Global::dawg(const QString& name)
 {
     createDocDir();
     if ( !named_dawg )
         named_dawg = new QDict<QDawg>;
     QDawg* r = named_dawg->find(name);
     if ( !r ) {
         r = new QDawg;
         named_dawg->insert(name,r);
@@ -350,457 +351,499 @@ void Global::addWords(const QString& dictname, const QStringList& wordlist)
   Returns the full path for the application called \a appname, with the
   given \a filename. Returns QString::null if there was a problem creating
   the directory tree for \a appname.
   If \a filename contains "/", it is the caller's responsibility to
   ensure that those directories exist.
 */
 QString Global::applicationFileName(const QString& appname, const QString& filename)
 {
     QDir d;
     QString r = getenv("HOME");
     r += "/Applications/";
     if ( !QFile::exists( r ) )
         if ( d.mkdir(r) == false )
             return QString::null;
     r += appname;
     if ( !QFile::exists( r ) )
         if ( d.mkdir(r) == false )
             return QString::null;
     r += "/"; r += filename;
     return r;
 }
 
 /*!
   \internal
 */
 void Global::createDocDir()
 {
     if ( !docDirCreated ) {
         docDirCreated = TRUE;
         mkdir( QPEApplication::documentDir().latin1(), 0755 );
     }
 }
 
 
 /*!
   Displays a status \a message to the user. This usually appears
   in the taskbar for a short amount of time, then disappears.
 */
 void Global::statusMessage(const QString& message)
 {
 #if!defined(QT_NO_COP)
     QCopEnvelope e( "QPE/TaskBar", "message(QString)" );
     e << message;
 #endif
 }
 
 /*!
   \internal
 */
 void Global::applyStyle()
 {
 #if !defined(QT_NO_COP)
     QCopChannel::send( "QPE/System", "applyStyle()" );
 #else
     ((QPEApplication *)qApp)->applyStyle(); // apply without needing QCop for floppy version
 #endif
 }
 
 /*!
   \internal
 */
 QWidget *Global::shutdown( bool )
 {
 #if !defined(QT_NO_COP)
     QCopChannel::send( "QPE/System", "shutdown()" );
 #endif
     return 0;
 }
 
 /*!
   \internal
 */
 QWidget *Global::restart( bool )
 {
 #if !defined(QT_NO_COP)
     QCopChannel::send( "QPE/System", "restart()" );
 #endif
     return 0;
 }
 
 /*!
   Explicitly show the current input method.
 
   Input methods are indicated in the taskbar by a small icon. If the
   input method is activated (shown) then it takes up some proportion
   of the bottom of the screen, to allow the user to interact (input
   characters) with it.
 
   \sa hideInputMethod()
 */
 void Global::showInputMethod()
 {
 #if !defined(QT_NO_COP)
     QCopChannel::send( "QPE/TaskBar", "showInputMethod()" );
 #endif
 }
 
 /*!
   Explicitly hide the current input method.
 
   The current input method is still indicated in the taskbar, but no
   longer takes up screen space, and can no longer be interacted with.
 
   \sa showInputMethod()
 */
 void Global::hideInputMethod()
 {
 #if !defined(QT_NO_COP)
     QCopChannel::send( "QPE/TaskBar", "hideInputMethod()" );
 #endif
 }
 
 
 /*!
   \internal
 */
 bool Global::isBuiltinCommand( const QString &name )
 {
     if(!builtin)
         return FALSE; // yes, it can happen
     for (int i = 0; builtin[i].file; i++) {
         if ( builtin[i].file == name ) {
             return TRUE;
         }
     }
     return FALSE;
 }
 
 Global::Command* Global::builtin=0;
 QGuardedPtr<QWidget> *Global::running=0;
 
 /*!
   \class Global::Command
   \brief The Global::Command class is internal.
   \internal
 */
 
 /*!
   \internal
 */
 void Global::setBuiltinCommands( Command* list )
 {
     if ( running )
         delete [] running;
 
     builtin = list;
     int count = 0;
     if (!builtin)
         return;
     while ( builtin[count].file )
         count++;
 
     running = new QGuardedPtr<QWidget> [ count ];
 }
 
 /*!
   \internal
 */
 void Global::setDocument( QWidget* receiver, const QString& document )
 {
     Emitter emitter(receiver,document);
 }
 
 /*!
   \internal
 */
 bool Global::terminateBuiltin( const QString& n )
 {
     if (!builtin)
         return FALSE;
     for (int i = 0; builtin[i].file; i++) {
         if ( builtin[i].file == n ) {
             delete running[i];
             return TRUE;
         }
     }
     return FALSE;
 }
 
 /*!
   \internal
 */
 void Global::terminate( const AppLnk* app )
 {
     //if ( terminateBuiltin(app->exec()) ) return; // maybe? haven't tried this
 
 #ifndef QT_NO_COP
     QCString channel = "QPE/Application/" + app->exec().utf8();
     if ( QCopChannel::isRegistered(channel) ) {
         QCopEnvelope e(channel, "quit()");
     }
 #endif
 }
 
 /*!
   Low-level function to run command \a c.
 
   \warning Do not use this function. Use execute instead.
 
   \sa execute()
 */
 void Global::invoke(const QString &c)
 {
     // Convert the command line in to a list of arguments
     QStringList list = QStringList::split(QRegExp("  *"),c);
 
 #if !defined(QT_NO_COP)
     QString ap=list[0];
     // see if the application is already running
     // XXX should lock file /tmp/qcop-msg-ap
     if ( QCopChannel::isRegistered( ("QPE/Application/" + ap).latin1() ) ) {
         // If the channel is already register, the app is already running, so show it.
         { QCopEnvelope env( ("QPE/Application/" + ap).latin1(), "raise()" ); }
                 
         QCopEnvelope e("QPE/System", "notBusy(QString)" );
         e << ap;
         return;
     }
     // XXX should unlock file /tmp/qcop-msg-ap
     //see if it is being started
     if ( StartingAppList::isStarting( ap ) ) {
         QCopEnvelope e("QPE/System", "notBusy(QString)" );
         e << ap;
         return;
     }
 
 #endif
 
 #ifdef QT_NO_QWS_MULTIPROCESS
     QMessageBox::warning( 0, "Error", "Could not find the application " + c, "Ok", 0, 0, 0, 1 );
 #else
 
     QStrList slist;
     unsigned int j;
     for ( j = 0; j < list.count(); j++ )
         slist.append( list[j].utf8() );
 
     const char **args = new (const char *)[slist.count() + 1];
     for ( j = 0; j < slist.count(); j++ )
         args[j] = slist.at(j);
     args[j] = NULL;
 
 #if !defined(QT_NO_COP)
     // an attempt to show a wait...
     // more logic should be used, but this will be fine for the moment...
     QCopEnvelope ( "QPE/System", "busy()" );
 #endif
 
 #ifdef HAVE_QUICKEXEC
     QString libexe = qpeDir()+"/binlib/lib"+args[0] + ".so";
     qDebug("libfile = %s", libexe.latin1() );
     if ( QFile::exists( libexe ) ) {
         qDebug("calling quickexec %s", libexe.latin1() );
         quickexecv( libexe.utf8().data(), (const char **)args );
     } else
 #endif
-            {    
-        if ( !::vfork() ) {
-            for ( int fd = 3; fd < 100; fd++ )
-                ::close( fd );
-            ::setpgid( ::getpid(), ::getppid() );
-            // Try bindir first, so that foo/bar works too
-            ::execv( qpeDir()+"/bin/"+args[0], (char * const *)args );
-            ::execvp( args[0], (char * const *)args );
-            _exit( -1 );
-        }
+    {           
+        bool success = false; 
+        int pfd [2];
+        if ( ::pipe ( pfd ) < 0 )
+            pfd [0] = pfd [1] = -1;
+    
+        pid_t pid = ::fork ( );
+        
+        if ( pid == 0 ) { // child
+            for ( int fd = 3; fd < 100; fd++ ) {
+                if ( fd != pfd [1] )
+                    ::close ( fd );
+            }
+            ::setpgid ( ::getpid ( ), ::getppid ( ));
+
+            // Closing of fd[1] indicates that the execvp succeeded!
+            if ( pfd [1] >= 0 )
+                ::fcntl ( pfd [1], F_SETFD, FD_CLOEXEC );
+             
+            // Try bindir first, so that foo/bar works too
+            ::execv ( qpeDir ( ) + "/bin/" + args [0], (char * const *) args );
+            ::execvp ( args [0], (char * const *) args );
+            
+            char resultByte = 1;
+            if ( pfd [1] >= 0 )
+                ::write ( pfd [1], &resultByte, 1 );
+            ::_exit ( -1 );                         
+        }
+        else if ( pid > 0 ) {
+            success = true;
+        
+            if ( pfd [1] >= 0 ) 
+                ::close ( pfd [1] );
+            if ( pfd [0] >= 0 ) {
+                while ( true ) {
+                    char resultByte;
+                    int n = ::read ( pfd [0], &resultByte, 1 );
+                    if ( n == 1 ) {
+                        success = false;
+                        break;
+                    }
+                    if (( n == -1 ) && (( errno == ECHILD ) || ( errno == EINTR )))
+                        continue;
+                        
+                    break; // success
+                }
+                ::close ( pfd [0] );
+            }
+        }
+        if ( success )    
+            StartingAppList::add( list[0] );
+        else
+            QMessageBox::warning( 0, "Error", "Could not start the application " + c, "Ok", 0, 0, 0, 1 );
     }
-    StartingAppList::add( list[0] );
 #endif //QT_NO_QWS_MULTIPROCESS
 }
 
 
 /*!
   Executes the application identfied by \a c, passing \a
   document if it isn't null.
 
   Note that a better approach might be to send a QCop message to the
   application's QPE/Application/\e{appname} channel.
 */
 void Global::execute( const QString &c, const QString& document )
 {
     if ( qApp->type() != QApplication::GuiServer ) {
         // ask the server to do the work
 #if !defined(QT_NO_COP)
         if ( document.isNull() ) {
             QCopEnvelope e( "QPE/System", "execute(QString)" );
             e << c;
         } else {
             QCopEnvelope e( "QPE/System", "execute(QString,QString)" );
             e << c << document;
         }
 #endif
         return;
     }
 
     // Attempt to execute the app using a builtin class for the app first
     // else try and find it in the bin directory
     if (builtin) {
         for (int i = 0; builtin[i].file; i++) {
             if ( builtin[i].file == c ) {
                 if ( running[i] ) {
                     if ( !document.isNull() && builtin[i].documentary )
                         setDocument(running[i], document);
                     running[i]->raise();
                     running[i]->show();
                     running[i]->setActiveWindow();
                 } else {
                     running[i] = builtin[i].func( builtin[i].maximized );
                 }
 #ifndef QT_NO_COP
                 QCopEnvelope e("QPE/System", "notBusy(QString)" );
                 e << c; // that was quick ;-)
 #endif
                 return;
             }
         }
     }
 
     //Global::invoke(c, document);
 
     // Convert the command line in to a list of arguments
     QStringList list = QStringList::split(QRegExp("  *"),c);
 
 #if !defined(QT_NO_COP)
     QString ap=list[0];
 
     qDebug("executing %s", ap.latin1() );
 
     /* if need be, sending a qcop message will result in an invoke, see
        preceeding function */
     invoke( ap );
     //{ QCopEnvelope env( ("QPE/Application/" + ap).latin1(), "raise()" ); }
     if ( !document.isEmpty() ) {
         QCopEnvelope env( ("QPE/Application/" + ap).latin1(), "setDocument(QString)" );
         env << document;
     }
 #endif
 }
 
 /*!
   Returns the string \a s with the characters '\', '"', and '$' quoted
   by a preceeding '\'.
 
   \sa stringQuote()
 */
 QString Global::shellQuote(const QString& s)
 {
     QString r="\"";
     for (int i=0; i<(int)s.length(); i++) {
         char c = s[i].latin1();
         switch (c) {
             case '\\': case '"': case '$':
                 r+="\\";
         }
         r += s[i];
     }
     r += "\"";
     return r;
 }
 
 /*!
   Returns the string \a s with the characters '\' and '"' quoted by a
   preceeding '\'.
 
   \sa shellQuote()
 */
 QString Global::stringQuote(const QString& s)
 {
     QString r="\"";
     for (int i=0; i<(int)s.length(); i++) {
         char c = s[i].latin1();
         switch (c) {
             case '\\': case '"':
                 r+="\\";
         }
         r += s[i];
     }
     r += "\"";
     return r;
 }
 
 /*!
   Finds all documents on the system's document directories which
   match the filter \a mimefilter, and appends the resulting DocLnk
   objects to \a folder.
 */
 void Global::findDocuments(DocLnkSet* folder, const QString &mimefilter)
 {
     QString homedocs = QString(getenv("HOME")) + "/Documents";
     DocLnkSet d(homedocs,mimefilter);
     folder->appendFrom(d);
     /** let's do intellegint way of searching these files
      *  a) the user don't want to check mediums global
      *  b) the user wants to check but use the global options for it
      *  c) the user wants to check it but not this medium
      *  d) the user wants to check and this medium as well
      *
      *  In all cases we need to apply a different mimefilter to
      *  the medium.
      *  a) mimefilter.isEmpty() we need to apply the responding filter
      *     either the global or the one on the medium
      *
      *  b) mimefilter is set to an application we need to find out if the
      *     mimetypes are included in the mime mask of the medium
      */
     StorageInfo storage;
     const QList<FileSystem> &fs = storage.fileSystems();
     QListIterator<FileSystem> it ( fs );
     for ( ; it.current(); ++it ) {
       if ( (*it)->isRemovable() ) { // let's find out  if we should search on it
         // this is a candidate look at the cf and see if we should search on it
         QString path = (*it)->path();
         if( !checkStorage((*it)->path() + "/.opiestorage.cf" ) )
           continue;
         DocLnkSet ide( path, mimefilter );
         folder->appendFrom(ide);
       } else if ( (*it)->disk() == "/dev/mtdblock6" || (*it)->disk() == "tmpfs" ) {
         QString path = (*it)->path() + "/Documents";
         DocLnkSet ide( path, mimefilter );
         folder->appendFrom(ide);
       }
     }
 }
 
 QStringList Global::languageList()
 {
     QString lang = getenv("LANG");
     QStringList langs;
     langs.append(lang);
     int i  = lang.find(".");
     if ( i > 0 )
         lang = lang.left( i );
     i = lang.find( "_" );
     if ( i > 0 )
         langs.append(lang.left(i));
     return langs;
 }
 
 QStringList Global::helpPath()
 {
     QStringList path;
     QStringList langs = Global::languageList();
     for (QStringList::ConstIterator it = langs.fromLast(); it!=langs.end(); --it) {
         QString lang = *it;
         if ( !lang.isEmpty() )
             path += QPEApplication::qpeDir() + "/help/" + lang + "/html";
     }
     path += QPEApplication::qpeDir() + "/pics";
     path += QPEApplication::qpeDir() + "/help/html";
     path += QPEApplication::qpeDir() + "/docs";
 
 
     return path;
 }
 
 
 #include "global.moc"