Fix to prevent segfault when no process/module is selected in list.

2 files changed, 11 insertions, 1 deletions

diff --git a/noncore/settings/sysinfo/modulesinfo.cpp b/noncore/settings/sysinfo/modulesinfo.cpp
index 8b58fe9..29cce90 100644
--- a/noncore/settings/sysinfo/modulesinfo.cpp
+++ b/noncore/settings/sysinfo/modulesinfo.cpp
@@ -1,174 +1,179 @@
 /**********************************************************************
 ** ModulesInfo
 **
 ** Display Modules information
 **
 ** Copyright (C) 2002, Michael Lauer
 **                    mickey@tm.informatik.uni-frankfurt.de
 **                    http://www.Vanille.de
 **
 ** Based on ProcessInfo by Dan Williams <williamsdr@acm.org>
 **
 ** 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.
 **
 **********************************************************************/
 
 #include <qpe/qpeapplication.h>
 
 #include <qcombobox.h>
 #include <qfile.h>
 #include <qheader.h>
 #include <qlayout.h>
 #include <qlistview.h>
 #include <qmessagebox.h>
 #include <qpushbutton.h>
 #include <qstring.h>
 #include <qtimer.h>
 #include <qwhatsthis.h>
 
 #include "modulesinfo.h"
 #include "detail.h"
 
 ModulesInfo::ModulesInfo( QWidget* parent,  const char* name, WFlags fl )
     : QWidget( parent, name, fl )
 {
     QGridLayout *layout = new QGridLayout( this );
     layout->setSpacing( 4 );
     layout->setMargin( 4 );
 
     ModulesView = new QListView( this );
     int colnum = ModulesView->addColumn( tr( "Module" ) );
     colnum = ModulesView->addColumn( tr( "Size" ) );
     ModulesView->setColumnAlignment( colnum, Qt::AlignRight );
     colnum = ModulesView->addColumn( tr( "Use#" ) );
     ModulesView->setColumnAlignment( colnum, Qt::AlignRight );
     colnum = ModulesView->addColumn( tr( "Used By" ) );
     ModulesView->setAllColumnsShowFocus( TRUE );
     layout->addMultiCellWidget( ModulesView, 0, 0, 0, 1 );
     QWhatsThis::add( ModulesView, tr( "This is a list of all the kernel modules currently loaded on this handheld device.\n\nClick and hold on a module to see additional information about the module, or to unload it." ) );
         
         // Test if we have /sbin/modinfo, and if so, allow module detail window
         if ( QFile::exists( "/sbin/modinfo" ) )
         {
                 QPEApplication::setStylusOperation( ModulesView->viewport(), QPEApplication::RightOnHold );
             connect( ModulesView, SIGNAL( rightButtonPressed( QListViewItem *, const QPoint &, int ) ),
                                  this, SLOT( viewModules( QListViewItem * ) ) );
         }
 
     CommandCB = new QComboBox( FALSE, this );
     CommandCB->insertItem( "modprobe -r" );
     CommandCB->insertItem( "rmmod" );
     // I can't think of other useful commands yet. Anyone?
     layout->addWidget( CommandCB, 1, 0 );
     QWhatsThis::add( CommandCB, tr( "Select a command here and then click the Send button to the right to send the command to module selected above." ) );
 
     QPushButton *btn = new QPushButton( this );
     btn->setMinimumSize( QSize( 50, 24 ) );
     btn->setMaximumSize( QSize( 50, 24 ) );
     btn->setText( tr( "Send" ) );
     connect( btn, SIGNAL( clicked() ), this, SLOT( slotSendClicked() ) );
     layout->addWidget( btn, 1, 1 );
     QWhatsThis::add( btn, tr( "Click here to send the selected command to the module selected above." ) );
 
     QTimer *t = new QTimer( this );
     connect( t, SIGNAL( timeout() ), this, SLOT( updateData() ) );
     t->start( 5000 );
         
     updateData();
         
         ModulesDtl = new Detail();
     QWhatsThis::add( ModulesDtl->detailView, tr( "This area shows detailed information about this module." ) );
 }
 
 ModulesInfo::~ModulesInfo()
 {
 }
 
 void ModulesInfo::updateData()
 {
     char modname[64];
     char usage[200];
     int modsize, usecount;
 
     ModulesView->clear();
 
     FILE *procfile = fopen( ( QString ) ( "/proc/modules"), "r");
 
     if ( procfile )
     {
         while ( true ) {
             int success = fscanf( procfile, "%s%d%d%[^\n]", modname, &modsize, &usecount, usage );
 
             if ( success == EOF )
                 break;
 
             QString qmodname = QString( modname );
             QString qmodsize = QString::number( modsize ).rightJustify( 6, ' ' );
             QString qusecount = QString::number( usecount ).rightJustify( 2, ' ' );
             QString qusage = QString( usage );
 
             ( void ) new QListViewItem( ModulesView, qmodname, qmodsize, qusecount, qusage );
         }
 
         fclose( procfile );
     }
 }
 
 void ModulesInfo::slotSendClicked()
 {
+        if ( !ModulesView->currentItem() )
+        {
+                return;
+        }
+        
         QString capstr = tr( "You really want to execute\n" );
         capstr.append( CommandCB->currentText() );
         capstr.append( "\nfor this module?" );
 
         QString modname = ModulesView->currentItem()->text( 0 );
         
     if ( QMessageBox::warning( this, modname, capstr,
          QMessageBox::Yes | QMessageBox::Default, QMessageBox::No | QMessageBox::Escape ) == QMessageBox::Yes )
     {
                 QString command = "/sbin/";
                 command.append( CommandCB->currentText() );
                 command.append( " " );
                 command.append( modname );
 
         FILE* stream = popen( command, "r" );
         if ( stream )
             pclose( stream );
     }
 
 }
 
 void ModulesInfo::viewModules( QListViewItem *modules )
 {
     QString modname = modules->text( 0 );   
         QString capstr = "Module: ";
         capstr.append( modname );
     ModulesDtl->setCaption( capstr );
     QString command = "/sbin/modinfo -nad ";
         command.append( modname );
     FILE* modinfo = popen( command, "r" );
     
     if ( modinfo )
     {
         char line[200];
         ModulesDtl->detailView->setText( " Details:\n------------\n" );
         
         while( true )
         {        
             int success = fscanf( modinfo, "%[^\n]\n", line );
             if ( success == EOF )
                 break;         
             ModulesDtl->detailView->append( line );
         }
         
         pclose( modinfo );
     }
 
     ModulesDtl->showMaximized();
 }
 
diff --git a/noncore/settings/sysinfo/processinfo.cpp b/noncore/settings/sysinfo/processinfo.cpp
index 35d7ba1..9a5446a 100644
--- a/noncore/settings/sysinfo/processinfo.cpp
+++ b/noncore/settings/sysinfo/processinfo.cpp
@@ -1,185 +1,190 @@
 /**********************************************************************
 ** ProcessInfo
 **
 ** Display process information
 **
 ** Copyright (C) 2002, Dan Williams
 **                    williamsdr@acm.org
 **                    http://draknor.net
 **
 ** 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.
 **
 **********************************************************************/
 
 #include <qpe/qpeapplication.h>
 
 #include <qdir.h>
 #include <qfile.h>
 #include <qheader.h>
 #include <qlayout.h>
 #include <qlistview.h>
 #include <qmessagebox.h>
 #include <qtimer.h>
 #include <qwhatsthis.h>
 
 #include <sys/types.h>
 #include <signal.h>
 
 #include "processinfo.h"
 #include "detail.h"
 
 ProcessInfo::ProcessInfo( QWidget* parent,  const char* name, WFlags fl )
     : QWidget( parent, name, fl )
 {
     QGridLayout *layout = new QGridLayout( this );
     layout->setSpacing( 4 );
     layout->setMargin( 4 );
 
 
     ProcessView = new QListView( this, "ProcessView" );
     int colnum = ProcessView->addColumn( tr( "PID" ) );
     ProcessView->setColumnAlignment( colnum, Qt::AlignRight );
     colnum = ProcessView->addColumn( tr( "Command" ),96 );
     colnum = ProcessView->addColumn( tr( "Status" ) );
     colnum = ProcessView->addColumn( tr( "Time" ) );
     ProcessView->setColumnAlignment( colnum, Qt::AlignRight );
     ProcessView->setAllColumnsShowFocus( TRUE );
     QPEApplication::setStylusOperation( ProcessView->viewport(), QPEApplication::RightOnHold );
     connect( ProcessView, SIGNAL( rightButtonPressed( QListViewItem *, const QPoint &, int ) ),
             this, SLOT( viewProcess( QListViewItem * ) ) );
     layout->addMultiCellWidget( ProcessView, 0, 0, 0, 1 );
     QWhatsThis::add( ProcessView, tr( "This is a list of all the processes on this handheld device.\n\nClick and hold on a process to see additional information about the process, or to send a signal to it." ) );
     
         SignalCB = new QComboBox( FALSE, this, "SignalCB" );
     SignalCB->insertItem( " 1: SIGHUP" );
     SignalCB->insertItem( " 2: SIGINT" );
     SignalCB->insertItem( " 3: SIGQUIT" );
     SignalCB->insertItem( " 5: SIGTRAP" );
     SignalCB->insertItem( " 6: SIGABRT" );
     SignalCB->insertItem( " 9: SIGKILL" );
     SignalCB->insertItem( "14: SIGALRM" );
     SignalCB->insertItem( "15: SIGTERM" );
     SignalCB->insertItem( "18: SIGCONT" );
     SignalCB->insertItem( "19: SIGSTOP" );
     layout->addWidget( SignalCB, 1, 0 );
     QWhatsThis::add( SignalCB, tr( "Select a signal here and then click the Send button to the right to send to this process." ) );
 
     SendButton = new QPushButton( this, "SendButton" );
     SendButton->setMinimumSize( QSize( 50, 24 ) );
     SendButton->setMaximumSize( QSize( 50, 24 ) );
     SendButton->setText( tr( "Send" ) );
     connect( SendButton, SIGNAL( clicked() ), this, SLOT( slotSendClicked() ) );
     layout->addWidget( SendButton, 1, 1 );
     QWhatsThis::add( SendButton, tr( "Click here to send the selected signal to this process." ) );
 
     QTimer *t = new QTimer( this );
     connect( t, SIGNAL( timeout() ), this, SLOT( updateData() ) );
     t->start( 5000 );
 
     updateData();
 
     ProcessDtl = new Detail();
     QWhatsThis::add( ProcessDtl->detailView, tr( "This area shows detailed information about this process." ) );
 }
 
 ProcessInfo::~ProcessInfo()
 {
 }
 
 void ProcessInfo::updateData()
 {
     int pid, ppid, pgrp, session, tty, tpgid, utime, stime, cutime, cstime, counter, priority, starttime,
        signal, blocked, sigignore, sigcatch;
     uint flags, minflt, cminflt, majflt, cmajflt, timeout, itrealvalue, vsize, rss, rlim, startcode,
          endcode, startstack, kstkesp, kstkeip, wchan;
     char state;
     char comm[64];
 
     ProcessView->clear();
 
     QDir *procdir = new QDir("/proc", 0, QDir::Name, QDir::Dirs);
     QFileInfoList *proclist = new QFileInfoList(*(procdir->entryInfoList()));
     if ( proclist )
     {
         QFileInfoListIterator it(*proclist);
         QFileInfo *f;
         while ( ( f = it.current() ) != 0 )
         {
             ++it;
             QString processnum = f->fileName();
             if ( processnum >= "1" && processnum <= "99999" )
             {
                 FILE *procfile = fopen( ( QString ) ( "/proc/" + processnum + "/stat"), "r");
 
                 if ( procfile )
                 {
                     fscanf( procfile,
                            "%d %s %c %d %d %d %d %d %u %u %u %u %u %d %d %d %d %d %d %u %u %d %u %u %u %u %u %u %u %u %d %d %d %d %u",
                            &pid, comm, &state, &ppid, &pgrp, &session,&tty, &tpgid, &flags, &minflt, &cminflt,
                            &majflt, &cmajflt, &utime, &stime, &cutime, &cstime, &counter, &priority, &timeout,
                            &itrealvalue, &starttime, &vsize, &rss, &rlim, &startcode, &endcode, &startstack,
                            &kstkesp, &kstkeip, &signal, &blocked, &sigignore, &sigcatch, &wchan );
                     processnum = processnum.rightJustify( 5, ' ' );
                     QString processcmd = QString( comm ).replace( QRegExp( "[()]" ), "" );
                     QString processstatus = QChar(state);
                     QString processtime = QString::number( ( utime + stime ) / 100 );
                     processtime = processtime.rightJustify( 9, ' ' );
                     fclose( procfile );
 
                     ( void ) new QListViewItem( ProcessView, processnum, processcmd, processstatus, processtime );
                 }
             }
         }
     }
 
     delete proclist;
     delete procdir;
 }
 
 void ProcessInfo::slotSendClicked()
 {
+        QListViewItem *currprocess = ProcessView->currentItem();
+        if ( !currprocess )
+        {
+                return;
+        }
+        
         QString capstr = tr( "You really want to send\n" );
         capstr.append( SignalCB->currentText() );
         capstr.append( "\nto this process?" );
 
-        QListViewItem *currprocess = ProcessView->currentItem();
         
     if ( QMessageBox::warning( this, currprocess->text( 1 ), capstr,
          QMessageBox::Yes | QMessageBox::Default, QMessageBox::No | QMessageBox::Escape ) == QMessageBox::Yes )
         {
                 QString sigstr = SignalCB->currentText();
                 sigstr.truncate(2);
                 int sigid = sigstr.toUInt();
         if ( kill( currprocess->text( 0 ).stripWhiteSpace().toUInt(), sigid ) == 0 )
         {
             hide();
         }
     }
 
 }
 
 void ProcessInfo::viewProcess( QListViewItem *process )
 {
     QString pid= process->text( 0 ).stripWhiteSpace();
     QString command = process->text( 1 );
     ProcessDtl->setCaption( pid + " - " + command );
     FILE *statfile = fopen( ( QString ) ( "/proc/" + pid + "/status"), "r");
     if ( statfile )
     {
         char line[81];
         fgets( line, 81, statfile );
         ProcessDtl->detailView->setText( line );
         while ( fgets( line, 81, statfile ) )
         {
             ProcessDtl->detailView->append( line );
         }
         fclose( statfile );
     }
     ProcessDtl->showMaximized();
 }