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163 lines
4.1 KiB
163 lines
4.1 KiB
/*
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This file is part of libkabc.
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Copyright (c) 2001,2003 Cornelius Schumacher <schumacher@kde.org>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "lock.h"
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#include <tdeapplication.h>
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#include <kdebug.h>
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#include <klocale.h>
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#include <kstandarddirs.h>
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#include <ktempfile.h>
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#include <tqfile.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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using namespace KABC;
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Lock::Lock( const TQString &identifier )
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: mIdentifier( identifier )
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{
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mIdentifier.replace( "/", "_" );
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}
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Lock::~Lock()
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{
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unlock();
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}
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TQString Lock::locksDir()
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{
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return locateLocal( "data", "kabc/lock/" );
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}
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bool Lock::readLockFile( const TQString &filename, int &pid, TQString &app )
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{
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TQFile file( filename );
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if ( !file.open( IO_ReadOnly ) ) return false;
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TQTextStream t( &file );
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pid = t.readLine().toInt();
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app = t.readLine();
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return true;
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}
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bool Lock::writeLockFile( const TQString &filename )
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{
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TQFile file( filename );
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if ( !file.open( IO_WriteOnly ) ) return false;
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TQTextStream t( &file );
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t << ::getpid() << endl << TQString( TDEGlobal::instance()->instanceName() );
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return true;
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}
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TQString Lock::lockFileName() const
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{
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return locksDir() + mIdentifier + ".lock";
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}
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bool Lock::lock()
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{
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kdDebug(5700) << "Lock::lock()" << endl;
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TQString lockName = lockFileName();
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kdDebug(5700) << "-- lock name: " << lockName << endl;
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if ( TQFile::exists( lockName ) ) { // check if it is a stale lock file
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int pid;
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TQString app;
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if ( !readLockFile( lockFileName(), pid, app ) ) {
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mError = i18n("Unable to open lock file.");
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return false;
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}
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int retval = ::kill( pid, 0 );
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if ( retval == -1 && errno == ESRCH ) { // process doesn't exists anymore
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TQFile::remove( lockName );
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kdWarning(5700) << "Removed stale lock file from process '" << app << "'"
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<< endl;
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} else {
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TQString identifier( mIdentifier );
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identifier.replace( '_', '/' );
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mError = i18n("The address book '%1' is locked by application '%2'.\nIf you believe this is incorrect, just remove the lock file from '%3'")
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.arg( identifier ).arg( app ).arg( locateLocal( "data", "kabc/lock/*.lock" ) );
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return false;
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}
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}
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TQString lockUniqueName;
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lockUniqueName = mIdentifier + kapp->randomString( 8 );
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mLockUniqueName = locateLocal( "data", "kabc/lock/" + lockUniqueName );
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kdDebug(5700) << "-- lock unique name: " << mLockUniqueName << endl;
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// Create unique file
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writeLockFile( mLockUniqueName );
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// Create lock file
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int result = ::link( TQFile::encodeName( mLockUniqueName ),
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TQFile::encodeName( lockName ) );
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if ( result == 0 ) {
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mError = "";
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emit locked();
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return true;
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}
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// TODO: check stat
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mError = i18n("Error");
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return false;
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}
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bool Lock::unlock()
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{
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int pid;
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TQString app;
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if ( readLockFile( lockFileName(), pid, app ) ) {
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if ( pid == getpid() ) {
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TQFile::remove( lockFileName() );
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TQFile::remove( mLockUniqueName );
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emit unlocked();
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} else {
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mError = i18n("Unlock failed. Lock file is owned by other process: %1 (%2)")
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.arg( app ).arg( TQString::number( pid ) );
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kdDebug() << "Lock::unlock(): " << mError << endl;
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return false;
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}
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}
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mError = "";
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return true;
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}
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TQString Lock::error() const
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{
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return mError;
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}
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#include "lock.moc"
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