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78 lines
2.3 KiB
78 lines
2.3 KiB
15 years ago
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/* This file is part of indexlib.
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* Copyright (C) 2005 Luís Pedro Coelho <luis@luispedro.org>
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*
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* Indexlib is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation and available as file
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* GPL_V2 which is distributed along with indexlib.
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*
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* Indexlib is distributed in the hope that it will be useful, but
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* 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of this program with any edition of
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* the Qt library by Trolltech AS, Norway (or with modified versions
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* of Qt that use the same license as Qt), and distribute linked
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* combinations including the two. You must obey the GNU General
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* Public License in all respects for all of the code used other than
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* Qt. If you modify this file, you may extend this exception to
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* your version of the file, but you are not obligated to do so. If
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* you do not wish to do so, delete this exception statement from
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* your version.
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*/
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#include "lockfile.h"
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#include "format.h"
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#include "logfile.h"
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#include <iostream>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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using indexlib::detail::lockfile;
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lockfile::lockfile( std::string filename ):
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filename_( filename ),
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locked_( false ) {
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}
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lockfile::~lockfile() {
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if ( locked() ) unlock();
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}
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bool lockfile::locked() const {
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return locked_;
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}
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bool lockfile::trylock() {
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int fd = ::open( filename_.c_str(), O_RDWR | O_EXCL | O_CREAT, 0600 );
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locked_ = false;
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if ( fd >= 0 ) {
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locked_ = true;
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close( fd );
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}
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logfile() << format( "trylock(%s) returning %s (fd:%s) (error:%s)\n" ) % filename_ % locked_ %fd % strerror( errno );
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return locked_;
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}
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void lockfile::unlock() {
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if ( locked() ) {
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unlink( filename_.c_str() );
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locked_ = false;
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}
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}
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void lockfile::force_unlock() {
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unlink( filename_.c_str() );
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locked_ = false;
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}
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