diff options
Diffstat (limited to 'src/libs/kdtools/kdlockfile_unix.cpp')
-rw-r--r-- | src/libs/kdtools/kdlockfile_unix.cpp | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/libs/kdtools/kdlockfile_unix.cpp b/src/libs/kdtools/kdlockfile_unix.cpp new file mode 100644 index 000000000..c40eb3b7d --- /dev/null +++ b/src/libs/kdtools/kdlockfile_unix.cpp @@ -0,0 +1,77 @@ +/**************************************************************************** +** Copyright (C) 2001-2010 Klaralvdalens Datakonsult AB. All rights reserved. +** +** This file is part of the KD Tools library. +** +** Licensees holding valid commercial KD Tools licenses may use this file in +** accordance with the KD Tools Commercial License Agreement provided with +** the Software. +** +** +** This file may be distributed and/or modified under the terms of the +** GNU Lesser General Public License version 2 and version 3 as published by the +** Free Software Foundation and appearing in the file LICENSE.LGPL included. +** +** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE +** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. +** +** Contact info@kdab.com if any conditions of this licensing are not +** clear to you. +** +**********************************************************************/ + +#include "kdlockfile_p.h" + +#include <QtCore/QCoreApplication> + +#include <cerrno> + +#include <sys/file.h> + +KDLockFile::Private::~Private() +{ + unlock(); +} + +bool KDLockFile::Private::lock() +{ + if (locked) + return true; + + errorString.clear(); + errno = 0; + handle = open(filename.toLatin1().constData(), O_CREAT | O_RDWR | O_NONBLOCK, 0600); + if (handle == -1) { + errorString = QObject::tr("Could not create lock file %1: %2").arg(filename, QLatin1String(strerror(errno))); + return false; + } + const QString pid = QString::number(qApp->applicationPid()); + const QByteArray data = pid.toLatin1(); + errno = 0; + qint64 written = 0; + while (written < data.size()) { + const qint64 n = write(handle, data.constData() + written, data.size() - written); + if (n < 0) { + errorString = QObject::tr("Could not write PID to lock file %1: %2").arg( filename, QLatin1String( strerror( errno ) ) ); + return false; + } + written += n; + } + errno = 0; + locked = flock(handle, LOCK_NB | LOCK_EX) != -1; + if (!locked) + errorString = QObject::tr("Could not lock lock file %1: %2").arg(filename, QLatin1String(strerror(errno))); + return locked; +} + +bool KDLockFile::Private::unlock() +{ + errorString.clear(); + if (!locked) + return true; + errno = 0; + locked = flock(handle, LOCK_UN | LOCK_NB) == -1; + if (locked) + errorString = QObject::tr("Could not unlock lock file %1: %2").arg(filename, QLatin1String(strerror(errno))); + return !locked; +} |