diff options
Diffstat (limited to 'src/shared/qtlockedfile/qtlockedfile_unix.cpp')
-rw-r--r-- | src/shared/qtlockedfile/qtlockedfile_unix.cpp | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/shared/qtlockedfile/qtlockedfile_unix.cpp b/src/shared/qtlockedfile/qtlockedfile_unix.cpp new file mode 100644 index 00000000000..10ae8f69c31 --- /dev/null +++ b/src/shared/qtlockedfile/qtlockedfile_unix.cpp @@ -0,0 +1,111 @@ +/*************************************************************************** +** +** This file is part of Qt Creator +** +** Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). +** +** Contact: Qt Software Information (qt-info@nokia.com) +** +** +** Non-Open Source Usage +** +** Licensees may use this file in accordance with the Qt Beta Version +** License Agreement, Agreement version 2.2 provided with the Software or, +** alternatively, in accordance with the terms contained in a written +** agreement between you and Nokia. +** +** GNU General Public License Usage +** +** Alternatively, this file may be used under the terms of the GNU General +** Public License versions 2.0 or 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the packaging +** of this file. Please review the following information to ensure GNU +** General Public Licensing requirements will be met: +** +** http://www.fsf.org/licensing/licenses/info/GPLv2.html and +** http://www.gnu.org/copyleft/gpl.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt GPL Exception +** version 1.3, included in the file GPL_EXCEPTION.txt in this package. +** +***************************************************************************/ + +#include "qtlockedfile.h" + +#include <string.h> +#include <errno.h> +#include <unistd.h> +#include <fcntl.h> + +namespace SharedTools { + +bool QtLockedFile::lock(LockMode mode, bool block) +{ + if (!isOpen()) { + qWarning("QtLockedFile::lock(): file is not opened"); + return false; + } + + if (mode == NoLock) + return unlock(); + + if (mode == m_lock_mode) + return true; + + if (m_lock_mode != NoLock) + unlock(); + + struct flock fl; + fl.l_whence = SEEK_SET; + fl.l_start = 0; + fl.l_len = 0; + fl.l_type = (mode == ReadLock) ? F_RDLCK : F_WRLCK; + int cmd = block ? F_SETLKW : F_SETLK; + int ret = fcntl(handle(), cmd, &fl); + + if (ret == -1) { + if (errno != EINTR && errno != EAGAIN) + qWarning("QtLockedFile::lock(): fcntl: %s", strerror(errno)); + return false; + } + + + m_lock_mode = mode; + return true; +} + + +bool QtLockedFile::unlock() +{ + if (!isOpen()) { + qWarning("QtLockedFile::unlock(): file is not opened"); + return false; + } + + if (!isLocked()) + return true; + + struct flock fl; + fl.l_whence = SEEK_SET; + fl.l_start = 0; + fl.l_len = 0; + fl.l_type = F_UNLCK; + int ret = fcntl(handle(), F_SETLKW, &fl); + + if (ret == -1) { + qWarning("QtLockedFile::lock(): fcntl: %s", strerror(errno)); + return false; + } + + m_lock_mode = NoLock; + return true; +} + +QtLockedFile::~QtLockedFile() +{ + if (isOpen()) + unlock(); +} + +} // namespace SharedTools |