mirror of
https://github.com/strawberrymusicplayer/strawberry
synced 2024-12-27 16:54:19 +01:00
115 lines
3.4 KiB
C++
115 lines
3.4 KiB
C++
/****************************************************************************
|
|
**
|
|
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
|
|
** All rights reserved.
|
|
**
|
|
** Contact: Nokia Corporation (qt-info@nokia.com)
|
|
**
|
|
** This file is part of a Qt Solutions component.
|
|
**
|
|
** You may use this file under the terms of the BSD license as follows:
|
|
**
|
|
** "Redistribution and use in source and binary forms, with or without
|
|
** modification, are permitted provided that the following conditions are
|
|
** met:
|
|
** * Redistributions of source code must retain the above copyright
|
|
** notice, this list of conditions and the following disclaimer.
|
|
** * Redistributions in binary form must reproduce the above copyright
|
|
** notice, this list of conditions and the following disclaimer in
|
|
** the documentation and/or other materials provided with the
|
|
** distribution.
|
|
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
|
|
** the names of its contributors may be used to endorse or promote
|
|
** products derived from this software without specific prior written
|
|
** permission.
|
|
**
|
|
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
|
|
**
|
|
****************************************************************************/
|
|
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
|
|
#include "qtlockedfile.h"
|
|
|
|
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();
|
|
}
|
|
|