104 lines
3.5 KiB
C++
104 lines
3.5 KiB
C++
#include "qxtfilelock.h"
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/****************************************************************************
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** Copyright (c) 2006 - 2011, the LibQxt project.
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** See the Qxt AUTHORS file for a list of authors and copyright holders.
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** * Neither the name of the LibQxt project nor the
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** names of its contributors may be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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** WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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** DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
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** DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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** (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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** ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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** SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**
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** <http://libqxt.org> <foundation@libqxt.org>
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*****************************************************************************/
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#include "qxtfilelock_p.h"
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#include <windows.h>
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#include <io.h>
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bool QxtFileLock::unlock()
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{
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if (file() && file()->isOpen() && isActive())
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{
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HANDLE w32FileHandle;
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OVERLAPPED ov1;
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w32FileHandle = (HANDLE)_get_osfhandle(file()->handle());
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if (w32FileHandle == INVALID_HANDLE_VALUE)
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return false;
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memset(&ov1, 0, sizeof(ov1));
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ov1.Offset = qxt_d().offset;
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if (UnlockFileEx(w32FileHandle, 0, qxt_d().length, 0, &ov1))
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{
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qxt_d().isLocked = false;
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return true;
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}
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}
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return false;
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}
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bool QxtFileLock::lock()
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{
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if (file() && file()->isOpen() && !isActive())
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{
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HANDLE w32FileHandle;
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OVERLAPPED ov1;
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DWORD dwflags;
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w32FileHandle = (HANDLE)_get_osfhandle(file()->handle());
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if (w32FileHandle == INVALID_HANDLE_VALUE)
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return false;
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switch (qxt_d().mode)
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{
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case ReadLock:
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dwflags = LOCKFILE_FAIL_IMMEDIATELY;
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break;
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case ReadLockWait:
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dwflags = 0;
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break;
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case WriteLock:
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dwflags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
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break;
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case WriteLockWait:
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dwflags = LOCKFILE_EXCLUSIVE_LOCK;
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break;
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default:
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return (false);
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}
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memset(&ov1, 0, sizeof(ov1));
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ov1.Offset = qxt_d().offset;
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if (LockFileEx(w32FileHandle, dwflags, 0, qxt_d().length, 0, &ov1))
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{
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qxt_d().isLocked = true;
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return true;
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}
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}
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return false;
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}
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