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/*
* Copyright 2009 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/base/filelock.h"
#include "webrtc/base/fileutils.h"
#include "webrtc/base/logging.h"
#include "webrtc/base/pathutils.h"
#include "webrtc/base/stream.h"
namespace rtc {
FileLock::FileLock(const std::string& path, FileStream* file)
: path_(path), file_(file) {
}
FileLock::~FileLock() {
MaybeUnlock();
}
void FileLock::Unlock() {
LOG_F(LS_INFO);
MaybeUnlock();
}
void FileLock::MaybeUnlock() {
if (file_) {
LOG(LS_INFO) << "Unlocking:" << path_;
file_->Close();
Filesystem::DeleteFile(path_);
file_.reset();
}
}
FileLock* FileLock::TryLock(const std::string& path) {
FileStream* stream = new FileStream();
bool ok = false;
#if defined(WEBRTC_WIN)
// Open and lock in a single operation.
ok = stream->OpenShare(path, "a", _SH_DENYRW, NULL);
#else // WEBRTC_LINUX && !WEBRTC_ANDROID and WEBRTC_MAC && !defined(WEBRTC_IOS)
ok = stream->Open(path, "a", NULL) && stream->TryLock();
#endif
if (ok) {
return new FileLock(path, stream);
} else {
// Something failed, either we didn't succeed to open the
// file or we failed to lock it. Anyway remove the heap
// allocated object and then return NULL to indicate failure.
delete stream;
return NULL;
}
}
} // namespace rtc
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