interprocess_sync_file.h

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// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef INTERPROCESS_SYNC_FILE_H
#define INTERPROCESS_SYNC_FILE_H

#include <log/interprocess/interprocess_sync.h>
#include <exceptions/exceptions.h>

namespace isc {
namespace log {
namespace interprocess {

class InterprocessSyncFileError : public Exception {
public:
    InterprocessSyncFileError(const char* file, size_t line,
                              const char* what) :
        isc::Exception(file, line, what) {}
};

class InterprocessSyncFile : public InterprocessSync {
public:
    InterprocessSyncFile(const std::string& task_name) :
        InterprocessSync(task_name), fd_(-1)
    {}

    virtual ~InterprocessSyncFile();

protected:
    bool lock();

    bool tryLock();

    bool unlock();

private:
    bool do_lock(int cmd, short l_type);

    int fd_; 
};

} // namespace interprocess
} // namespace log
} // namespace isc

#endif // INTERPROCESS_SYNC_FILE_H