Method createSegment

src/jrd/replication/ChangeLog.cpp:943–971

}

ChangeLog::Segment* ChangeLog::createSegment()
{
	const auto state = m_sharedMemory->getHeader();
	const auto sequence = state->sequence + 1;

	PathName filename;
	filename.printf(FILENAME_PATTERN, m_config->filePrefix.c_str(), sequence);
	filename = m_config->journalDirectory + filename;

	const auto fd = os_utils::openCreateSharedFile(filename.c_str(), O_EXCL | O_BINARY);

	SegmentHeader dummyHeader = {0};
	if (::write(fd, &dummyHeader, sizeof(SegmentHeader)) != sizeof(SegmentHeader))
	{
		::close(fd);
		raiseError("Journal file %s write failed (error %d)", filename.c_str(), ERRNO);
	}

	const auto segment = FB_NEW_POOL(getPool()) Segment(getPool(), filename, fd);

	segment->init(sequence, m_guid);
	segment->addRef();

	m_segments.add(segment);
	state->generation++;
	state->sequence++;

	return segment;
}

ChangeLog::Segment* ChangeLog::reuseSegment(ChangeLog::Segment* segment)
{