logrotate.cpp
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- /*
- * ===========================================================================
- * PRODUCTION $Log: logrotate.cpp,v $
- * PRODUCTION Revision 1000.2 2004/06/01 19:40:14 gouriano
- * PRODUCTION PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.8
- * PRODUCTION
- * ===========================================================================
- */
- /* $Id: logrotate.cpp,v 1000.2 2004/06/01 19:40:14 gouriano Exp $
- * ===========================================================================
- *
- * PUBLIC DOMAIN NOTICE
- * National Center for Biotechnology Information
- *
- * This software/database is a "United States Government Work" under the
- * terms of the United States Copyright Act. It was written as part of
- * the author's official duties as a United States Government employee and
- * thus cannot be copyrighted. This software/database is freely available
- * to the public for use. The National Library of Medicine and the U.S.
- * Government have not placed any restriction on its use or reproduction.
- *
- * Although all reasonable efforts have been taken to ensure the accuracy
- * and reliability of the software and data, the NLM and the U.S.
- * Government do not and cannot warrant the performance or results that
- * may be obtained by using this software or data. The NLM and the U.S.
- * Government disclaim all warranties, express or implied, including
- * warranties of performance, merchantability or fitness for any particular
- * purpose.
- *
- * Please cite the author in any work or product based on this material.
- *
- * ===========================================================================
- *
- * Author: Aaron Ucko, NCBI
- *
- * File Description:
- * File streams supporting log rotation
- *
- * ===========================================================================
- */
- #include <ncbi_pch.hpp>
- #include <util/logrotate.hpp>
- #include <corelib/ncbifile.hpp>
- BEGIN_NCBI_SCOPE
- CRotatingLogStreamBuf::CRotatingLogStreamBuf(CRotatingLogStream* stream,
- const string& filename,
- CT_OFF_TYPE limit,
- IOS_BASE::openmode mode)
- : m_Stream(stream),
- m_FileName(filename),
- m_Size(0),
- m_Limit(limit),
- m_Mode(mode)
- {
- open(m_FileName.c_str(), m_Mode);
- m_Size = seekoff(0, IOS_BASE::cur, IOS_BASE::out);
- }
- void CRotatingLogStreamBuf::Rotate(void)
- {
- close();
- string old_name = m_FileName; // Copy in case x_BackupName mutates.
- string new_name = m_Stream->x_BackupName(m_FileName);
- if ( !new_name.empty() ) {
- CFile(new_name).Remove();
- CFile(old_name).Rename(new_name);
- }
- open(m_FileName.c_str(), m_Mode);
- m_Size = seekoff(0, IOS_BASE::cur, IOS_BASE::out);
- }
- // The use of new_size in overflow and sync is to avoid
- // double-counting when one calls the other. (Which, if either, is
- // actually lower-level seems to vary with compiler.)
- CT_INT_TYPE CRotatingLogStreamBuf::overflow(CT_INT_TYPE c)
- {
- // The only operators CT_POS_TYPE reliably seems to support
- // are += and -=, so stick to those. :-/
- CT_POS_TYPE new_size = m_Size;
- new_size += pptr() - pbase();
- if ( !CT_EQ_INT_TYPE(c, CT_EOF) ) {
- new_size += 1;
- }
- // Perform output first, in case switching files discards data.
- CT_INT_TYPE result = CNcbiFilebuf::overflow(c);
- // Don't assume the buffer's actually empty; some implementations
- // seem to handle the case of pptr() being null by setting the
- // pointers and writing c to the buffer but not actually flushing
- // it to disk. :-/
- new_size -= pptr() - pbase();
- m_Size = new_size;
- if (m_Size - CT_POS_TYPE(0) >= m_Limit) {
- Rotate();
- }
- return result;
- }
- int CRotatingLogStreamBuf::sync(void)
- {
- // Perform output first, in case switching files discards data.
- CT_POS_TYPE new_size = m_Size;
- new_size += pptr() - pbase();
- int result = CNcbiFilebuf::sync();
- // pptr() ought to equal pbase() now, but just in case...
- new_size -= pptr() - pbase();
- m_Size = new_size;
- if (m_Size - CT_POS_TYPE(0) >= m_Limit) {
- Rotate();
- }
- return result;
- }
- string CRotatingLogStream::x_BackupName(string& name)
- {
- #if defined(NCBI_OS_UNIX) && !defined(NCBI_OS_CYGWIN)
- return name + CurrentTime().AsString(".Y-M-D-Z-h:m:s");
- #else
- // Colons are special; avoid them.
- return name + CurrentTime().AsString(".Y-M-D-Z-h-m-s");
- #endif
- }
- END_NCBI_SCOPE
- /*
- * ===========================================================================
- *
- * $Log: logrotate.cpp,v $
- * Revision 1000.2 2004/06/01 19:40:14 gouriano
- * PRODUCTION: UPGRADED [GCC34_MSVC7] Dev-tree R1.8
- *
- * Revision 1.8 2004/05/17 21:06:02 gorelenk
- * Added include of PCH ncbi_pch.hpp
- *
- * Revision 1.7 2004/02/19 22:57:56 ucko
- * Accommodate stricter implementations of CT_POS_TYPE.
- *
- * Revision 1.6 2003/03/27 23:17:41 vakatov
- * Ident
- *
- * Revision 1.5 2003/03/26 18:45:16 kans
- * add initialize default for m_Size (RS)
- *
- * Revision 1.4 2003/02/13 01:00:04 ucko
- * Limit CT_POS_TYPE operations to += and -=. (Sigh.)
- *
- * Revision 1.3 2003/02/12 19:59:11 ucko
- * Parenthesize pointer subtractions.
- *
- * Revision 1.2 2003/02/12 16:41:08 ucko
- * Always supply CRotatingLogStreamBuf::sync, and avoid double-counting
- * via run-time rather than compile-time logic.
- *
- * Revision 1.1 2002/11/25 17:21:00 ucko
- * Add support for automatic log rotation (CRotatingLogStream)
- *
- * ===========================================================================
- */