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101 lines
3.0 KiB
101 lines
3.0 KiB
15 years ago
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/* This file is part of indexlib.
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* Copyright (C) 2005 Luís Pedro Coelho <luis@luispedro.org>
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*
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* Indexlib is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation and available as file
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* GPL_V2 which is distributed along with indexlib.
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*
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* Indexlib is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of this program with any edition of
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* the Qt library by Trolltech AS, Norway (or with modified versions
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* of Qt that use the same license as Qt), and distribute linked
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* combinations including the two. You must obey the GNU General
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* Public License in all respects for all of the code used other than
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* Qt. If you modify this file, you may extend this exception to
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* your version of the file, but you are not obligated to do so. If
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* you do not wish to do so, delete this exception statement from
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* your version.
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*/
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#include "mmap_manager.h"
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#include "logfile.h"
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#include "exception.h"
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <strings.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <cstring>
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#include "format.h"
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using indexlib::detail::errno_error;
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mmap_manager::mmap_manager( std::string filename )
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:filename_( filename ),
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pagesize_( ( size_t )sysconf( _SC_PAGESIZE ) ),
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base_( 0 ),
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size_( 0 )
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{
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fd_ = open( filename.c_str(), O_RDWR | O_CREAT, 0644 );
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logfile() << format( "open( %s, O_RDWR) returned %s\n" ) % filename % fd_;
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if ( fd_ > 0 ) {
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struct stat st;
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if ( fstat( fd_, &st ) == -1 ) {
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throw errno_error( "stat()" );
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}
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if ( st.st_size ) map( st.st_size );
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} else {
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fd_ = open( filename.c_str(), O_RDWR );
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if ( !fd_ ) throw errno_error( "open()" );
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}
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}
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mmap_manager::~mmap_manager()
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{
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unmap();
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close( fd_ );
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}
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void mmap_manager::resize( unsigned ns ) {
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if ( size() >= ns ) return;
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unsigned old_size = size();
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unmap();
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ns = ( ns / pagesize_ + bool( ns % pagesize_ ) ) * pagesize_;
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ftruncate( fd_, ns );
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map( ns );
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logfile() << format( "Going to bzero from %s to %s)\n" ) % old_size % size();
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memset( rw_base( old_size ), 0, size() - old_size );
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}
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void mmap_manager::unmap() {
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if ( !base_ ) return;
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if ( munmap( base_, size_ ) == -1 ) {
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throw errno_error( "munmap()" ); // This should be BUG
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}
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base_ = 0;
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size_ = 0;
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}
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void mmap_manager::map( unsigned size ) {
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base_ = mmap( 0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd_, 0 );
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if ( base_ == reinterpret_cast<void*>( -1 ) ) {
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throw errno_error( "mmap()" );
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}
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size_ = size;
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}
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