69 lines
2 KiB
C
69 lines
2 KiB
C
/*
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filehandle - filehandle management and caching
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Copyright (C) Lumiera.org
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2008, Christian Thaeter <ct@pipapo.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef LUMIERA_FILEHANDLE_H
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#define LUMIERA_FILEHANDLE_H
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#include "lib/error.h"
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#include "lib/llist.h"
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typedef struct lumiera_filehandle_struct lumiera_filehandle;
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typedef lumiera_filehandle* LumieraFilehandle;
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#include "backend/filedescriptor.h"
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/**
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* @file
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* Filehandles.
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* Filehandles manage the underlying POSIX filehandle for a filedescriptor.
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* Since we want to support handling of more files than POSIX filehandles are available on a common system
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* the filehandles are opened, cached and closed on demand, see 'filehandlecache'.
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*/
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/**
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* File handles
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*/
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struct lumiera_filehandle_struct
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{
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llist cachenode;
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int fd;
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unsigned use_cnt;
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LumieraFiledescriptor descriptor;
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};
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/**
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* Allocate a new filehandle structure.
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* @return new filehandle structure
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*/
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LumieraFilehandle
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lumiera_filehandle_new ();
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/**
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* destroy the resources associated eith a filehandle structure.
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* This function is used by the filehandlecache to recycle filehandle structs.
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* @param node pointer to the cachenode member of a struct filehandle
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* @return pointer to the start of the memory of the destroyed filehandle
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*/
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void*
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lumiera_filehandle_destroy_node (LList node);
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#endif
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