115 lines
3 KiB
C
115 lines
3 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
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the 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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/** @file filehandle.c
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** Implementation of filehandle representation.
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** @todo development in this area is stalled since 2010
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*/
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#include "include/logging.h"
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#include "lib/llist.h"
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#include "lib/safeclib.h"
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#include "vault/file.h"
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#include "vault/filehandle.h"
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#include "vault/filedescriptor.h"
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#include <unistd.h>
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LumieraFilehandle
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lumiera_filehandle_init (LumieraFilehandle self, LumieraFiledescriptor desc)
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{
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TRACE (filehandle_dbg, "%p", self);
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if (self)
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{
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llist_init (&self->cachenode);
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self->fd = -1;
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self->use_cnt = 1;
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self->descriptor = desc;
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}
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return self;
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}
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LumieraFilehandle
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lumiera_filehandle_new (LumieraFiledescriptor desc)
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{
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LumieraFilehandle self = lumiera_malloc (sizeof (*self));
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return lumiera_filehandle_init (self, desc);
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}
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void*
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lumiera_filehandle_destroy_node (LList node)
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{
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TRACE (filehandle_dbg);
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REQUIRE (llist_is_empty (node));
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LumieraFilehandle self = (LumieraFilehandle)node;
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REQUIRE (self->use_cnt == 0);
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if (self->fd >= 0)
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close (self->fd);
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return self;
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}
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int
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lumiera_filehandle_handle (LumieraFilehandle self)
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{
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TRACE (filehandle_dbg);
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int fd = -1;
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if (self->fd == -1)
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{
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fd = open (lumiera_filedescriptor_name (self->descriptor), lumiera_filedescriptor_flags (self->descriptor) & LUMIERA_FILE_MASK);
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if (fd == -1)
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{
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//////////////////////TODO Handle EMFILE etc with the resourcecollector
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LUMIERA_ERROR_SET_CRITICAL (file, ERRNO, lumiera_filedescriptor_name (self->descriptor));
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}
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else
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{
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struct stat st;
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if (fstat (fd, &st) == -1)
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{
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close (fd);
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fd = -1;
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LUMIERA_ERROR_SET_CRITICAL (file, ERRNO, lumiera_filedescriptor_name (self->descriptor));
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}
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else if (!lumiera_filedescriptor_samestat (self->descriptor, &st))
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{
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close (fd);
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fd = -1;
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/* Woops this is not the file we expected to use */
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LUMIERA_ERROR_SET_CRITICAL (file, FILE_CHANGED, lumiera_filedescriptor_name (self->descriptor));
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}
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}
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self->fd = fd;
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}
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return self->fd;
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}
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