232afe77e9
* add 'backend' for backend global initialization/destruction and common functions. * WIP: 'file' acts as interface to named files, provides posix filehandles with and acquire/release function pair. * 'filehandle' manages posix filehandles internally, refcounted. * WIP: 'filehandlecache' keeps unused filehandles in a MRU cache * WIP: test for filehandle management * improved filedescriptor test
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
|
|
filehandle - filehandle management and caching
|
|
|
|
Copyright (C) Lumiera.org
|
|
2008, Christian Thaeter <ct@pipapo.org>
|
|
|
|
This program is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include "lib/llist.h"
|
|
#include "lib/safeclib.h"
|
|
|
|
#include "backend/file.h"
|
|
#include "backend/filehandle.h"
|
|
#include "backend/filedescriptor.h"
|
|
|
|
#include <unistd.h>
|
|
|
|
NOBUG_DEFINE_FLAG_PARENT (filehandle, file_all);
|
|
|
|
LumieraFilehandle
|
|
lumiera_filehandle_new ()
|
|
{
|
|
LumieraFilehandle self = lumiera_malloc (sizeof (lumiera_filehandle));
|
|
TRACE (filehandle, "%p", self);
|
|
|
|
llist_init (&self->cachenode);
|
|
self->fd = -1;
|
|
self->use_cnt = 1;
|
|
self->descriptor = NULL;
|
|
|
|
return self;
|
|
}
|
|
|
|
|
|
void*
|
|
lumiera_filehandle_destroy_node (LList node)
|
|
{
|
|
TRACE (filehandle);
|
|
REQUIRE (llist_is_empty (node));
|
|
LumieraFilehandle self = (LumieraFilehandle)node;
|
|
REQUIRE (self->use_cnt == 0);
|
|
|
|
if (self->fd >= 0)
|
|
close (self->fd);
|
|
self->fd = -1;
|
|
self->descriptor = NULL;
|
|
return self;
|
|
}
|
|
|
|
|
|
int
|
|
lumiera_filehandle_get (LumieraFilehandle self)
|
|
{
|
|
REQUIRE (self->descriptor);
|
|
return -1;
|
|
}
|
|
|