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/*
* Copyright (c) 1997-1998 University of Utah and the Flux Group.
* All rights reserved.
*
* This file is part of the Flux OSKit. The OSKit is free software, also known
* as "open source;" you can redistribute it and/or modify it under the terms
* of the GNU General Public License (GPL), version 2, as published by the Free
* Software Foundation (FSF). To explore alternate licensing terms, contact
* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
*
* The OSKit 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 GPL for more details. You should have
* received a copy of the GPL along with the OSKit; see the file COPYING. If
* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
*/
/*
* Simple object adapter implementing trivial oskit_file_t
* objects based on a magic open function that's passed in
*/
#include <oskit/fs/soa.h>
#include <oskit/fs/file.h>
#include <oskit/dev/dev.h>
#include <assert.h>
#include <errno.h>
#include <malloc.h>
#include <fcntl.h>
#include <string.h>
#ifndef VERBOSITY
#define VERBOSITY 0
#endif
#if VERBOSITY > 20
#define DMARK printf(__FILE__ ":%d: " __FUNCTION__ "\n", __LINE__)
#else
#define DMARK ((void)0) /* no-op */
#endif
typedef OSKIT_COMDECL (*open_function_t)
(oskit_file_t *, void *, oskit_oflags_t, oskit_openfile_t **out);
typedef OSKIT_COMDECL_V (*close_function_t)(void *);
/*
* Structure describing an universal file adapter object
*/
typedef struct universal_file {
oskit_file_t filei; /* COM interface */
oskit_u32_t count; /* reference count */
open_function_t open; /* function called on open */
close_function_t close;
void *cookie;
struct oskit_stat stat;
} universal_file_t;
static OSKIT_COMDECL
universal_query(oskit_file_t *ff, const oskit_iid_t *iid, void **out_ihandle)
{
struct universal_file *f = (struct universal_file *)ff;
assert(f->count);
if (memcmp(iid, &oskit_iunknown_iid, sizeof(*iid)) == 0 ||
memcmp(iid, &oskit_file_iid, sizeof(*iid)) == 0) {
*out_ihandle = f;
++f->count;
return 0;
}
*out_ihandle = NULL;
return OSKIT_E_NOINTERFACE;
}
static OSKIT_COMDECL_U
universal_addref(oskit_file_t *ff)
{
struct universal_file *f = (struct universal_file *)ff;
assert (f->count);
return ++f->count;
}
static OSKIT_COMDECL_U
universal_release(oskit_file_t *ff)
{
struct universal_file *f = (struct universal_file *)ff;
assert(f->count);
if (--f->count)
return f->count;
f->close(f->cookie);
sfree(f, sizeof *f);
return 0;
}
/*** Operations inherited from oskit_posixio_t ***/
static OSKIT_COMDECL
universal_stat(oskit_file_t *file, struct oskit_stat *st)
{
struct universal_file *f = (void *) file;
*st = f->stat;
return 0;
}
static OSKIT_COMDECL
no_setstat(oskit_file_t *f, oskit_u32_t mask, const struct oskit_stat *stats)
{
return OSKIT_E_NOTIMPL;
}
static OSKIT_COMDECL
no_pathconf(oskit_file_t *f, oskit_s32_t option, oskit_s32_t *out_val)
{
return OSKIT_E_NOTIMPL;
}
static OSKIT_COMDECL
universal_sync(oskit_file_t *f, oskit_bool_t wait)
{
return 0; /* another call back ? */
}
static OSKIT_COMDECL
universal_datasync(oskit_file_t *f, oskit_bool_t wait)
{
return 0; /* another call back ? */
}
static OSKIT_COMDECL
universal_access(oskit_file_t *f, oskit_amode_t mask)
{
/* Sure, access me big boy. */
return 0;
}
static OSKIT_COMDECL
no_readlink(oskit_file_t *f, char *buf, oskit_u32_t len,
oskit_u32_t *out_actual)
{
return OSKIT_E_NOTIMPL;
}
static OSKIT_COMDECL
universal_open(oskit_file_t *file, oskit_oflags_t flags,
struct oskit_openfile **out_openfile)
{
struct universal_file *f = (void *) file;
return f->open(file, f->cookie, flags, out_openfile);
}
static OSKIT_COMDECL
universal_getfs(oskit_file_t *f, struct oskit_filesystem **out_fs)
{
return OSKIT_E_NOTIMPL; /* XXX implement? */
}
/*
* file vtable
*/
static struct oskit_file_ops universal_file_ops = {
universal_query,
universal_addref,
universal_release,
universal_stat,
no_setstat,
no_pathconf,
universal_sync,
universal_datasync,
universal_access,
no_readlink,
universal_open,
universal_getfs
};
OSKIT_COMDECL
oskit_soa_file_universal(
open_function_t open,
close_function_t close,
void *cookie,
struct oskit_stat *stat,
oskit_file_t **out_file)
{
struct universal_file *new;
new = smalloc(sizeof *new);
if (! new)
return OSKIT_ENOMEM;
new->filei.ops = &universal_file_ops;
new->count = 1;
new->open = open;
new->close = close;
new->cookie = cookie;
new->stat = *stat;
*out_file = &new->filei;
return 0;
}
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