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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.
*/
/*
* Definitions of a simple wrapper that can be used to protect oskit_asyncio
* interfaces.
*/
#include <oskit/io/asyncio.h>
#include <oskit/com/wrapper.h>
#include <oskit/c/stdlib.h>
typedef struct {
oskit_asyncio_t ioi; /* COM interface being exported */
int count; /* reference count */
oskit_asyncio_t *wrapped; /* COM interface being wrapped */
void (*before)(void *);
void (*after)(void *);
void *cookie;
} asynciowrap_impl_t;
#define WRAPPERCALL(impl, call, args...) ({ \
oskit_error_t __err; \
impl->before(impl->cookie); \
__err = oskit_asyncio_##call(impl->wrapped ,##args); \
impl->after(impl->cookie); \
__err; })
#define WRAPPERCALL_NOARGS(impl, call) ({ \
oskit_error_t __err; \
impl->before(impl->cookie); \
__err = oskit_asyncio_##call(impl->wrapped); \
impl->after(impl->cookie); \
__err; })
static OSKIT_COMDECL
asyncio_query(oskit_asyncio_t *f, const struct oskit_guid *iid,
void **out_ihandle)
{
asynciowrap_impl_t *b = (asynciowrap_impl_t *)f;
if (memcmp(iid, &oskit_iunknown_iid, sizeof(*iid)) == 0 ||
memcmp(iid, &oskit_asyncio_iid, sizeof(*iid)) == 0) {
*out_ihandle = &b->ioi;
b->before(b->cookie);
++b->count;
b->after(b->cookie);
return 0;
}
*out_ihandle = NULL;
return OSKIT_E_NOINTERFACE;
}
static OSKIT_COMDECL_U
asyncio_addref(oskit_asyncio_t *f)
{
asynciowrap_impl_t *b = (asynciowrap_impl_t *)f;
unsigned newcount;
b->before(b->cookie);
newcount = ++b->count;
b->after(b->cookie);
return newcount;
}
static OSKIT_COMDECL_U
asyncio_release(oskit_asyncio_t *f)
{
asynciowrap_impl_t *b = (asynciowrap_impl_t *)f;
unsigned newcount;
b->before(b->cookie);
if ((newcount = --b->count) == 0) {
oskit_asyncio_release(b->wrapped);
b->after(b->cookie);
free(b);
} else
b->after(b->cookie);
return newcount;
}
/*******************************************************/
/******* Implementation of the oskit_asyncio_t if *******/
/*******************************************************/
static OSKIT_COMDECL
asyncio_poll(oskit_asyncio_t *f)
{
asynciowrap_impl_t *si = (asynciowrap_impl_t *)f;
oskit_error_t err;
err = WRAPPERCALL_NOARGS(si, poll);
return err;
}
static OSKIT_COMDECL
asyncio_add_listener(oskit_asyncio_t *f, struct oskit_listener *l,
oskit_s32_t mask)
{
asynciowrap_impl_t *si = (asynciowrap_impl_t *)f;
oskit_error_t err;
err = WRAPPERCALL(si, add_listener, l, mask);
return err;
}
static OSKIT_COMDECL
asyncio_remove_listener(oskit_asyncio_t *f, struct oskit_listener *l0)
{
asynciowrap_impl_t *si = (asynciowrap_impl_t *)f;
oskit_error_t err;
err = WRAPPERCALL(si, remove_listener, l0);
return err;
}
/*
* return the number of bytes that can be read, basically ioctl(FIONREAD)
*/
static OSKIT_COMDECL
asyncio_readable(oskit_asyncio_t *f)
{
asynciowrap_impl_t *si = (asynciowrap_impl_t *)f;
oskit_error_t err;
err = WRAPPERCALL_NOARGS(si, readable);
return err;
}
/***************************************************************************/
/*
* vtables for interfaces exported by streams
*/
static struct oskit_asyncio_ops asyncioops =
{
asyncio_query,
asyncio_addref,
asyncio_release,
asyncio_poll,
asyncio_add_listener,
asyncio_remove_listener,
asyncio_readable
};
/*
* Wrap a asyncio_t in before/after brackets.
*/
oskit_error_t
oskit_wrap_asyncio(oskit_asyncio_t *in,
void (*before)(void *), void (*after)(void *), void *cookie,
oskit_asyncio_t **out)
{
asynciowrap_impl_t *newsi = malloc(sizeof(*newsi));
if (newsi == NULL)
return OSKIT_ENOMEM;
newsi->count = 1;
newsi->ioi.ops = &asyncioops;
newsi->wrapped = in;
oskit_asyncio_addref(in);
newsi->before = before;
newsi->after = after;
newsi->cookie = cookie;
*out = &newsi->ioi;
return 0;
}
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