nes-proj/core/net/rime/channel.c

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/*
* Copyright (c) 2007, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
* $Id: channel.c,v 1.2 2009/03/12 21:58:20 adamdunkels Exp $
*/
/**
* \file
* Rime's channel abstraction
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "net/rime/chameleon.h"
#include "net/rime.h"
#include "lib/list.h"
LIST(channel_list);
/*---------------------------------------------------------------------------*/
void
channel_init(void)
{
list_init(channel_list);
}
/*---------------------------------------------------------------------------*/
void
channel_set_attributes(uint16_t channelno,
const struct packetbuf_attrlist attrlist[])
{
struct channel *c;
c = channel_lookup(channelno);
if(c != NULL) {
c->attrlist = attrlist;
c->hdrsize = chameleon_hdrsize(attrlist);
}
}
/*---------------------------------------------------------------------------*/
void
channel_open(struct channel *c, uint16_t channelno)
{
c->channelno = channelno;
list_add(channel_list, c);
}
/*---------------------------------------------------------------------------*/
void
channel_close(struct channel *c)
{
list_remove(channel_list, c);
}
/*---------------------------------------------------------------------------*/
struct channel *
channel_lookup(uint16_t channelno)
{
struct channel *c;
for(c = list_head(channel_list); c != NULL; c = c->next) {
if(c->channelno == channelno) {
return c;
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/