channel.c

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00001 /*
00002  * Copyright (c) 2007, Swedish Institute of Computer Science.
00003  * All rights reserved.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the Institute nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  *
00029  * This file is part of the Contiki operating system.
00030  *
00031  * $Id: channel.c,v 1.3 2010/06/15 19:22:25 adamdunkels Exp $
00032  */
00033 
00034 /**
00035  * \file
00036  *         Rime's channel abstraction
00037  * \author
00038  *         Adam Dunkels <adam@sics.se>
00039  */
00040 
00041 #include "net/rime/chameleon.h"
00042 #include "net/rime.h"
00043 #include "lib/list.h"
00044 
00045 LIST(channel_list);
00046 
00047 /*---------------------------------------------------------------------------*/
00048 void
00049 channel_init(void)
00050 {
00051   list_init(channel_list);
00052 }
00053 /*---------------------------------------------------------------------------*/
00054 void
00055 channel_set_attributes(uint16_t channelno,
00056                        const struct packetbuf_attrlist attrlist[])
00057 {
00058   struct channel *c;
00059   c = channel_lookup(channelno);
00060   if(c != NULL) {
00061     c->attrlist = attrlist;
00062     c->hdrsize = chameleon_hdrsize(attrlist);
00063   }
00064 }
00065 /*---------------------------------------------------------------------------*/
00066 void
00067 channel_open(struct channel *c, uint16_t channelno)
00068 {
00069   c->channelno = channelno;
00070   list_add(channel_list, c);
00071 }
00072 /*---------------------------------------------------------------------------*/
00073 void
00074 channel_close(struct channel *c)
00075 {
00076   list_remove(channel_list, c);
00077 }
00078 /*---------------------------------------------------------------------------*/
00079 struct channel *
00080 channel_lookup(uint16_t channelno)
00081 {
00082   struct channel *c;
00083   for(c = list_head(channel_list); c != NULL; c = list_item_next(c)) {
00084     if(c->channelno == channelno) {
00085       return c;
00086     }
00087   }
00088   return NULL;
00089 }
00090 /*---------------------------------------------------------------------------*/

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