contiki/core/sys/service.c

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/*
* Copyright (c) 2005, 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: service.c,v 1.1 2006/06/17 22:41:20 adamdunkels Exp $
*/
#include <string.h>
#include "contiki.h"
/**
* \addtogroup service
* @{
*/
/**
* \file
* Implementation of the Contiki service mechanism.
* \author
* Adam Dunkels <adam@sics.se>
*/
static struct service *services_list = NULL;
/*---------------------------------------------------------------------------*/
void
service_register(struct service *s)
{
struct service *existing;
s->p = PROCESS_CURRENT();
existing = service_find(s->name);
if(existing != NULL) {
service_remove(existing);
}
s->next = services_list;
services_list = s;
}
/*---------------------------------------------------------------------------*/
void
service_remove(struct service *s)
{
struct service *t;
/* Check if service is first on the list. */
if(s == services_list) {
services_list = s->next;
/* Post a notification to the owner process. */
process_post(s->p, PROCESS_EVENT_SERVICE_REMOVED, s);
} else {
for(t = services_list; t != NULL && t->next != s; t = t->next);
if(t != NULL) {
t->next = s->next;
/* Post a notification to the owner process. */
process_post(s->p, PROCESS_EVENT_SERVICE_REMOVED, s);
}
}
s->next = NULL;
}
/*---------------------------------------------------------------------------*/
struct service *
service_find(const char *name)
{
struct service *s;
for(s = services_list; s != NULL; s = s->next) {
if(strcmp(s->name, name) == 0) {
return s;
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
/** @} */