1 /* async.c -- state management for asynchronous messages
3 * Copyright (C) 2010,2011 Olaf Bergmann <bergmann@tzi.org>
5 * This file is part of the CoAP library libcoap. Please see
6 * README for terms of use.
11 * @brief state management for asynchronous messages
16 #include "include/coap/config.h"
17 #include "include/coap/utlist.h"
18 #include "include/coap/mem.h"
19 #include "include/coap/debug.h"
20 #include "include/coap/async.h"
23 coap_register_async(coap_context_t *context, coap_address_t *peer,
24 coap_pdu_t *request, unsigned char flags, void *data) {
25 coap_async_state_t *s;
28 coap_transaction_id(peer, request, &id);
29 LL_SEARCH_SCALAR(context->async_state, s, id, id);
32 /* We must return NULL here as the caller must know that he is
33 * responsible for releasing @p data. */
34 debug("asynchronous state for transaction %d already registered\n", id);
38 /* store information for handling the asynchronous task */
39 s = (coap_async_state_t *) coap_malloc(sizeof(coap_async_state_t) +
40 request->transport_hdr->udp.token_length);
42 coap_log(LOG_CRIT, "coap_register_async: insufficient memory\n");
46 memset(s, 0, sizeof(coap_async_state_t) + request->transport_hdr->udp.token_length);
48 /* set COAP_ASYNC_CONFIRM according to request's type */
49 s->flags = flags & ~COAP_ASYNC_CONFIRM;
50 if (request->transport_hdr->udp.type == COAP_MESSAGE_CON)
51 s->flags |= COAP_ASYNC_CONFIRM;
55 memcpy(&s->peer, peer, sizeof(coap_address_t));
57 if (request->transport_hdr->udp.token_length) {
58 s->tokenlen = request->transport_hdr->udp.token_length;
59 memcpy(s->token, request->transport_hdr->udp.token, request->transport_hdr->udp.token_length);
62 memcpy(&s->id, &id, sizeof(coap_tid_t));
66 LL_PREPEND(context->async_state, s);
72 coap_find_async(coap_context_t *context, coap_tid_t id) {
73 coap_async_state_t *tmp;
74 LL_SEARCH_SCALAR(context->async_state, tmp, id, id);
79 coap_remove_async(coap_context_t *context, coap_tid_t id, coap_async_state_t **s) {
80 coap_async_state_t *tmp = coap_find_async(context, id);
83 LL_DELETE(context->async_state, tmp);
90 coap_free_async(coap_async_state_t *s) {
91 if (s && (s->flags & COAP_ASYNC_RELEASE_DATA) != 0)
92 coap_free(s->appdata);
97 void does_not_exist(); /* make some compilers happy */
98 #endif /* WITHOUT_ASYNC */