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, coap_pdu_t *request,
24 unsigned char flags, void *data)
26 coap_async_state_t *s;
29 coap_transaction_id(peer, request, &id);
30 LL_SEARCH_SCALAR(context->async_state, s, id, id);
34 /* We must return NULL here as the caller must know that he is
35 * responsible for releasing @p data. */
36 debug("asynchronous state for transaction %d already registered\n", id);
40 /* store information for handling the asynchronous task */
41 s = (coap_async_state_t *) coap_malloc(sizeof(coap_async_state_t) +
42 request->hdr->coap_hdr_udp_t.token_length);
45 coap_log(LOG_CRIT, "coap_register_async: insufficient memory\n");
49 memset(s, 0, sizeof(coap_async_state_t) + request->hdr->coap_hdr_udp_t.token_length);
51 /* set COAP_ASYNC_CONFIRM according to request's type */
52 s->flags = flags & ~COAP_ASYNC_CONFIRM;
53 if (request->hdr->coap_hdr_udp_t.type == COAP_MESSAGE_CON)
54 s->flags |= COAP_ASYNC_CONFIRM;
58 memcpy(&s->peer, peer, sizeof(coap_address_t));
60 if (request->hdr->coap_hdr_udp_t.token_length)
62 s->tokenlen = request->hdr->coap_hdr_udp_t.token_length;
63 memcpy(s->token, request->hdr->coap_hdr_udp_t.token, request->hdr->coap_hdr_udp_t.token_length);
66 memcpy(&s->id, &id, sizeof(coap_tid_t));
70 LL_PREPEND(context->async_state, s);
76 coap_find_async(coap_context_t *context, coap_tid_t id)
78 coap_async_state_t *tmp;
79 LL_SEARCH_SCALAR(context->async_state, tmp, id, id);
83 int coap_remove_async(coap_context_t *context, coap_tid_t id, coap_async_state_t **s)
85 coap_async_state_t *tmp = coap_find_async(context, id);
88 LL_DELETE(context->async_state, tmp);
94 void coap_free_async(coap_async_state_t *s)
96 if (s && (s->flags & COAP_ASYNC_RELEASE_DATA) != 0)
97 coap_free(s->appdata);
102 void does_not_exist(); /* make some compilers happy */
103 #endif /* WITHOUT_ASYNC */