mem.c
Go to the documentation of this file.
/* mem.c -- CoAP memory handling
*
* Copyright (C) 2014--2015 Olaf Bergmann <bergmann@tzi.org>
*
* This file is part of the CoAP library libcoap. Please see
* README for terms of use.
*/
#include "coap_config.h"
#include "mem.h"
#include "debug.h"
#ifdef HAVE_ASSERT_H
#include <assert.h>
#else /* HAVE_ASSERT_H */
#define assert(...)
#endif /* HAVE_ASSERT_H */
#ifdef HAVE_MALLOC
#include <stdlib.h>
void
coap_memory_init(void) {
}
#ifdef __GNUC__
#define UNUSED_PARAM __attribute__((unused))
#else
#define UNUSED_PARAM
#endif /* __GNUC__ */
void *
coap_malloc_type(coap_memory_tag_t type UNUSED_PARAM, size_t size) {
return malloc(size);
}
void
coap_free_type(coap_memory_tag_t type UNUSED_PARAM, void *p) {
free(p);
}
#else /* HAVE_MALLOC */
#ifdef WITH_CONTIKI
#define COAP_MAX_STRING_SIZE 12
#define COAP_MAX_STRINGS 8
struct coap_string_t {
char data[COAP_MAX_STRING_SIZE];
};
#include "coap_config.h"
#include "net.h"
#include "pdu.h"
#include "coap_io.h"
#include "resource.h"
#define COAP_MAX_PACKET_SIZE (sizeof(coap_packet_t) + COAP_MAX_PDU_SIZE)
#define COAP_MAX_PACKETS 2
typedef union {
coap_pdu_t packet; /* try to convince the compiler to word-align this structure */
char buf[COAP_MAX_PACKET_SIZE];
} coap_packetbuf_t;
MEMB(string_storage, struct coap_string_t, COAP_MAX_STRINGS);
MEMB(packet_storage, coap_packetbuf_t, COAP_MAX_PACKETS);
MEMB(node_storage, coap_queue_t, COAP_PDU_MAXCNT);
MEMB(pdu_storage, coap_pdu_t, COAP_PDU_MAXCNT);
MEMB(pdu_buf_storage, coap_packetbuf_t, COAP_PDU_MAXCNT);
MEMB(resource_storage, coap_resource_t, COAP_MAX_RESOURCES);
MEMB(attribute_storage, coap_attr_t, COAP_MAX_ATTRIBUTES);
static struct memb *
get_container(coap_memory_tag_t type) {
switch(type) {
case COAP_PACKET: return &packet_storage;
case COAP_NODE: return &node_storage;
case COAP_PDU: return &pdu_storage;
case COAP_PDU_BUF: return &pdu_buf_storage;
case COAP_RESOURCE: return &resource_storage;
case COAP_RESOURCEATTR: return &attribute_storage;
default:
return &string_storage;
}
}
void
coap_memory_init(void) {
memb_init(&string_storage);
memb_init(&packet_storage);
memb_init(&node_storage);
memb_init(&pdu_storage);
memb_init(&pdu_buf_storage);
memb_init(&resource_storage);
memb_init(&attribute_storage);
}
void *
coap_malloc_type(coap_memory_tag_t type, size_t size) {
struct memb *container = get_container(type);
assert(container);
if (size > container->size) {
debug("coap_malloc_type: Requested memory exceeds maximum object size\n");
return NULL;
}
return memb_alloc(container);
}
void
coap_free_type(coap_memory_tag_t type, void *object) {
memb_free(get_container(type), object);
}
#endif /* WITH_CONTIKI */
#endif /* HAVE_MALLOC */
mem.h
net.h
debug.h
COAP_RESOURCEATTR
Definition: mem.h:40
coap_resource_t
Definition: resource.h:75
debug
#define debug(...)
Definition: debug.h:66
coap_memory_tag_t
coap_memory_tag_t
Type specifiers for coap_malloc_type().
Definition: mem.h:29
coap_pdu_t
Header structure for CoAP PDUs.
Definition: pdu.h:227
COAP_PDU_BUF
Definition: mem.h:38
assert
#define assert(...)
Definition: mem.c:17
UNUSED_PARAM
#define UNUSED_PARAM
Definition: coap_io.c:245
COAP_PACKET
Definition: mem.h:33
resource.h
Generic resource handling.
coap_attr_t
Definition: resource.h:53
pdu.h
Pre-defined constants that reflect defaults for CoAP.
coap_io.h
COAP_RESOURCE
Definition: mem.h:39
coap_malloc_type
void * coap_malloc_type(coap_memory_tag_t type, size_t size)
Allocates a chunk of size bytes and returns a pointer to the newly allocated memory.
coap_memory_init
void coap_memory_init(void)
Initializes libcoap&#39;s memory management.
coap_address_t::size
socklen_t size
size of addr
Definition: address.h:60
coap_free_type
void coap_free_type(coap_memory_tag_t type, void *p)
Releases the memory that was allocated by coap_malloc_type().
COAP_NODE
Definition: mem.h:34
COAP_PDU
Definition: mem.h:37
coap_queue_t
Definition: net.h:31