Function pbuf_alloc_reference

components/net/lwip/lwip-2.1.2/src/core/pbuf.c:326–341

* @ingroup pbuf * Allocates a pbuf for referenced data. * Referenced data can be volatile (PBUF_REF) or long-lived (PBUF_ROM). * * The actual memory allocated for the pbuf is determined by the * layer at which the pbuf is allocated and the requested size * (from the size parameter). * * @param payload referenced payload * @param length size of the pbuf's payload * @param type this parame

 * @return the allocated pbuf.
 */
struct pbuf *
pbuf_alloc_reference(void *payload, u16_t length, pbuf_type type)
{
  struct pbuf *p;
  LWIP_ASSERT("invalid pbuf_type", (type == PBUF_REF) || (type == PBUF_ROM));
  /* only allocate memory for the pbuf structure */
  p = (struct pbuf *)memp_malloc(MEMP_PBUF);
  if (p == NULL) {
    LWIP_DEBUGF(PBUF_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
                ("pbuf_alloc_reference: Could not allocate MEMP_PBUF for PBUF_%s.\n",
                 (type == PBUF_ROM) ? "ROM" : "REF"));
    return NULL;
  }
  pbuf_init_alloced_pbuf(p, payload, length, length, type, 0);
  return p;
}


#if LWIP_SUPPORT_CUSTOM_PBUF