}      else	{	  if (0 == strcmp (evt->sip->cseq->method, "INVITE")	      || 0 == strcmp (evt->sip->cseq->method, "ACK"))	    {	      transactions = osip->ict_transactions;#ifdef OSIP_MT	      mut = ict_fastmutex;#endif	    }	  else	    {	      transactions = osip->nict_transactions;#ifdef OSIP_MT	      mut = nict_fastmutex;#endif	    }	}    }  else if (EVT_IS_OUTGOINGMSG (evt))    {      if (MSG_IS_RESPONSE (evt->sip))	{	  if (0 == strcmp (evt->sip->cseq->method, "INVITE")	      || 0 == strcmp (evt->sip->cseq->method, "ACK"))	    {	      transactions = osip->ist_transactions;#ifdef OSIP_MT	      mut = ist_fastmutex;#endif	    }	  else	    {	      transactions = osip->nist_transactions;#ifdef OSIP_MT	      mut = nist_fastmutex;#endif	    }	}      else	{	  if (0 == strcmp (evt->sip->cseq->method, "INVITE")	      || 0 == strcmp (evt->sip->cseq->method, "ACK"))	    {	      transactions = osip->ict_transactions;#ifdef OSIP_MT	      mut = ict_fastmutex;#endif	    }	  else	    {	      transactions = osip->nict_transactions;#ifdef OSIP_MT	      mut = nict_fastmutex;#endif	    }	}    }  if (transactions == NULL)    return NULL;		/* not a message??? */#ifdef OSIP_MT  smutex_lock (mut);#endif  transaction = osip_transaction_find (transactions, evt);  if (consume == 1)    {				/* we add the event before releasing the mutex!! */      if (transaction != NULL)	{	  transaction_add_event (transaction, evt);#ifdef OSIP_MT	  smutex_unlock (mut);#endif	  return transaction;	}    }#ifdef OSIP_MT  smutex_unlock (mut);#endif  return transaction;}transaction_t *osip_create_transaction (osip_t * osip, sipevent_t * evt){  transaction_t *transaction;  int i;  context_type_t ctx_type;  if (evt==NULL)    return NULL;  if (evt->sip==NULL)    return NULL;  /* make sure the request's method reflect the cseq value. */  if (MSG_IS_REQUEST (evt->sip))    {      /* delete request where cseq method does not match	 the method in request-line */      if (evt->sip->cseq==NULL || evt->sip->strtline==NULL	  || evt->sip->cseq->method==NULL || evt->sip->strtline->sipmethod==NULL)	{	  return NULL;	}      if (0 != strcmp (evt->sip->cseq->method, evt->sip->strtline->sipmethod))	{	  OSIP_TRACE (osip_trace		      (__FILE__, __LINE__, OSIP_WARNING, NULL,		       "core module: Discard invalid message with method!=cseq!\n"));	  return NULL;	}    }  if (MSG_IS_ACK (evt->sip)) /* ACK never create transactions */    return NULL;  if (EVT_IS_INCOMINGREQ (evt))    {      /* we create a new context for this incoming request */      if (0 == strcmp (evt->sip->cseq->method, "INVITE"))	ctx_type = IST;      else	ctx_type = NIST;    }  else if (EVT_IS_OUTGOINGREQ (evt))    {      if (0 == strcmp (evt->sip->cseq->method, "INVITE"))	ctx_type = ICT;      else	ctx_type = NICT;    }  else    {      OSIP_TRACE (osip_trace		  (__FILE__, __LINE__, OSIP_ERROR, NULL,		   "Cannot build a transction for this message!\n"));      return NULL;    }  i = transaction_init (&transaction, ctx_type, osip, evt->sip);  if (i == -1)    {      return NULL;    }  evt->transactionid = transaction->transactionid;  return transaction;}transaction_t *osip_transaction_find (list_t * transactions, sipevent_t * evt){  int pos = 0;  transaction_t *transaction;  if (EVT_IS_INCOMINGREQ (evt))    {      while (!list_eol (transactions, pos))	{	  transaction = (transaction_t *) list_get (transactions, pos);	  if (0 ==	      transaction_matching_request_to_xist_17_2_3 (transaction,							   evt->sip))	    return transaction;	  pos++;	}    }  else if (EVT_IS_INCOMINGRESP (evt))    {      while (!list_eol (transactions, pos))	{	  transaction = (transaction_t *) list_get (transactions, pos);	  if (0 ==	      transaction_matching_response_to_xict_17_1_3 (transaction,							    evt->sip))	    return transaction;	  pos++;	}    }  else				/* handle OUTGOING message */    {				/* THE TRANSACTION ID MUST BE SET */      while (!list_eol (transactions, pos))	{	  transaction = (transaction_t *) list_get (transactions, pos);	  if (transaction->transactionid == evt->transactionid)	    return transaction;	  pos++;	}    }  return NULL;}intosip_init (osip_t ** osip){  *osip = (osip_t *) smalloc (sizeof (osip_t));  if (*osip == NULL)    return -1;			/* allocation failed */#ifndef DISABLE_MEMSET  memset (*osip, 0, sizeof (osip_t));#else  (*osip)->cb_ict_kill_transaction = NULL;  (*osip)->cb_ict_invite_sent = NULL;  (*osip)->cb_ict_invite_sent2 = NULL;  (*osip)->cb_ict_ack_sent = NULL;  (*osip)->cb_ict_ack_sent2 = NULL;  (*osip)->cb_ict_1xx_received = NULL;  (*osip)->cb_ict_2xx_received = NULL;  (*osip)->cb_ict_2xx_received2 = NULL;  (*osip)->cb_ict_3456xx_received = NULL;  (*osip)->cb_ict_3456xx_received2 = NULL;  (*osip)->cb_ict_transport_error = NULL;  /* callbacks for ist */  (*osip)->cb_ist_kill_transaction = NULL;  (*osip)->cb_ist_invite_received = NULL;  (*osip)->cb_ist_invite_received2 = NULL;  (*osip)->cb_ist_ack_received = NULL;  (*osip)->cb_ist_ack_received2 = NULL;  (*osip)->cb_ist_1xx_sent = NULL;  (*osip)->cb_ist_1xx_sent2 = NULL;  (*osip)->cb_ist_2xx_sent = NULL;  (*osip)->cb_ist_2xx_sent2 = NULL;  (*osip)->cb_ist_3456xx_sent = NULL;  (*osip)->cb_ist_3456xx_sent2 = NULL;  (*osip)->cb_ist_transport_error = NULL;  /* callbacks for nict */  (*osip)->cb_nict_kill_transaction = NULL;  (*osip)->cb_nict_register_sent = NULL;  (*osip)->cb_nict_bye_sent = NULL;  (*osip)->cb_nict_options_sent = NULL;  (*osip)->cb_nict_info_sent = NULL;  (*osip)->cb_nict_cancel_sent = NULL;  (*osip)->cb_nict_notify_sent = NULL;  (*osip)->cb_nict_subscribe_sent = NULL;  (*osip)->cb_nict_unknown_sent = NULL;  (*osip)->cb_nict_request_sent2 = NULL;  (*osip)->cb_nict_1xx_received = NULL;  (*osip)->cb_nict_2xx_received = NULL;  (*osip)->cb_nict_2xx_received2 = NULL;  (*osip)->cb_nict_3456xx_received = NULL;  (*osip)->cb_nict_3456xx_received2 = NULL;  (*osip)->cb_nict_transport_error = NULL;  /* callbacks for nist */  (*osip)->cb_nist_kill_transaction = NULL;  (*osip)->cb_nist_register_received = NULL;  (*osip)->cb_nist_bye_received = NULL;  (*osip)->cb_nist_options_received = NULL;  (*osip)->cb_nist_info_received = NULL;  (*osip)->cb_nist_cancel_received = NULL;  (*osip)->cb_nist_notify_received = NULL;  (*osip)->cb_nist_subscribe_received = NULL;  /* ... TO BE ADDED: All known and used method extansions */  (*osip)->cb_nist_unknown_received = NULL;  (*osip)->cb_nist_request_received2 = NULL;  (*osip)->cb_nist_1xx_sent = NULL;  (*osip)->cb_nist_2xx_sent = NULL;  (*osip)->cb_nist_2xx_sent2 = NULL;  (*osip)->cb_nist_3456xx_sent = NULL;  (*osip)->cb_nist_3456xx_sent2 = NULL;  (*osip)->cb_nist_transport_error = NULL;#endif  (*osip)->ict_transactions = (list_t *) smalloc (sizeof (list_t));  list_init ((*osip)->ict_transactions);  (*osip)->ist_transactions = (list_t *) smalloc (sizeof (list_t));  list_init ((*osip)->ist_transactions);  (*osip)->nict_transactions = (list_t *) smalloc (sizeof (list_t));  list_init ((*osip)->nict_transactions);  (*osip)->nist_transactions = (list_t *) smalloc (sizeof (list_t));  list_init ((*osip)->nist_transactions);  return 0;}voidosip_free (osip_t * osip){  sfree (osip->ict_transactions);  sfree (osip->ist_transactions);  sfree (osip->nict_transactions);  sfree (osip->nist_transactions);}voidosip_set_application_context (osip_t * osip, void *pointer){  osip->application_context = pointer;}void *osip_get_application_context (osip_t * osip){  if (osip == NULL)    return NULL;  return osip->application_context;}intosip_ict_execute (osip_t * osip){  transaction_t *transaction;  sipevent_t *se;  int more_event;  int tr;  tr = 0;  while (!list_eol (osip->ict_transactions, tr))    {      transaction = list_get (osip->ict_transactions, tr);      tr++;      more_event = 1;      do	{	  se = (sipevent_t *) fifo_tryget (transaction->transactionff);	  if (se == NULL)	/* no more event for this transaction */	    more_event = 0;	  else	    transaction_execute (transaction, se);	}      while (more_event == 1);    }  return 0;}intosip_ist_execute (osip_t * osip){  transaction_t *transaction;  sipevent_t *se;  int more_event;  int tr;  tr = 0;  while (!list_eol (osip->ist_transactions, tr))    {      transaction = list_get (osip->ist_transactions, tr);      tr++;      more_event = 1;      do	{	  se = (sipevent_t *) fifo_tryget (transaction->transactionff);	  if (se == NULL)	/* no more event for this transaction */	    more_event = 0;	  else	    transaction_execute (transaction, se);	}      while (more_event == 1);    }  return 0;}intosip_nict_execute (osip_t * osip){  transaction_t *transaction;  sipevent_t *se;  int more_event;  int tr;  tr = 0;  while (!list_eol (osip->nict_transactions, tr))    {      transaction = list_get (osip->nict_transactions, tr);      tr++;      more_event = 1;      do	{	  se = (sipevent_t *) fifo_tryget (transaction->transactionff);	  if (se == NULL)	/* no more event for this transaction */	    more_event = 0;	  else	    transaction_execute (transaction, se);	}      while (more_event == 1);    }  return 0;}intosip_nist_execute (osip_t * osip){  transaction_t *transaction;  sipevent_t *se;  int more_event;  int tr;  tr = 0;  while (!list_eol (osip->nist_transactions, tr))    {      transaction = list_get (osip->nist_transactions, tr);      tr++;      more_event = 1;      do	{	  se = (sipevent_t *) fifo_tryget (transaction->transactionff);	  if (se == NULL)	/* no more event for this transaction */	    more_event = 0;	  else	    transaction_execute (transaction, se);	}      while (more_event == 1);    }  return 0;}voidosip_timers_ict_execute (osip_t * osip){  transaction_t *tr;  int pos = 0;#ifdef OSIP_MT  smutex_lock (ict_fastmutex);#endif  /* handle ict timers */  while (!list_eol (osip->ict_transactions, pos))    {      sipevent_t *evt;      tr = (transaction_t *) list_get (osip->ict_transactions, pos);      if (1 <= fifo_size (tr->transactionff))	{	  OSIP_TRACE (osip_trace		      (__FILE__, __LINE__, OSIP_INFO4, NULL,		       "1 Pending event already in transaction !\n"));	}      else	{	  evt =	    ict_need_timer_b_event (tr->ict_context, tr->state,				    tr->transactionid);	  if (evt != NULL)	    fifo_add (tr->transactionff, evt);	  else	    {	      evt =		ict_need_timer_a_event (tr->ict_context, tr->state,					tr->transactionid);	      if (evt != NULL)		fifo_add (tr->transactionff, evt);	      else		{		  evt = ict_need_timer_d_event (tr->ict_context, tr->state,						tr->transactionid);		  if (evt != NULL)		    fifo_add (tr->transactionff, evt);		}	    }	}      pos++;    }#ifdef OSIP_MT  smutex_unlock (ict_fastmutex);#endif}voidosip_timers_ist_execute (osip_t * osip){  transaction_t *tr;  int pos = 0;#ifdef OSIP_MT  smutex_lock (ist_fastmutex);#endif  /* handle ist timers */  while (!list_eol (osip->ist_transactions, pos))    {      sipevent_t *evt;      tr = (transaction_t *) list_get (osip->ist_transactions, pos);      evt =	ist_need_timer_i_event (tr->ist_context, tr->state,				tr->transactionid);      if (evt != NULL)	fifo_add (tr->transactionff, evt);      else	{	  evt = ist_need_timer_h_event (tr->ist_context, tr->state,					tr->transactionid);	  if (evt != NULL)	    fifo_add (tr->transactionff, evt);	  else	    {	      evt = ist_need_timer_g_event (tr->ist_context, tr->state,					    tr->transactionid);	      if (evt != NULL)		fifo_add (tr->transactionff, evt);	    }	}      pos++;    }#ifdef OSIP_MT  smutex_unlock (ist_fastmutex);#endif}voidosip_timers_nict_execute (osip_t * osip){  transaction_t *tr;  int pos = 0;#ifdef OSIP_MT  smutex_lock (nict_fastmutex);#endif