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t_look(3)							     t_look(3)

NAME
       t_look() - look at the current event on a transport endpoint

SYNOPSIS
DESCRIPTION
       The function returns the current event on the transport endpoint speci‐
       fied by fd.  This function enables a transport  provider	 to  notify  a
       transport  user of an asynchronous event when the user is calling func‐
       tions in synchronous mode.  Certain events require immediate  notifica‐
       tion of the user and are indicated by a specific error, [TLOOK], on the
       current or next function to be executed.

       This function also enables a transport user to poll  a  transport  end‐
       point periodically for asynchronous events.

   Valid States
       All  - apart from

XTI Internet Protocol-specific Information
       As  soon	 as  a	segment with the TCP urgent pointer set enters the TCP
       receive buffer, the event is indicated.	remains set until all data  up
       to the byte pointed to by the TCP urgent pointer has been received.  If
       the urgent pointer is updated, and the user has not  yet	 received  the
       byte  previously pointed to by the urgent pointer, the update is trans‐
       parent to the user.

   Fork Safety
       is not fork-safe.

RETURN VALUE
       Upon success, returns a value that indicates  which  of	the  following
       allowable events has occurred, or returns zero if no event exists.  One
       of the following events is returned:

       T_LISTEN		  connection indication received.

       T_CONNECT	  connect confirmation received.

       T_DATA		  normal data received.

       T_ERROR		  (TLI ONLY) fatal error occurred.

       T_EXDATA		  expedited data received.

       T_DISCONNECT	  disconnect received.

       T_UDERR		  datagram error indication.

       T_ORDREL		  orderly release indication.

       T_GODATA		  (XTI only) flow control restrictions on normal  data
			  flow	have  been  lifted.   Normal  data may be sent
			  again.

       T_GOEXDATA	  (XTI only) flow control  restrictions	 on  expedited
			  data	flow  have been lifted.	 Expedited data may be
			  sent again.

ERRORS
       On failure, is set to one of the following:

       [TBADF]		The specified identifier does not refer to a transport
			endpoint.

       [TSYSERR]	A  system  error has occurred during execution of this
			function.

       [TPROTO]		(XTI only) This error indicates that  a	 communication
			problem	 has  been detected between XTI and the trans‐
			port provider for which there is no suitable XTI (

SEE ALSO
       t_open(3), t_snd(3), t_sndudata(3), thread_safety(5).

STANDARDS CONFORMANCE
								     t_look(3)

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