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t_rcvuderr(3)							 t_rcvuderr(3)

NAME
       t_rcvuderr() - receive a unit data error indication

SYNOPSIS
DESCRIPTION
       The function is used in connectionless mode to receive information con‐
       cerning an error on a previously sent data unit. This  function	should
       only  be issued following a unit data error indication.	It informs the
       transport user that a data unit with a specific destination address and
       protocol	 options  produced  an	error.	The argument fd identifies the
       local transport	endpoint  through  which  the  error  report  will  be
       received.   uderr points to a type structure used to specify the proto‐
       col address, protocol options, and the nature of the  error  associated
       with the data unit sent through the transport endpoint specified by the
       fd parameter.  The structure has the following members:

       The type structure is defined in the or header file.   This  structure,
       which is used to define buffer parameters, has the following members:

       maximum byte length of the data buffer

       actual byte length of data written to buffer

       points to buffer location

       The  maxlen field of addr and opt must be set before calling this func‐
       tion to indicate the maximum size of the buffer for each.

       On return from this call, the addr structure specifies the  destination
       protocol	 address  of the erroneous data unit the opt structure identi‐
       fied protocol-specific options that were associated with the data  unit
       and error specifies a protocol dependent error code.

       If  the	user  does not care to identify the data unit that produced an
       error, uderr may be set to a null pointer, and will  simply  clear  the
       error indication without reporting any information to the user.

   Valid States
   Fork Safety
       is not fork-safe.

RETURN VALUE
       Upon  successful	 completion,  a	 value of 0 is returned.  Otherwise, a
       value of −1 is returned and is set to indicate the error.

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

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

       [TNOUDERR]	   No  unit  data error indication currently exists at
			   the specified transport endpoint.

       [TBUFOVFLW]	   The number of bytes allocated for the incoming pro‐
			   tocol  address or options information is not suffi‐
			   cient to store that	information.   The  unit  data
			   error  information  to be returned in uderr will be
			   discarded.

       [TNOTSUPPORT]	   This function is not supported  by  the  underlying
			   transport provider.

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

       [TPROTO]		   (XTI only) This error indicates that	 a  communica‐
			   tion	 problem has been detected between XTI and the
			   transport provider for  which  there	 is  no	 other
			   suitable XTI (

SEE ALSO
       t_look(3), t_rcvudata(3), t_sndudata(3), thread_safety(5).

STANDARDS CONFORMANCE
								 t_rcvuderr(3)

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