t_rcvuderr(3N)

NAME
     t_rcvuderr - receive a unit data error indication

SYNOPSIS
     #ifdef _XOPEN_SOURCE
     #include <xti.h>
     #else
     #include <tiuser.h>
     #endif

     int t_rcvuderr (int fd, struct t_uderr *uderr);

DESCRIPTION
     This function is used in connectionless mode to receive information
     concerning an error on a previously sent data unit, and should be issued
     only after 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.  fd identifies the local transport endpoint through
     which the error report will be received, and uderr points to a t_uderr
     structure containing the following members:

          struct netbuf addr;
          struct netbuf opt;
          long error;

     netbuf is described in intro(3N).  The maxlen [see netbuf in intro(3N)]
     field of addr and opt must be set before issuing this function 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 identifies
     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 NULL and t_rcvuderr will simply clear the
     error indication without reporting any information to the user.

     This function resides within both the X/Open compliant libxnet and the
     SVR4 compliant libnsl Network Services libraries.  Network Services
     applications which require X/Open compliance must link-load with -lxnet.
     Network Services applications which require SVR4 compliance must link-
     load with -lnsl.

     On failure, t_errno may be 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 on the
                       specified transport endpoint.
     TBUFOVFLW         There are two different conditions in which TBUFOVFLW
                       will be returned.  If _XOPEN_SOURCE is defined and the
                       number of bytes allocated for incoming data is greater
                       than zero and is not sufficient to store the data.  If
                       _XOPEN_SOURCE is not defined and the number of bytes
                       allocated for incoming data is not sufficient to store
                       the data.  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 has occurred during execution of this
                       function.

SEE ALSO
     intro(3N), t_rcvudata(3N), t_sndudata(3N)

DIAGNOSTICS
     t_rcvuderr returns 0 on successful completion and -1 on failure and
     t_errno is set to indicate the error.