t_rcvuderr(3) Library Functions Manual t_rcvuderr(3)
NAME
t_rcvuderr() - receive a unit data error indication
SYNOPSIS
DESCRIPTION
The function is used in connectionless mode to receive information concerning 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 protocol 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 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 iden-
tified 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 protocol address or options information is not sufficient 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 communication 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)
