HP-UX Reference (11i v3 07/02) - 3 Library Functions N-Z (vol 7)

t
t_rcvuderr(3) t_rcvuderr(3)
NAME
t_rcvuderr() - receive a unit data error indication
SYNOPSIS
#include <xti.h> /* for X/OPEN Transport Interface - XTI */
/* or */
#include <tiuser.h> /* for Transport Layer Interface - TLI */
int t_rcvuderr (fd, uderr);
int fd;
struct t_uderr *uderr;
DESCRIPTION
The t_rcvuderr() 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 pro-
duced an error. The argument fd identifies the local transport endpoint through which the error report will
be received. uderr points to a type
t_uderr 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
t_uderr structure has the following members:
struct netbuf addr;
struct netbuf opt;
t_scalar_t error;
The type netbuf structure is defined in the <xti.h> or <tiuser.h> header file. This structure,
which is used to define buffer parameters, has the following members:
unsigned int maxlen maximum byte length of the data buffer
unsigned int len actual byte length of data written to buffer
char *buf 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 identified 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
t_rcvuderr() will simply clear the error indication without reporting any information to the user.
Valid States
T_IDLE
Fork Safety
t_rcvuderr is not fork-safe.
RETURN VALUE
Upon successful completion, a value of 0 is returned. Otherwise, a value of −1 is returned and t_errno is
set to indicate the error.
ERRORS
On failure, t_errno 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 informa-
tion 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.
544 Hewlett-Packard Company − 1 − HP-UX 11i Version 3: February 2007