Tribblix: manual page: t

T_ERROR(3NSL) Networking Services Library Functions T_ERROR(3NSL)

NAME

t_error - produce error message

SYNOPSIS

#include <xti.h>

int t_error(const char *errmsg);

DESCRIPTION

This routine is part of the XTI interfaces which evolved from the TLI
interfaces. XTI represents the future evolution of these interfaces.
However, TLI interfaces are supported for compatibility. When using a
TLI routine that has the same name as an XTI routine, the tiuser.h
header file must be used. Refer to the TLI COMPATIBILITY section
for a description of differences between the two interfaces.

The t_error() function produces a message on the standard error
output which describes the last error encountered during a call to a
transport function. The argument string errmsg is a user-supplied
error message that gives context to the error.

The error message is written as follows: first (if errmsg is not a
null pointer and the character pointed to be errmsg is not the null
character) the string pointed to by errmsg followed by a colon and a
space; then a standard error message string for the current error
defined in t_errno. If t_errno has a value different from TSYSERR,
the standard error message string is followed by a newline character.
If, however, t_errno is equal to TSYSERR, the t_errno string is
followed by the standard error message string for the current error
defined in errno followed by a newline.

The language for error message strings written by t_error() is that
of the current locale. If it is English, the error message string
describing the value in t_errno may be derived from the comments
following the t_errno codes defined in xti.h. The contents of the
error message strings describing the value in errno are the same as
those returned by the strerror(3C) function with an argument of
errno.

The error number, t_errno, is only set when an error occurs and it is
not cleared on successful calls.

EXAMPLES

If a t_connect(3NSL) function fails on transport endpoint fd2 because
a bad address was given, the following call might follow the failure:

t_error("t_connect failed on fd2");

The diagnostic message to be printed would look like:

t_connect failed on fd2: incorrect addr format

where incorrect addr format identifies the specific error that
occurred, and t_connect failed on fd2 tells the user which function
failed on which transport endpoint.

RETURN VALUES

Upon completion, a value of 0 is returned.

VALID STATES

All - apart from T_UNINIT

ERRORS

No errors are defined for the t_error() function.

TLI COMPATIBILITY

The XTI and TLI interface definitions have common names but use
different header files. This, and other semantic differences between
the two interfaces are described in the subsections below.

Interface Header

The XTI interfaces use the header file, xti.h. TLI interfaces should
not use this header. They should use the header:

#include <tiuser.h>

Error Description Values

The t_errno value that can be set by the XTI interface and cannot be
set by the TLI interface is:

TPROTO

ATTRIBUTES