t_error(3N) (Networking Support Utilities) t_error(3N)
NAME
t_error - produce error message
SYNOPSIS
#include <tiuser.h>
void t_error(errmsg)
char *errmsg;
extern int t_errno;
extern char *t_errlist[];
extern int t_nerr;
DESCRIPTION
t_error 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.
t_error prints the user-supplied error message followed by a colon
and the standard transport function error message for the current
value contained in t_errno. If t_errno is TSYSERR, t_error will also
print the standard error message for the current value contained in
errno [see intro(2)].
t_errlist is the array of message strings, to allow user message
formatting. t_errno can be used as an index into this array to
retrieve the error message string (without a terminating newline).
t_nerr is the maximum index value for the t_errlist array.
t_errno is set when an error occurs and is not cleared on subsequent
successful calls.
EXAMPLE
If a t_connect 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 would print as:
t_connect failed on fd2: Incorrect transport address format
where ``t_connect failed on fd2'' tells the user which function
failed on which transport endpoint, and ``Incorrect transport address
format'' identifies the specific error that occurred.
SEE ALSO
Programmer's Guide: Networking Interfaces.
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