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

NAME

       t_errno - XTI error return value

SYNOPSIS

       #include <xti.h>

DESCRIPTION

       This  error  return  value is part of the XTI interfaces that evolved from the TLI interfaces. XTI represents the future evolution of these
       interfaces. However, TLI interfaces are supported for compatibility.  When using a TLI interface that has the same name as  an  XTI  inter-
       faces,  a  different headerfile, <tiuser.h>, must be used. Refer the the TLI COMPATIBILITY section for a description of differences between
       the two interfaces.

       t_errno is used by XTI functions to return error values.

       XTI functions provide an error number in  t_errno which has type  int and is defined in	<xti.h>. The value of	t_errno  will  be  defined
       only  after a call to a XTI function for which it is explicitly stated to be set and until it is changed by the next XTI function call. The
       value of  t_errno should only be examined when it is indicated to be valid by a function's return value. Programs should obtain the defini-
       tion  of  t_errno by the inclusion of  <xti.h>.	The practice of defining  t_errno in program as  extern int t_errno is obsolescent. No XTI
       function sets  t_errno to 0 to indicate an error.

       It is unspecified whether t_errno is a macro or an identifier with external linkage.  It represents a modifiable  lvalue of type int.  If a
       macro  definition  is suppressed in order to access an actual object or a program defines an identifier with name  t_errno, the behavior is
       undefined.

       The symbolic values stored in  t_errno by an XTI function are defined in the ERRORS sections in all relevant XTI function definition pages.

TLI COMPATIBILITY

       t_errno is also used by TLI functions to return error values.

       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 values that can be set by the XTI interface but cannot be set by the TLI interface are:

		 TNOSTRUCTYPE

		 TBADNAME

		 TBADQLEN

		 TADDRBUSY

		 TINDOUT

		 TPROVMISMATCH

		 TRESADDR

		 TQFULL

		 TPROTO

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

SunOS 5.10							    7 May 1998							     t_errno(3NSL)