(* ErrnoCategory.def provides an interface to errno.

Copyright (C) 2008-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.

This file is part of GNU Modula-2.

GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  *)

DEFINITION MODULE ErrnoCategory ;

(*
   provides an interface to errno (if the system
   supports it) which determines whether the current
   errno is a hard or soft error.  These distinctions
   are needed by the ISO Modula-2 libraries.  Not all
   errno values are tested, only those which could be
   related to a device.
*)

IMPORT ChanConsts ;


(*
   IsErrnoHard - returns TRUE if the value of errno is associated with
                 a hard device error.
*)

PROCEDURE IsErrnoHard (e: INTEGER) : BOOLEAN ;


(*
   IsErrnoSoft - returns TRUE if the value of errno is associated with
                 a soft device error.
*)

PROCEDURE IsErrnoSoft (e: INTEGER) : BOOLEAN ;


(*
   UnAvailable - returns TRUE if the value of errno indicates that
                 the resource or device is unavailable for some
                 reason.
*)

PROCEDURE UnAvailable (e: INTEGER) : BOOLEAN ;


(*
   GetOpenResults - maps errno onto the ISO Modula-2 enumerated
                    type, OpenResults.
*)

PROCEDURE GetOpenResults (e: INTEGER) : ChanConsts.OpenResults ;


END ErrnoCategory.