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(* RTio.mod implements low level routines for creating and destroying ChanIds.
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/>. *)
IMPLEMENTATION MODULE RTio ;
FROM Storage IMPORT ALLOCATE, DEALLOCATE ;
TYPE
ChanId = POINTER TO RECORD
did : IOLink.DeviceId ;
dtp : IOLink.DeviceTablePtr ;
file : FIO.File ;
END ;
(*
InitChanId - return a new ChanId.
*)
PROCEDURE InitChanId () : ChanId ;
VAR
c: ChanId ;
BEGIN
NEW(c) ;
RETURN( c )
END InitChanId ;
(*
InitChanId - deallocate a ChanId.
*)
PROCEDURE KillChanId (c: ChanId) : ChanId ;
BEGIN
DISPOSE(c) ;
RETURN( NIL )
END KillChanId ;
(*
NilChanId - return a NIL pointer.
*)
PROCEDURE NilChanId () : ChanId ;
BEGIN
RETURN( NIL )
END NilChanId ;
(*
GetDeviceId - returns the device id, from, c.
*)
PROCEDURE GetDeviceId (c: ChanId) : IOLink.DeviceId ;
BEGIN
RETURN( c^.did )
END GetDeviceId ;
(*
SetDeviceId - returns the device id, from, c.
*)
PROCEDURE SetDeviceId (c: ChanId; d: IOLink.DeviceId) ;
BEGIN
c^.did := d
END SetDeviceId ;
(*
GetDevicePtr - returns the device table ptr, from, c.
*)
PROCEDURE GetDevicePtr (c: ChanId) : IOLink.DeviceTablePtr ;
BEGIN
RETURN( c^.dtp )
END GetDevicePtr ;
(*
SetDevicePtr - sets the device table ptr in, c.
*)
PROCEDURE SetDevicePtr (c: ChanId; p: IOLink.DeviceTablePtr) ;
BEGIN
c^.dtp := p
END SetDevicePtr ;
(*
GetFile - returns the file field from, c.
*)
PROCEDURE GetFile (c: ChanId) : FIO.File ;
BEGIN
RETURN( c^.file )
END GetFile ;
(*
SetFile - sets the file field in, c.
*)
PROCEDURE SetFile (c: ChanId; f: FIO.File) ;
BEGIN
c^.file := f
END SetFile ;
END RTio.
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