gcc/m2/gm2-libs/Selective.def

   1 (* Selective.def provides Modula-2 with access to the select(2) primitive.
   2
   3 Copyright (C) 2001-2024 Free Software Foundation, Inc.
   4 Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
   5
   6 This file is part of GNU Modula-2.
   7
   8 GNU Modula-2 is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GNU Modula-2 is distributed in the hope that it will be useful, but
  14 WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 General Public License for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 <http://www.gnu.org/licenses/>.  *)
  26
  27 DEFINITION MODULE Selective ;
  28
  29 FROM SYSTEM IMPORT ADDRESS ;
  30
  31 EXPORT QUALIFIED SetOfFd, Timeval,
  32                  InitSet, KillSet, InitTime, KillTime,
  33                  GetTime, SetTime,
  34                  FdZero, FdSet, FdClr, FdIsSet, Select,
  35                  MaxFdsPlusOne, WriteCharRaw, ReadCharRaw,
  36                  GetTimeOfDay ;
  37
  38 TYPE
  39    SetOfFd = ADDRESS ;    (* Hidden type in Selective.c *)
  40    Timeval = ADDRESS ;    (* Hidden type in Selective.c *)
  41
  42
  43 PROCEDURE Select (nooffds: CARDINAL;
  44                   readfds, writefds, exceptfds: SetOfFd;
  45                   timeout: Timeval) : INTEGER ;
  46
  47 PROCEDURE InitTime (sec, usec: CARDINAL) : Timeval ;
  48 PROCEDURE KillTime (t: Timeval) : Timeval ;
  49 PROCEDURE GetTime (t: Timeval; VAR sec, usec: CARDINAL) ;
  50 PROCEDURE SetTime (t: Timeval; sec, usec: CARDINAL) ;
  51 PROCEDURE InitSet () : SetOfFd ;
  52 PROCEDURE KillSet (s: SetOfFd) : SetOfFd ;
  53 PROCEDURE FdZero (s: SetOfFd) ;
  54 PROCEDURE FdSet (fd: INTEGER; s: SetOfFd) ;
  55 PROCEDURE FdClr (fd: INTEGER; s: SetOfFd) ;
  56 PROCEDURE FdIsSet (fd: INTEGER; s: SetOfFd) : BOOLEAN ;
  57 PROCEDURE MaxFdsPlusOne (a, b: INTEGER) : INTEGER ;
  58
  59 (* you must use the raw routines with select - not the FIO buffered routines *)
  60 PROCEDURE WriteCharRaw (fd: INTEGER; ch: CHAR) ;
  61 PROCEDURE ReadCharRaw (fd: INTEGER) : CHAR ;
  62
  63 (*
  64    GetTimeOfDay - fills in a record, Timeval, filled in with the
  65                   current system time in seconds and microseconds.
  66                   It returns zero (see man 3p gettimeofday)
  67 *)
  68
  69 PROCEDURE GetTimeOfDay (tv: Timeval) : INTEGER ;
  70
  71
  72 END Selective.