gcc/ada/libgnat/g-tty.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT LIBRARY COMPONENTS                          --
   4 --                                                                          --
   5 --                             G N A T . T T Y                              --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                     Copyright (C) 2002-2017, AdaCore                     --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 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 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This package provides control over pseudo terminals (ttys)
  33
  34 --  This package is only supported on unix systems. See function TTY_Supported
  35 --  to test dynamically whether other functions of this package can be called.
  36
  37 with System;
  38
  39 with GNAT.OS_Lib;
  40
  41 package GNAT.TTY is
  42
  43    type TTY_Handle is private;
  44    --  Handle for a tty descriptor
  45
  46    function TTY_Supported return Boolean;
  47    --  If True, the other functions of this package can be called. Otherwise,
  48    --  all functions in this package will raise Program_Error if called.
  49
  50    procedure Allocate_TTY (Handle : out TTY_Handle);
  51    --  Allocate a new tty
  52
  53    procedure Reset_TTY (Handle : TTY_Handle);
  54    --  Reset settings of a given tty
  55
  56    procedure Close_TTY (Handle : in out TTY_Handle);
  57    --  Close a given tty
  58
  59    function TTY_Name (Handle : TTY_Handle) return String;
  60    --  Return the external name of a tty. The name depends on the tty handling
  61    --  on the given target. It will typically look like: "/dev/ptya1"
  62
  63    function TTY_Descriptor
  64      (Handle : TTY_Handle) return GNAT.OS_Lib.File_Descriptor;
  65    --  Return the low level descriptor associated with Handle
  66
  67 private
  68
  69    type TTY_Handle is record
  70       Handle : System.Address := System.Null_Address;
  71    end record;
  72
  73 end GNAT.TTY;