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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT LIBRARY COMPONENTS --
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4 -- --
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5 -- G N A T . T T Y --
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6 -- --
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7 -- S p e c --
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8 -- --
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145
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9 -- Copyright (C) 2002-2019, AdaCore --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- This package provides control over pseudo terminals (ttys)
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33
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34 -- This package is only supported on unix systems. See function TTY_Supported
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35 -- to test dynamically whether other functions of this package can be called.
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36
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37 with System;
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38
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39 with GNAT.OS_Lib;
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40
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41 package GNAT.TTY is
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42
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43 type TTY_Handle is private;
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44 -- Handle for a tty descriptor
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45
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46 function TTY_Supported return Boolean;
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47 -- If True, the other functions of this package can be called. Otherwise,
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48 -- all functions in this package will raise Program_Error if called.
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49
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50 procedure Allocate_TTY (Handle : out TTY_Handle);
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51 -- Allocate a new tty
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52
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53 procedure Reset_TTY (Handle : TTY_Handle);
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54 -- Reset settings of a given tty
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55
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56 procedure Close_TTY (Handle : in out TTY_Handle);
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57 -- Close a given tty
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58
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59 function TTY_Name (Handle : TTY_Handle) return String;
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60 -- Return the external name of a tty. The name depends on the tty handling
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61 -- on the given target. It will typically look like: "/dev/ptya1"
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62
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63 function TTY_Descriptor
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64 (Handle : TTY_Handle) return GNAT.OS_Lib.File_Descriptor;
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65 -- Return the low level descriptor associated with Handle
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66
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67 private
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68
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69 type TTY_Handle is record
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70 Handle : System.Address := System.Null_Address;
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71 end record;
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72
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73 end GNAT.TTY;
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