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-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
--- --
--- I N T E R F A C E S . V X W O R K S . I O --
--- --
--- S p e c --
--- --
--- Copyright (C) 2002-2009, Free Software Foundation, Inc. --
--- --
--- GNARL is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 3, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. --
--- --
--- As a special exception 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/>. --
--- --
--- GNARL was developed by the GNARL team at Florida State University. --
--- Extensive contributions were provided by Ada Core Technologies, Inc. --
--- --
-------------------------------------------------------------------------------
-
--- This package provides a binding to the functions fileno and ioctl
--- in VxWorks, providing a set of definitions of ioctl function codes
--- and options for the use of these functions.
-
--- A particular use of this interface is to enable use of Get_Immediate
--- in Ada.Text_IO. There is no way in VxWorks to provide the desired
--- functionality of Get_Immediate (no buffering and no waiting for a
--- line return) without flushing the buffer, which violates the Ada
--- semantic requirements for Ada.Text_IO.
-
-with Interfaces.C_Streams;
-
-package Interfaces.VxWorks.IO is
-
- -------------------------
- -- The ioctl Interface --
- --------------------------
-
- type FUNCODE is new int;
- -- Type of the function codes in ioctl
-
- type IOOPT is mod 2 ** int'Size;
- -- Type of the option codes in ioctl
-
- -- ioctl function codes (for more information see ioLib.h)
- -- These values could be generated automatically in System.OS_Constants???
-
- FIONREAD : constant FUNCODE := 1;
- FIOFLUSH : constant FUNCODE := 2;
- FIOOPTIONS : constant FUNCODE := 3;
- FIOBAUDRATE : constant FUNCODE := 4;
- FIODISKFORMAT : constant FUNCODE := 5;
- FIODISKINIT : constant FUNCODE := 6;
- FIOSEEK : constant FUNCODE := 7;
- FIOWHERE : constant FUNCODE := 8;
- FIODIRENTRY : constant FUNCODE := 9;
- FIORENAME : constant FUNCODE := 10;
- FIOREADYCHANGE : constant FUNCODE := 11;
- FIONWRITE : constant FUNCODE := 12;
- FIODISKCHANGE : constant FUNCODE := 13;
- FIOCANCEL : constant FUNCODE := 14;
- FIOSQUEEZE : constant FUNCODE := 15;
- FIONBIO : constant FUNCODE := 16;
- FIONMSGS : constant FUNCODE := 17;
- FIOGETNAME : constant FUNCODE := 18;
- FIOGETOPTIONS : constant FUNCODE := 19;
- FIOSETOPTIONS : constant FUNCODE := FIOOPTIONS;
- FIOISATTY : constant FUNCODE := 20;
- FIOSYNC : constant FUNCODE := 21;
- FIOPROTOHOOK : constant FUNCODE := 22;
- FIOPROTOARG : constant FUNCODE := 23;
- FIORBUFSET : constant FUNCODE := 24;
- FIOWBUFSET : constant FUNCODE := 25;
- FIORFLUSH : constant FUNCODE := 26;
- FIOWFLUSH : constant FUNCODE := 27;
- FIOSELECT : constant FUNCODE := 28;
- FIOUNSELECT : constant FUNCODE := 29;
- FIONFREE : constant FUNCODE := 30;
- FIOMKDIR : constant FUNCODE := 31;
- FIORMDIR : constant FUNCODE := 32;
- FIOLABELGET : constant FUNCODE := 33;
- FIOLABELSET : constant FUNCODE := 34;
- FIOATTRIBSE : constant FUNCODE := 35;
- FIOCONTIG : constant FUNCODE := 36;
- FIOREADDIR : constant FUNCODE := 37;
- FIOFSTATGET : constant FUNCODE := 38;
- FIOUNMOUNT : constant FUNCODE := 39;
- FIOSCSICOMMAND : constant FUNCODE := 40;
- FIONCONTIG : constant FUNCODE := 41;
- FIOTRUNC : constant FUNCODE := 42;
- FIOGETFL : constant FUNCODE := 43;
- FIOTIMESET : constant FUNCODE := 44;
- FIOINODETONAM : constant FUNCODE := 45;
- FIOFSTATFSGE : constant FUNCODE := 46;
-
- -- ioctl option values
-
- OPT_ECHO : constant IOOPT := 16#0001#;
- OPT_CRMOD : constant IOOPT := 16#0002#;
- OPT_TANDEM : constant IOOPT := 16#0004#;
- OPT_7_BIT : constant IOOPT := 16#0008#;
- OPT_MON_TRAP : constant IOOPT := 16#0010#;
- OPT_ABORT : constant IOOPT := 16#0020#;
- OPT_LINE : constant IOOPT := 16#0040#;
- OPT_RAW : constant IOOPT := 16#0000#;
- OPT_TERMINAL : constant IOOPT := OPT_ECHO or
- OPT_CRMOD or
- OPT_TANDEM or
- OPT_MON_TRAP or
- OPT_7_BIT or
- OPT_ABORT or
- OPT_LINE;
-
- function fileno (Fp : Interfaces.C_Streams.FILEs) return int;
- pragma Import (C, fileno, "fileno");
- -- Binding to the C routine fileno
-
- function ioctl (Fd : int; Function_Code : FUNCODE; Arg : IOOPT) return int;
- pragma Import (C, ioctl, "ioctl");
- -- Binding to the C routine ioctl
- --
- -- Note: we are taking advantage of the fact that on currently supported
- -- VxWorks targets, it is fine to directly bind to a variadic C function.
-
- ------------------------------
- -- Control of Get_Immediate --
- ------------------------------
-
- -- The procedures in this section make use of the interface to ioctl
- -- and fileno to provide a mechanism for enabling unbuffered behavior
- -- for Get_Immediate in VxWorks.
-
- -- The situation is that the RM requires that the use of Get_Immediate
- -- be identical to Get except that it is desirable (not required) that
- -- there be no buffering or line editing.
-
- -- Unfortunately, in VxWorks, the only way to enable this desired
- -- unbuffered behavior involves changing into raw mode. But this
- -- transition into raw mode flushes the input buffer, a behavior
- -- not permitted by the RM semantics for Get_Immediate.
-
- -- Given that Get_Immediate cannot be accurately implemented in
- -- raw mode, it seems best not to enable it by default, and instead
- -- to require specific programmer action, with the programmer being
- -- aware that input may be lost.
-
- -- The following is an example of the use of the two procedures
- -- in this section (Enable_Get_Immediate and Disable_Get_Immediate)
-
- -- with Ada.Text_IO; use Ada.Text_IO;
- -- with Ada.Text_IO.C_Streams; use Ada.Text_IO.C_Streams;
- -- with Interfaces.VxWorks.IO; use Interfaces.VxWorks.IO;
-
- -- procedure Example_IO is
- -- Input : Character;
- -- Available : Boolean;
- -- Success : Boolean;
-
- -- begin
- -- Enable_Get_Immediate (C_Stream (Current_Input), Success);
-
- -- if Success = False then
- -- raise Device_Error;
- -- end if;
-
- -- -- Example with the first type of Get_Immediate
- -- -- Waits for an entry on the input. Immediately returns
- -- -- after having received an character on the input
-
- -- Put ("Input -> ");
- -- Get_Immediate (Input);
- -- New_Line;
- -- Put_Line ("Character read: " & Input);
-
- -- -- Example with the second type of Get_Immediate
- -- -- This is equivalent to a non blocking read
-
- -- for J in 1 .. 10 loop
- -- Put ("Input -> ");
- -- Get_Immediate (Input, Available);
- -- New_Line;
-
- -- if Available = True then
- -- Put_Line ("Character read: " & Input);
- -- end if;
-
- -- delay 1.0;
- -- end loop;
-
- -- Disable_Get_Immediate (C_Stream (Current_Input), Success);
-
- -- if Success = False then
- -- raise Device_Error;
- -- end if;
-
- -- exception
- -- when Device_Error =>
- -- Put_Line ("Device Error. Check your configuration");
- -- end Example_IO;
-
- procedure Enable_Get_Immediate
- (File : Interfaces.C_Streams.FILEs;
- Success : out Boolean);
- -- On VxWorks, a call to this procedure is required before subsequent calls
- -- to Get_Immediate have the desired effect of not waiting for a line
- -- return. The reason that this call is not automatic on this target is
- -- that the call flushes the input buffer, discarding any previous input.
- -- Note: Following a call to Enable_Get_Immediate, the only permitted
- -- operations on the relevant file are Get_Immediate operations. Any
- -- other operations have undefined behavior.
-
- procedure Disable_Get_Immediate
- (File : Interfaces.C_Streams.FILEs;
- Success : out Boolean);
- -- This procedure resets File to standard mode, and permits subsequent
- -- use of the full range of Ada.Text_IO functions
-
-end Interfaces.VxWorks.IO;