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------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- S Y S T E M . D I R E C T _ I O -- -- -- -- S p e c -- -- -- -- Copyright (C) 1992-2009, Free Software Foundation, Inc. -- -- -- -- GNAT 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/>. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- This package contains the declaration of the control block used for -- Direct_IO. This must be declared at the outer library level. It also -- contains code that is shared between instances of Direct_IO. with Interfaces.C_Streams; with Ada.Streams; with System.File_Control_Block; with System.Storage_Elements; package System.Direct_IO is package FCB renames System.File_Control_Block; type Operation is (Op_Read, Op_Write, Op_Other); -- Type used to record last operation (to optimize sequential operations) subtype Count is Interfaces.C_Streams.long; -- The Count type in each instantiation is derived from this type subtype Positive_Count is Count range 1 .. Count'Last; type Direct_AFCB is new FCB.AFCB with record Index : Count := 1; -- Current Index value Bytes : Interfaces.C_Streams.size_t; -- Length of item in bytes (set from inside generic template) Last_Op : Operation := Op_Other; -- Last operation performed on file, used to avoid unnecessary -- repositioning between successive read or write operations. end record; function AFCB_Allocate (Control_Block : Direct_AFCB) return FCB.AFCB_Ptr; procedure AFCB_Close (File : not null access Direct_AFCB); procedure AFCB_Free (File : not null access Direct_AFCB); procedure Read (File : in out Direct_AFCB; Item : out Ada.Streams.Stream_Element_Array; Last : out Ada.Streams.Stream_Element_Offset); -- Required overriding of Read, not actually used for Direct_IO procedure Write (File : in out Direct_AFCB; Item : Ada.Streams.Stream_Element_Array); -- Required overriding of Write, not actually used for Direct_IO type File_Type is access all Direct_AFCB; -- File_Type in individual instantiations is derived from this type procedure Create (File : in out File_Type; Mode : FCB.File_Mode := FCB.Inout_File; Name : String := ""; Form : String := ""); function End_Of_File (File : File_Type) return Boolean; function Index (File : File_Type) return Positive_Count; procedure Open (File : in out File_Type; Mode : FCB.File_Mode; Name : String; Form : String := ""); procedure Read (File : File_Type; Item : System.Address; Size : Interfaces.C_Streams.size_t; From : Positive_Count); procedure Read (File : File_Type; Item : System.Address; Size : Interfaces.C_Streams.size_t); procedure Reset (File : in out File_Type; Mode : FCB.File_Mode); procedure Reset (File : in out File_Type); procedure Set_Index (File : File_Type; To : Positive_Count); function Size (File : File_Type) return Count; procedure Write (File : File_Type; Item : System.Address; Size : Interfaces.C_Streams.size_t; Zeroes : System.Storage_Elements.Storage_Array); -- Note: Zeroes is the buffer of zeroes used to fill out partial records -- The following procedures have a File_Type formal of mode IN OUT because -- they may close the original file. The Close operation may raise an -- exception, but in that case we want any assignment to the formal to -- be effective anyway, so it must be passed by reference (or the caller -- will be left with a dangling pointer). pragma Export_Procedure (Internal => Reset, External => "", Parameter_Types => (File_Type), Mechanism => Reference); pragma Export_Procedure (Internal => Reset, External => "", Parameter_Types => (File_Type, FCB.File_Mode), Mechanism => (File => Reference)); end System.Direct_IO;