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------------------------------------------------------------------------------
-- --
-- FLORIST (FSU Implementation of POSIX.5) COMPONENTS --
-- --
-- P O S I X . M E M O R Y _ M A P P I N G --
-- --
-- B o d y --
-- --
-- --
-- Copyright (C) 1996-1997 Florida State University --
-- Copyright (C) 1998-2006 AdaCore --
-- --
-- This file is a component of FLORIST, an implementation of an Ada API --
-- for the POSIX OS services, for use with the GNAT Ada compiler and --
-- the FSU Gnu Ada Runtime Library (GNARL). The interface is intended --
-- to be close to that specified in IEEE STD 1003.5: 1990 and IEEE STD --
-- 1003.5b: 1996. --
-- --
-- FLORIST is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the --
-- Free Software Foundation; either version 2, or (at your option) any --
-- later version. FLORIST is distributed in the hope that it will be --
-- useful, but WITHOUT ANY WARRANTY; without even the implied warranty --
-- of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. You should have received a --
-- copy of the GNU General Public License distributed with GNARL; see --
-- file COPYING. If not, write to the Free Software Foundation, 59 --
-- Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
--
--
--
--
--
--
--
------------------------------------------------------------------------------
with POSIX.Implementation,
Unchecked_Conversion;
package body POSIX.Memory_Mapping is
use POSIX.Implementation;
use System;
function To_Address is
new Unchecked_Conversion (ptr_as_int, System.Address);
Zero_Address : constant System.Address := To_Address (0);
Failure : constant System.Address := To_Address (MAP_FAILED);
------------------
-- Map_Memory --
------------------
function mmap
(addr : System.Address;
len : size_t;
prot : int;
flags : int;
fildes : int;
off : off_t) return System.Address;
pragma Import (C, mmap, mmap_LINKNAME);
function Map_Memory
(First : System.Address;
Length : System.Storage_Elements.Storage_Offset;
Protection : Protection_Options;
Mapping : Mapping_Options;
Location : Location_Options;
File : POSIX.IO.File_Descriptor;
Offset : POSIX.IO_Count)
return System.Address is
Result : System.Address;
begin
Result := mmap
(First,
size_t (Length),
int (Option_Set (Protection).Option),
int (Option_Set (Mapping).Option or Option_Set (Location).Option
or MAP_FILE),
int (File),
off_t (Offset));
if Result = Failure then Raise_POSIX_Error; end if;
return Result;
end Map_Memory;
------------------
-- Map_Memory --
------------------
function Map_Memory
(Length : System.Storage_Elements.Storage_Offset;
Protection : Protection_Options;
Mapping : Mapping_Options;
File : POSIX.IO.File_Descriptor;
Offset : POSIX.IO_Count)
return System.Address is
Result : System.Address;
begin
Result := mmap
(Zero_Address,
size_t (Length),
int (Option_Set (Protection).Option),
int (Option_Set (Mapping).Option or MAP_FILE),
int (File),
off_t (Offset));
if Result = Failure then Raise_POSIX_Error; end if;
return Result;
end Map_Memory;
--------------------
-- Unmap_Memory --
--------------------
procedure Unmap_Memory
(First : System.Address;
Length : System.Storage_Elements.Storage_Offset) is
function munmap
(addr : System.Address;
len : size_t) return int;
pragma Import (C, munmap, munmap_LINKNAME);
begin
Check (munmap (First, size_t (Length)));
end Unmap_Memory;
-------------------------
-- Change_Protection --
-------------------------
procedure Change_Protection
(First : System.Address;
Length : System.Storage_Elements.Storage_Offset;
Protection : Protection_Options) is
function mprotect
(addr : System.Address;
len : size_t;
prot : int) return int;
pragma Import (C, mprotect, mprotect_LINKNAME);
begin
Check (mprotect (First, size_t (Length),
int (Option_Set (Protection).Option)));
end Change_Protection;
--------------------------
-- Synchronize_Memory --
--------------------------
procedure Synchronize_Memory
(First : System.Address;
Length : System.Storage_Elements.Storage_Offset;
Options : Synchronize_Memory_Options := Wait_For_Completion) is
function msync
(address : System.Address;
len : size_t;
flags : int) return int;
pragma Import (C, msync, msync_LINKNAME);
begin
Check (msync
(First, size_t (Length), int (Option_Set (Options).Option)));
end Synchronize_Memory;
end POSIX.Memory_Mapping;
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