File : posix-permissions.adb
------------------------------------------------------------------------------
-- --
-- FLORIST (FSU Implementation of POSIX.5) COMPONENTS --
-- --
-- P O S I X . P E R M I S S I O N S --
-- --
-- B o d y --
-- --
-- --
-- Copyright (c) 1996, 1997 Florida State University (FSU), --
-- All Rights Reserved. --
-- --
-- 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. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
------------------------------------------------------------------------------
-- [$Revision: 1.1.1.1 $]
with POSIX.C,
POSIX.Implementation,
POSIX.Permissions.Implementation;
package body POSIX.Permissions is
use POSIX.C;
use POSIX.Implementation;
use POSIX.Permissions.Implementation;
------------------------
-- local declarations --
------------------------
Cached_Umask : mode_t := 0;
-----------------------
-- local subprograms --
-----------------------
function umask (c_mask : mode_t) return mode_t;
pragma Import (C, umask, umask_LINKNAME);
---------------------------------------
-- Get_Allowed_Process_Permissions --
---------------------------------------
function Get_Allowed_Process_Permissions return Permission_Set is
Mask : mode_t;
begin
Begin_Critical_Section;
Mask := umask (Cached_Umask);
if Mask /= Cached_Umask then
Cached_Umask := Mask;
Mask := umask (Mask);
end if;
End_Critical_Section;
return Form_Ada_Permission
((not Cached_Umask) and File_Access_Permission_Bits);
-- The allowed process permissions are the complement of the
-- file permission bits in umask.
-- The Ada interface requires that the other bits be zero.
-- We cache the old umask, to reduce the number of calls.
end Get_Allowed_Process_Permissions;
---------------------------------------
-- Set_Allowed_Process_Permissions --
---------------------------------------
procedure Set_Allowed_Process_Permissions
(Permissions : in Permission_Set) is
Mask : mode_t :=
not (Form_C_Permission (Permissions) and File_Access_Permission_Bits);
begin
Cached_Umask := Mask;
Mask := umask (Mask);
end Set_Allowed_Process_Permissions;
---------------------------------------
-- Set_Allowed_Process_Permissions --
---------------------------------------
procedure Set_Allowed_Process_Permissions
(Permissions : in Permission_Set;
Old_Perms : out Permission_Set) is
Mask : mode_t :=
not (Form_C_Permission (Permissions) and File_Access_Permission_Bits);
begin
Cached_Umask := Mask;
Old_Perms := Form_Ada_Permission ((not umask (Mask)) and
File_Access_Permission_Bits);
end Set_Allowed_Process_Permissions;
end POSIX.Permissions;