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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- S Y S T E M . C O M M U N I C A T I O N --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 2001-2012, AdaCore --
+-- --
+-- 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. --
+-- --
+------------------------------------------------------------------------------
+
+-- Common support unit for GNAT.Sockets and GNAT.Serial_Communication
+
+with Ada.Streams;
+with System.CRTL;
+
+package System.Communication is
+ pragma Preelaborate;
+
+ function Last_Index
+ (First : Ada.Streams.Stream_Element_Offset;
+ Count : CRTL.size_t) return Ada.Streams.Stream_Element_Offset;
+ -- Compute the Last OUT parameter for the various Read / Receive
+ -- subprograms: returns First + Count - 1.
+ --
+ -- When First = Stream_Element_Offset'First and Res = 0, Constraint_Error
+ -- is raised. This is consistent with the semantics of stream operations
+ -- as clarified in AI95-227.
+
+end System.Communication;