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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . O S _ I N T E R F A C E --
-- --
-- S p e c --
-- --
-- Copyright (C) 1991-1994, Florida State University --
-- Copyright (C) 1995-2005, 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 2, or (at your option) any later ver- --
-- sion. GNARL 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. 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, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, 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. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
-- This is the OS/2 version of this package
-- This package encapsulates all direct interfaces to OS services
-- that are needed by children of System.
-- PLEASE DO NOT add any with-clauses to this package or remove the pragma
-- Preelaborate. This package is designed to be a bottom-level (leaf) package.
with Interfaces.C;
package System.OS_Interface is
pragma Preelaborate;
package C renames Interfaces.C;
subtype int is C.int;
subtype unsigned_long is C.unsigned_long;
type Duration_In_Millisec is new C.long;
-- New type to prevent confusing time functions in this package
-- with time functions returning seconds or other units.
type Thread_Id is new unsigned_long;
-----------
-- Errno --
-----------
function errno return int;
pragma Import (C, errno, "__get_errno");
EAGAIN : constant := 5;
EINTR : constant := 13;
EINVAL : constant := 14;
ENOMEM : constant := 25;
-------------
-- Signals --
-------------
Max_Interrupt : constant := 15;
type Signal is new int range 0 .. Max_Interrupt;
-- Signals for OS/2, only SIGTERM used currently. The values are
-- fake, since OS/2 uses 32 bit exception numbers that cannot be
-- used to index arrays etc. The GNULLI maps these Unix-like signals
-- to OS/2 exception numbers.
-- SIGTERM is used for the abort interrupt.
SIGHUP : constant := 1; -- hangup
SIGINT : constant := 2; -- interrupt (rubout)
SIGQUIT : constant := 3; -- quit (ASCD FS)
SIGILL : constant := 4; -- illegal instruction (not reset)
SIGTRAP : constant := 5; -- trace trap (not reset)
SIGIOT : constant := 6; -- IOT instruction
SIGEMT : constant := 0; -- EMT instruction
SIGFPE : constant := 8; -- floating point exception
SIGKILL : constant := 9; -- kill (cannot be caught or ignored)
SIGBUS : constant := 10; -- bus error
SIGSEGV : constant := 11; -- segmentation violation
SIGSYS : constant := 12; -- bad argument to system call
SIGPIPE : constant := 13; -- write on a pipe with no one to read it
SIGALRM : constant := 14; -- alarm clock
SIGTERM : constant := 15; -- software termination signal from kill
subtype sigset_t is unsigned_long;
----------
-- Time --
----------
function Clock return Duration;
pragma Inline (Clock);
-- Clock measuring time since the epoch, which is the boot-time.
-- The clock resolution is approximately 838 ns.
procedure Delay_For (Period : in Duration_In_Millisec);
pragma Inline (Delay_For);
-- Changed Sleep to Delay_For, for consistency with System.Time_Operations
----------------
-- Scheduling --
----------------
-- Put the calling task at the end of the ready queue for its priority
procedure Yield;
pragma Inline (Yield);
end System.OS_Interface;
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