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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- S Y S T E M . I N T E R R U P T _ M A N A G E M E N T . --
-- O P E R A T I O N S --
-- --
-- B o d y --
-- --
-- Copyright (C) 1991-1994, Florida State University --
-- Copyright (C) 1995-2006, AdaCore --
-- --
-- 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 a POSIX-like version of this package.
-- Note: this file can only be used for POSIX compliant systems.
with Interfaces.C;
-- used for int
-- size_t
-- unsigned
with System.OS_Interface;
-- used for various type, constant, and operations
with System.Storage_Elements;
-- used for To_Address
-- Integer_Address
package body System.Interrupt_Management.Operations is
use Interfaces.C;
use System.OS_Interface;
---------------------
-- Local Variables --
---------------------
Initial_Action : array (Signal) of aliased struct_sigaction;
Default_Action : aliased struct_sigaction;
Ignore_Action : aliased struct_sigaction;
----------------------------
-- Thread_Block_Interrupt --
----------------------------
procedure Thread_Block_Interrupt
(Interrupt : Interrupt_ID)
is
Result : Interfaces.C.int;
Mask : aliased sigset_t;
begin
Result := sigemptyset (Mask'Access);
pragma Assert (Result = 0);
Result := sigaddset (Mask'Access, Signal (Interrupt));
pragma Assert (Result = 0);
Result := pthread_sigmask (SIG_BLOCK, Mask'Unchecked_Access, null);
pragma Assert (Result = 0);
end Thread_Block_Interrupt;
------------------------------
-- Thread_Unblock_Interrupt --
------------------------------
procedure Thread_Unblock_Interrupt
(Interrupt : Interrupt_ID)
is
Mask : aliased sigset_t;
Result : Interfaces.C.int;
begin
Result := sigemptyset (Mask'Access);
pragma Assert (Result = 0);
Result := sigaddset (Mask'Access, Signal (Interrupt));
pragma Assert (Result = 0);
Result := pthread_sigmask (SIG_UNBLOCK, Mask'Unchecked_Access, null);
pragma Assert (Result = 0);
end Thread_Unblock_Interrupt;
------------------------
-- Set_Interrupt_Mask --
------------------------
procedure Set_Interrupt_Mask (Mask : access Interrupt_Mask) is
Result : Interfaces.C.int;
begin
Result := pthread_sigmask (SIG_SETMASK, Mask, null);
pragma Assert (Result = 0);
end Set_Interrupt_Mask;
procedure Set_Interrupt_Mask
(Mask : access Interrupt_Mask;
OMask : access Interrupt_Mask)
is
Result : Interfaces.C.int;
begin
Result := pthread_sigmask (SIG_SETMASK, Mask, OMask);
pragma Assert (Result = 0);
end Set_Interrupt_Mask;
------------------------
-- Get_Interrupt_Mask --
------------------------
procedure Get_Interrupt_Mask (Mask : access Interrupt_Mask) is
Result : Interfaces.C.int;
begin
Result := pthread_sigmask (SIG_SETMASK, null, Mask);
pragma Assert (Result = 0);
end Get_Interrupt_Mask;
--------------------
-- Interrupt_Wait --
--------------------
function Interrupt_Wait
(Mask : access Interrupt_Mask)
return Interrupt_ID
is
Result : Interfaces.C.int;
Sig : aliased Signal;
begin
Result := sigwait (Mask, Sig'Access);
if Result /= 0 then
return 0;
end if;
return Interrupt_ID (Sig);
end Interrupt_Wait;
----------------------------
-- Install_Default_Action --
----------------------------
procedure Install_Default_Action (Interrupt : Interrupt_ID) is
Result : Interfaces.C.int;
begin
Result := sigaction
(Signal (Interrupt),
Initial_Action (Signal (Interrupt))'Access, null);
pragma Assert (Result = 0);
end Install_Default_Action;
---------------------------
-- Install_Ignore_Action --
---------------------------
procedure Install_Ignore_Action (Interrupt : Interrupt_ID) is
Result : Interfaces.C.int;
begin
Result := sigaction (Signal (Interrupt), Ignore_Action'Access, null);
pragma Assert (Result = 0);
end Install_Ignore_Action;
-------------------------
-- Fill_Interrupt_Mask --
-------------------------
procedure Fill_Interrupt_Mask (Mask : access Interrupt_Mask) is
Result : Interfaces.C.int;
begin
Result := sigfillset (Mask);
pragma Assert (Result = 0);
end Fill_Interrupt_Mask;
--------------------------
-- Empty_Interrupt_Mask --
--------------------------
procedure Empty_Interrupt_Mask (Mask : access Interrupt_Mask) is
Result : Interfaces.C.int;
begin
Result := sigemptyset (Mask);
pragma Assert (Result = 0);
end Empty_Interrupt_Mask;
---------------------------
-- Add_To_Interrupt_Mask --
---------------------------
procedure Add_To_Interrupt_Mask
(Mask : access Interrupt_Mask;
Interrupt : Interrupt_ID)
is
Result : Interfaces.C.int;
begin
Result := sigaddset (Mask, Signal (Interrupt));
pragma Assert (Result = 0);
end Add_To_Interrupt_Mask;
--------------------------------
-- Delete_From_Interrupt_Mask --
--------------------------------
procedure Delete_From_Interrupt_Mask
(Mask : access Interrupt_Mask;
Interrupt : Interrupt_ID)
is
Result : Interfaces.C.int;
begin
Result := sigdelset (Mask, Signal (Interrupt));
pragma Assert (Result = 0);
end Delete_From_Interrupt_Mask;
---------------
-- Is_Member --
---------------
function Is_Member
(Mask : access Interrupt_Mask;
Interrupt : Interrupt_ID) return Boolean
is
Result : Interfaces.C.int;
begin
Result := sigismember (Mask, Signal (Interrupt));
pragma Assert (Result = 0 or else Result = 1);
return Result = 1;
end Is_Member;
-------------------------
-- Copy_Interrupt_Mask --
-------------------------
procedure Copy_Interrupt_Mask
(X : out Interrupt_Mask;
Y : Interrupt_Mask) is
begin
X := Y;
end Copy_Interrupt_Mask;
----------------------------
-- Interrupt_Self_Process --
----------------------------
procedure Interrupt_Self_Process (Interrupt : Interrupt_ID) is
Result : Interfaces.C.int;
begin
Result := kill (getpid, Signal (Interrupt));
pragma Assert (Result = 0);
end Interrupt_Self_Process;
--------------------------
-- Setup_Interrupt_Mask --
--------------------------
procedure Setup_Interrupt_Mask is
begin
-- Mask task for all signals. The original mask of the Environment task
-- will be recovered by Interrupt_Manager task during the elaboration
-- of s-interr.adb.
Set_Interrupt_Mask (All_Tasks_Mask'Access);
end Setup_Interrupt_Mask;
begin
declare
mask : aliased sigset_t;
allmask : aliased sigset_t;
Result : Interfaces.C.int;
begin
Interrupt_Management.Initialize;
for Sig in 1 .. Signal'Last loop
Result := sigaction
(Sig, null, Initial_Action (Sig)'Unchecked_Access);
-- ??? [assert 1]
-- we can't check Result here since sigaction will fail on
-- SIGKILL, SIGSTOP, and possibly other signals
-- pragma Assert (Result = 0);
end loop;
-- Setup the masks to be exported.
Result := sigemptyset (mask'Access);
pragma Assert (Result = 0);
Result := sigfillset (allmask'Access);
pragma Assert (Result = 0);
Default_Action.sa_flags := 0;
Default_Action.sa_mask := mask;
Default_Action.sa_handler :=
Storage_Elements.To_Address
(Storage_Elements.Integer_Address (SIG_DFL));
Ignore_Action.sa_flags := 0;
Ignore_Action.sa_mask := mask;
Ignore_Action.sa_handler :=
Storage_Elements.To_Address
(Storage_Elements.Integer_Address (SIG_IGN));
for J in Interrupt_ID loop
-- We need to check whether J is in Keep_Unmasked because
-- the index type of the Keep_Unmasked array is not always
-- Interrupt_ID; it may be a subtype of Interrupt_ID.
if J in Keep_Unmasked'Range and then Keep_Unmasked (J) then
Result := sigaddset (mask'Access, Signal (J));
pragma Assert (Result = 0);
Result := sigdelset (allmask'Access, Signal (J));
pragma Assert (Result = 0);
end if;
end loop;
-- The Keep_Unmasked signals should be unmasked for Environment task
Result := pthread_sigmask (SIG_UNBLOCK, mask'Unchecked_Access, null);
pragma Assert (Result = 0);
-- Get the signal mask of the Environment Task
Result := pthread_sigmask (SIG_SETMASK, null, mask'Unchecked_Access);
pragma Assert (Result = 0);
-- Setup the constants exported
Environment_Mask := Interrupt_Mask (mask);
All_Tasks_Mask := Interrupt_Mask (allmask);
end;
end System.Interrupt_Management.Operations;
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