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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 -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2009, 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 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/>. -- -- -- -- GNARL was developed by the GNARL team at Florida State University. -- -- Extensive contributions were provided by Ada Core Technologies, Inc. -- -- -- ------------------------------------------------------------------------------ -- This is a Solaris version of this package -- Make a careful study of all signals available under the OS, to see which -- need to be reserved, kept always unmasked, or kept always unmasked. -- Be on the lookout for special signals that may be used by the thread -- library. package body System.Interrupt_Management is use Interfaces.C; use System.OS_Interface; type Interrupt_List is array (Interrupt_ID range <>) of Interrupt_ID; Exception_Interrupts : constant Interrupt_List := (SIGFPE, SIGILL, SIGSEGV, SIGBUS); Unreserve_All_Interrupts : Interfaces.C.int; pragma Import (C, Unreserve_All_Interrupts, "__gl_unreserve_all_interrupts"); function State (Int : Interrupt_ID) return Character; pragma Import (C, State, "__gnat_get_interrupt_state"); -- Get interrupt state. Defined in init.c -- The input argument is the interrupt number, -- and the result is one of the following: User : constant Character := 'u'; Runtime : constant Character := 'r'; Default : constant Character := 's'; -- 'n' this interrupt not set by any Interrupt_State pragma -- 'u' Interrupt_State pragma set state to User -- 'r' Interrupt_State pragma set state to Runtime -- 's' Interrupt_State pragma set state to System (use "default" -- system handler) ---------------------- -- Notify_Exception -- ---------------------- -- This function identifies the Ada exception to be raised using the -- information when the system received a synchronous signal. Since this -- function is machine and OS dependent, different code has to be provided -- for different target. procedure Notify_Exception (signo : Signal; info : access siginfo_t; context : access ucontext_t); ---------------------- -- Notify_Exception -- ---------------------- procedure Notify_Exception (signo : Signal; info : access siginfo_t; context : access ucontext_t) is pragma Unreferenced (info); begin -- Perform the necessary context adjustments prior to a raise -- from a signal handler. Adjust_Context_For_Raise (signo, context.all'Address); -- Check that treatment of exception propagation here is consistent with -- treatment of the abort signal in System.Task_Primitives.Operations. case signo is when SIGFPE => raise Constraint_Error; when SIGILL => raise Program_Error; when SIGSEGV => raise Storage_Error; when SIGBUS => raise Storage_Error; when others => null; end case; end Notify_Exception; ---------------- -- Initialize -- ---------------- Initialized : Boolean := False; procedure Initialize is act : aliased struct_sigaction; old_act : aliased struct_sigaction; mask : aliased sigset_t; Result : Interfaces.C.int; begin if Initialized then return; end if; Initialized := True; -- Need to call pthread_init very early because it is doing signal -- initializations. pthread_init; -- Change this if you want to use another signal for task abort. -- SIGTERM might be a good one. Abort_Task_Interrupt := SIGABRT; act.sa_handler := Notify_Exception'Address; -- Set sa_flags to SA_NODEFER so that during the handler execution -- we do not change the Signal_Mask to be masked for the Signal. -- This is a temporary fix to the problem that the Signal_Mask is -- not restored after the exception (longjmp) from the handler. -- The right fix should be made in sigsetjmp so that we save -- the Signal_Set and restore it after a longjmp. -- In that case, this field should be changed back to 0. ??? (Dong-Ik) act.sa_flags := 16; Result := sigemptyset (mask'Access); pragma Assert (Result = 0); -- ??? For the same reason explained above, we can't mask these signals -- because otherwise we won't be able to catch more than one signal. act.sa_mask := mask; pragma Assert (Keep_Unmasked = (Interrupt_ID'Range => False)); pragma Assert (Reserve = (Interrupt_ID'Range => False)); for J in Exception_Interrupts'Range loop if State (Exception_Interrupts (J)) /= User then Keep_Unmasked (Exception_Interrupts (J)) := True; Reserve (Exception_Interrupts (J)) := True; if State (Exception_Interrupts (J)) /= Default then Result := sigaction (Signal (Exception_Interrupts (J)), act'Unchecked_Access, old_act'Unchecked_Access); pragma Assert (Result = 0); end if; end if; end loop; if State (Abort_Task_Interrupt) /= User then Keep_Unmasked (Abort_Task_Interrupt) := True; Reserve (Abort_Task_Interrupt) := True; end if; -- Set SIGINT to unmasked state as long as it's -- not in "User" state. Check for Unreserve_All_Interrupts last if State (SIGINT) /= User then Keep_Unmasked (SIGINT) := True; Reserve (SIGINT) := True; end if; -- Check all signals for state that requires keeping them -- unmasked and reserved for J in Interrupt_ID'Range loop if State (J) = Default or else State (J) = Runtime then Keep_Unmasked (J) := True; Reserve (J) := True; end if; end loop; -- Add the set of signals that must always be unmasked for this target for J in Unmasked'Range loop Keep_Unmasked (Interrupt_ID (Unmasked (J))) := True; Reserve (Interrupt_ID (Unmasked (J))) := True; end loop; -- Add target-specific reserved signals for J in Reserved'Range loop Reserve (Interrupt_ID (Reserved (J))) := True; end loop; -- Process pragma Unreserve_All_Interrupts. This overrides any -- settings due to pragma Interrupt_State: if Unreserve_All_Interrupts /= 0 then Keep_Unmasked (SIGINT) := False; Reserve (SIGINT) := False; end if; -- We do not have Signal 0 in reality. We just use this value to -- identify not existing signals (see s-intnam.ads). Therefore, Signal 0 -- should not be used in all signal related operations hence mark it as -- reserved. Reserve (0) := True; end Initialize; end System.Interrupt_Management;
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