| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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) 1992-2021, 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; |
