1 ------------------------------------------------------------------------------
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
5 -- 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 --
9 -- Copyright (C) 1992-2005 Free Software Foundation, Inc. --
11 -- GNARL is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNARL; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNARL was developed by the GNARL team at Florida State University. --
30 -- Extensive contributions were provided by Ada Core Technologies, Inc. --
32 ------------------------------------------------------------------------------
34 -- This is a Solaris version of this package.
36 -- Make a careful study of all signals available under the OS,
37 -- to see which need to be reserved, kept always unmasked,
38 -- or kept always unmasked.
40 -- Be on the lookout for special signals that
41 -- may be used by the thread library.
46 with System
.OS_Interface
;
47 -- used for various Constants, Signal and types
49 package body System
.Interrupt_Management
is
52 use System
.OS_Interface
;
54 type Interrupt_List
is array (Interrupt_ID
range <>) of Interrupt_ID
;
56 Exception_Interrupts
: constant Interrupt_List
:=
57 (SIGFPE
, SIGILL
, SIGSEGV
, SIGBUS
);
59 Unreserve_All_Interrupts
: Interfaces
.C
.int
;
61 (C
, Unreserve_All_Interrupts
, "__gl_unreserve_all_interrupts");
63 function State
(Int
: Interrupt_ID
) return Character;
64 pragma Import
(C
, State
, "__gnat_get_interrupt_state");
65 -- Get interrupt state. Defined in init.c
66 -- The input argument is the interrupt number,
67 -- and the result is one of the following:
69 User
: constant Character := 'u';
70 Runtime
: constant Character := 'r';
71 Default
: constant Character := 's';
72 -- 'n' this interrupt not set by any Interrupt_State pragma
73 -- 'u' Interrupt_State pragma set state to User
74 -- 'r' Interrupt_State pragma set state to Runtime
75 -- 's' Interrupt_State pragma set state to System (use "default"
78 ----------------------
79 -- Notify_Exception --
80 ----------------------
82 -- This function identifies the Ada exception to be raised using
83 -- the information when the system received a synchronous signal.
84 -- Since this function is machine and OS dependent, different code
85 -- has to be provided for different target.
87 procedure Notify_Exception
89 info
: access siginfo_t
;
90 context
: access ucontext_t
);
92 ----------------------
93 -- Notify_Exception --
94 ----------------------
96 procedure Notify_Exception
98 info
: access siginfo_t
;
99 context
: access ucontext_t
)
101 pragma Unreferenced
(context
);
103 -- Check that treatment of exception propagation here
104 -- is consistent with treatment of the abort signal in
105 -- System.Task_Primitives.Operations.
119 raise Constraint_Error
;
122 pragma Assert
(False);
126 when SIGILL | SIGSEGV | SIGBUS
=>
130 pragma Assert
(False);
133 end Notify_Exception
;
139 Initialized
: Boolean := False;
141 procedure Initialize
is
142 act
: aliased struct_sigaction
;
143 old_act
: aliased struct_sigaction
;
144 mask
: aliased sigset_t
;
145 Result
: Interfaces
.C
.int
;
154 -- Need to call pthread_init very early because it is doing signal
159 -- Change this if you want to use another signal for task abort.
160 -- SIGTERM might be a good one.
162 Abort_Task_Interrupt
:= SIGABRT
;
164 act
.sa_handler
:= Notify_Exception
'Address;
166 -- Set sa_flags to SA_NODEFER so that during the handler execution
167 -- we do not change the Signal_Mask to be masked for the Signal.
168 -- This is a temporary fix to the problem that the Signal_Mask is
169 -- not restored after the exception (longjmp) from the handler.
170 -- The right fix should be made in sigsetjmp so that we save
171 -- the Signal_Set and restore it after a longjmp.
173 -- In that case, this field should be changed back to 0. ??? (Dong-Ik)
177 Result
:= sigemptyset
(mask
'Access);
178 pragma Assert
(Result
= 0);
180 -- ??? For the same reason explained above, we can't mask these
181 -- signals because otherwise we won't be able to catch more than
186 pragma Assert
(Keep_Unmasked
= (Interrupt_ID
'Range => False));
187 pragma Assert
(Reserve
= (Interrupt_ID
'Range => False));
189 for J
in Exception_Interrupts
'Range loop
190 if State
(Exception_Interrupts
(J
)) /= User
then
191 Keep_Unmasked
(Exception_Interrupts
(J
)) := True;
192 Reserve
(Exception_Interrupts
(J
)) := True;
194 if State
(Exception_Interrupts
(J
)) /= Default
then
197 (Signal
(Exception_Interrupts
(J
)), act
'Unchecked_Access,
198 old_act
'Unchecked_Access);
199 pragma Assert
(Result
= 0);
204 if State
(Abort_Task_Interrupt
) /= User
then
205 Keep_Unmasked
(Abort_Task_Interrupt
) := True;
206 Reserve
(Abort_Task_Interrupt
) := True;
209 -- Set SIGINT to unmasked state as long as it's
210 -- not in "User" state. Check for Unreserve_All_Interrupts last
212 if State
(SIGINT
) /= User
then
213 Keep_Unmasked
(SIGINT
) := True;
214 Reserve
(SIGINT
) := True;
217 -- Check all signals for state that requires keeping them
218 -- unmasked and reserved
220 for J
in Interrupt_ID
'Range loop
221 if State
(J
) = Default
or else State
(J
) = Runtime
then
222 Keep_Unmasked
(J
) := True;
227 -- Add the set of signals that must always be unmasked for this target
229 for J
in Unmasked
'Range loop
230 Keep_Unmasked
(Interrupt_ID
(Unmasked
(J
))) := True;
231 Reserve
(Interrupt_ID
(Unmasked
(J
))) := True;
234 -- Add target-specific reserved signals
236 for J
in Reserved
'Range loop
237 Reserve
(Interrupt_ID
(Reserved
(J
))) := True;
240 -- Process pragma Unreserve_All_Interrupts. This overrides any
241 -- settings due to pragma Interrupt_State:
243 if Unreserve_All_Interrupts
/= 0 then
244 Keep_Unmasked
(SIGINT
) := False;
245 Reserve
(SIGINT
) := False;
248 -- We do not have Signal 0 in reality. We just use this value
249 -- to identify not existing signals (see s-intnam.ads). Therefore,
250 -- Signal 0 should not be used in all signal related operations hence
251 -- mark it as reserved.
256 end System
.Interrupt_Management
;