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) 1992-2006 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.
43 package body System
.Interrupt_Management
is
46 use System
.OS_Interface
;
48 type Interrupt_List
is array (Interrupt_ID
range <>) of Interrupt_ID
;
50 Exception_Interrupts
: constant Interrupt_List
:=
51 (SIGFPE
, SIGILL
, SIGSEGV
, SIGBUS
);
53 Unreserve_All_Interrupts
: Interfaces
.C
.int
;
55 (C
, Unreserve_All_Interrupts
, "__gl_unreserve_all_interrupts");
57 function State
(Int
: Interrupt_ID
) return Character;
58 pragma Import
(C
, State
, "__gnat_get_interrupt_state");
59 -- Get interrupt state. Defined in init.c
60 -- The input argument is the interrupt number,
61 -- and the result is one of the following:
63 User
: constant Character := 'u';
64 Runtime
: constant Character := 'r';
65 Default
: constant Character := 's';
66 -- 'n' this interrupt not set by any Interrupt_State pragma
67 -- 'u' Interrupt_State pragma set state to User
68 -- 'r' Interrupt_State pragma set state to Runtime
69 -- 's' Interrupt_State pragma set state to System (use "default"
72 ----------------------
73 -- Notify_Exception --
74 ----------------------
76 -- This function identifies the Ada exception to be raised using
77 -- the information when the system received a synchronous signal.
78 -- Since this function is machine and OS dependent, different code
79 -- has to be provided for different target.
81 procedure Notify_Exception
83 info
: access siginfo_t
;
84 context
: access ucontext_t
);
86 ----------------------
87 -- Notify_Exception --
88 ----------------------
90 procedure Notify_Exception
92 info
: access siginfo_t
;
93 context
: access ucontext_t
)
95 pragma Unreferenced
(context
);
97 -- Check that treatment of exception propagation here
98 -- is consistent with treatment of the abort signal in
99 -- System.Task_Primitives.Operations.
113 raise Constraint_Error
;
116 pragma Assert
(False);
120 when SIGILL | SIGSEGV | SIGBUS
=>
124 pragma Assert
(False);
127 end Notify_Exception
;
133 Initialized
: Boolean := False;
135 procedure Initialize
is
136 act
: aliased struct_sigaction
;
137 old_act
: aliased struct_sigaction
;
138 mask
: aliased sigset_t
;
139 Result
: Interfaces
.C
.int
;
148 -- Need to call pthread_init very early because it is doing signal
153 -- Change this if you want to use another signal for task abort.
154 -- SIGTERM might be a good one.
156 Abort_Task_Interrupt
:= SIGABRT
;
158 act
.sa_handler
:= Notify_Exception
'Address;
160 -- Set sa_flags to SA_NODEFER so that during the handler execution
161 -- we do not change the Signal_Mask to be masked for the Signal.
162 -- This is a temporary fix to the problem that the Signal_Mask is
163 -- not restored after the exception (longjmp) from the handler.
164 -- The right fix should be made in sigsetjmp so that we save
165 -- the Signal_Set and restore it after a longjmp.
167 -- In that case, this field should be changed back to 0. ??? (Dong-Ik)
171 Result
:= sigemptyset
(mask
'Access);
172 pragma Assert
(Result
= 0);
174 -- ??? For the same reason explained above, we can't mask these
175 -- signals because otherwise we won't be able to catch more than
180 pragma Assert
(Keep_Unmasked
= (Interrupt_ID
'Range => False));
181 pragma Assert
(Reserve
= (Interrupt_ID
'Range => False));
183 for J
in Exception_Interrupts
'Range loop
184 if State
(Exception_Interrupts
(J
)) /= User
then
185 Keep_Unmasked
(Exception_Interrupts
(J
)) := True;
186 Reserve
(Exception_Interrupts
(J
)) := True;
188 if State
(Exception_Interrupts
(J
)) /= Default
then
191 (Signal
(Exception_Interrupts
(J
)), act
'Unchecked_Access,
192 old_act
'Unchecked_Access);
193 pragma Assert
(Result
= 0);
198 if State
(Abort_Task_Interrupt
) /= User
then
199 Keep_Unmasked
(Abort_Task_Interrupt
) := True;
200 Reserve
(Abort_Task_Interrupt
) := True;
203 -- Set SIGINT to unmasked state as long as it's
204 -- not in "User" state. Check for Unreserve_All_Interrupts last
206 if State
(SIGINT
) /= User
then
207 Keep_Unmasked
(SIGINT
) := True;
208 Reserve
(SIGINT
) := True;
211 -- Check all signals for state that requires keeping them
212 -- unmasked and reserved
214 for J
in Interrupt_ID
'Range loop
215 if State
(J
) = Default
or else State
(J
) = Runtime
then
216 Keep_Unmasked
(J
) := True;
221 -- Add the set of signals that must always be unmasked for this target
223 for J
in Unmasked
'Range loop
224 Keep_Unmasked
(Interrupt_ID
(Unmasked
(J
))) := True;
225 Reserve
(Interrupt_ID
(Unmasked
(J
))) := True;
228 -- Add target-specific reserved signals
230 for J
in Reserved
'Range loop
231 Reserve
(Interrupt_ID
(Reserved
(J
))) := True;
234 -- Process pragma Unreserve_All_Interrupts. This overrides any
235 -- settings due to pragma Interrupt_State:
237 if Unreserve_All_Interrupts
/= 0 then
238 Keep_Unmasked
(SIGINT
) := False;
239 Reserve
(SIGINT
) := False;
242 -- We do not have Signal 0 in reality. We just use this value
243 -- to identify not existing signals (see s-intnam.ads). Therefore,
244 -- Signal 0 should not be used in all signal related operations hence
245 -- mark it as reserved.
250 end System
.Interrupt_Management
;