1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
|
------------------------------------------------------------------------------
-- --
-- GNU ADA 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) 1992-2002 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 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, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, 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 Solaris version of this package.
-- PLEASE DO NOT add any dependences on other packages.
-- This package is designed to work with or without tasking support.
-- 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.
with Interfaces.C;
-- used for int
with System.OS_Interface;
-- used for various Constants, Signal and types
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");
----------------------
-- 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 Warnings (Off, context);
begin
-- 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 =>
case info.si_code is
when FPE_INTDIV |
FPE_INTOVF |
FPE_FLTDIV |
FPE_FLTOVF |
FPE_FLTUND |
FPE_FLTRES |
FPE_FLTINV |
FPE_FLTSUB =>
raise Constraint_Error;
when others =>
pragma Assert (False);
null;
end case;
when SIGILL | SIGSEGV | SIGBUS =>
raise Storage_Error;
when others =>
pragma Assert (False);
null;
end case;
end Notify_Exception;
---------------------------
-- Initialize_Interrupts --
---------------------------
-- Nothing needs to be done on this platform.
procedure Initialize_Interrupts is
begin
null;
end Initialize_Interrupts;
----------------------------
-- Package Initialization --
----------------------------
begin
declare
act : aliased struct_sigaction;
old_act : aliased struct_sigaction;
mask : aliased sigset_t;
Result : Interfaces.C.int;
function State (Int : Interrupt_ID) return Character;
pragma Import (C, State, "__gnat_get_interrupt_state");
-- Get interrupt state. Defined in a-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)
begin
-- 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;
end System.Interrupt_Management;
|
