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
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
|
------------------------------------------------------------------------------
-- --
-- GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- SYSTEM.INTERRUPT_MANAGEMENT.OPERATIONS --
-- --
-- B o d y --
-- --
-- Copyright (C) 1991-1994, Florida State University --
-- Copyright (C) 1995-2003, Ada Core Technologies --
-- --
-- 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 POSIX-like version of this package.
-- Note: this file can only be used for POSIX compliant systems.
with Interfaces.C;
-- used for int
-- size_t
-- unsigned
with System.OS_Interface;
-- used for various type, constant, and operations
with System.Storage_Elements;
-- used for To_Address
-- Integer_Address
with Unchecked_Conversion;
package body System.Interrupt_Management.Operations is
use Interfaces.C;
use System.OS_Interface;
type Interrupt_Mask_Ptr is access all Interrupt_Mask;
function "+" is new
Unchecked_Conversion (Interrupt_Mask_Ptr, sigset_t_ptr);
---------------------
-- Local Variables --
---------------------
Initial_Action : array (Signal) of aliased struct_sigaction;
Default_Action : aliased struct_sigaction;
Ignore_Action : aliased struct_sigaction;
----------------------------
-- Thread_Block_Interrupt --
----------------------------
procedure Thread_Block_Interrupt
(Interrupt : Interrupt_ID)
is
Result : Interfaces.C.int;
Mask : aliased sigset_t;
begin
Result := sigemptyset (Mask'Access);
pragma Assert (Result = 0);
Result := sigaddset (Mask'Access, Signal (Interrupt));
pragma Assert (Result = 0);
Result := pthread_sigmask (SIG_BLOCK, Mask'Unchecked_Access, null);
pragma Assert (Result = 0);
end Thread_Block_Interrupt;
------------------------------
-- Thread_Unblock_Interrupt --
------------------------------
procedure Thread_Unblock_Interrupt
(Interrupt : Interrupt_ID)
is
Mask : aliased sigset_t;
Result : Interfaces.C.int;
begin
Result := sigemptyset (Mask'Access);
pragma Assert (Result = 0);
Result := sigaddset (Mask'Access, Signal (Interrupt));
pragma Assert (Result = 0);
Result := pthread_sigmask (SIG_UNBLOCK, Mask'Unchecked_Access, null);
pragma Assert (Result = 0);
end Thread_Unblock_Interrupt;
------------------------
-- Set_Interrupt_Mask --
------------------------
procedure Set_Interrupt_Mask (Mask : access Interrupt_Mask) is
Result : Interfaces.C.int;
begin
Result := pthread_sigmask
(SIG_SETMASK, +Interrupt_Mask_Ptr (Mask), null);
pragma Assert (Result = 0);
end Set_Interrupt_Mask;
procedure Set_Interrupt_Mask
(Mask : access Interrupt_Mask;
OMask : access Interrupt_Mask)
is
Result : Interfaces.C.int;
begin
Result := pthread_sigmask
(SIG_SETMASK, +Interrupt_Mask_Ptr (Mask), +Interrupt_Mask_Ptr (OMask));
pragma Assert (Result = 0);
end Set_Interrupt_Mask;
------------------------
-- Get_Interrupt_Mask --
------------------------
procedure Get_Interrupt_Mask (Mask : access Interrupt_Mask) is
Result : Interfaces.C.int;
begin
Result := pthread_sigmask
(SIG_SETMASK, null, +Interrupt_Mask_Ptr (Mask));
pragma Assert (Result = 0);
end Get_Interrupt_Mask;
--------------------
-- Interrupt_Wait --
--------------------
function Interrupt_Wait
(Mask : access Interrupt_Mask)
return Interrupt_ID
is
Result : Interfaces.C.int;
Sig : aliased Signal;
begin
Result := sigwait (Mask, Sig'Access);
if Result /= 0 then
return 0;
end if;
return Interrupt_ID (Sig);
end Interrupt_Wait;
----------------------------
-- Install_Default_Action --
----------------------------
procedure Install_Default_Action (Interrupt : Interrupt_ID) is
Result : Interfaces.C.int;
begin
Result := sigaction
(Signal (Interrupt),
Initial_Action (Signal (Interrupt))'Access, null);
pragma Assert (Result = 0);
end Install_Default_Action;
---------------------------
-- Install_Ignore_Action --
---------------------------
procedure Install_Ignore_Action (Interrupt : Interrupt_ID) is
Result : Interfaces.C.int;
begin
Result := sigaction (Signal (Interrupt), Ignore_Action'Access, null);
pragma Assert (Result = 0);
end Install_Ignore_Action;
-------------------------
-- Fill_Interrupt_Mask --
-------------------------
procedure Fill_Interrupt_Mask (Mask : access Interrupt_Mask) is
Result : Interfaces.C.int;
begin
Result := sigfillset (Mask);
pragma Assert (Result = 0);
end Fill_Interrupt_Mask;
--------------------------
-- Empty_Interrupt_Mask --
--------------------------
procedure Empty_Interrupt_Mask (Mask : access Interrupt_Mask) is
Result : Interfaces.C.int;
begin
Result := sigemptyset (Mask);
pragma Assert (Result = 0);
end Empty_Interrupt_Mask;
---------------------------
-- Add_To_Interrupt_Mask --
---------------------------
procedure Add_To_Interrupt_Mask
(Mask : access Interrupt_Mask;
Interrupt : Interrupt_ID)
is
Result : Interfaces.C.int;
begin
Result := sigaddset (Mask, Signal (Interrupt));
pragma Assert (Result = 0);
end Add_To_Interrupt_Mask;
--------------------------------
-- Delete_From_Interrupt_Mask --
--------------------------------
procedure Delete_From_Interrupt_Mask
(Mask : access Interrupt_Mask;
Interrupt : Interrupt_ID)
is
Result : Interfaces.C.int;
begin
Result := sigdelset (Mask, Signal (Interrupt));
pragma Assert (Result = 0);
end Delete_From_Interrupt_Mask;
---------------
-- Is_Member --
---------------
function Is_Member
(Mask : access Interrupt_Mask;
Interrupt : Interrupt_ID) return Boolean
is
Result : Interfaces.C.int;
begin
Result := sigismember (Mask, Signal (Interrupt));
pragma Assert (Result = 0 or else Result = 1);
return Result = 1;
end Is_Member;
-------------------------
-- Copy_Interrupt_Mask --
-------------------------
procedure Copy_Interrupt_Mask
(X : out Interrupt_Mask;
Y : Interrupt_Mask)
is
begin
X := Y;
end Copy_Interrupt_Mask;
----------------------------
-- Interrupt_Self_Process --
----------------------------
procedure Interrupt_Self_Process (Interrupt : Interrupt_ID) is
Result : Interfaces.C.int;
begin
Result := kill (getpid, Signal (Interrupt));
pragma Assert (Result = 0);
end Interrupt_Self_Process;
begin
declare
mask : aliased sigset_t;
allmask : aliased sigset_t;
Result : Interfaces.C.int;
begin
for Sig in 1 .. Signal'Last loop
Result := sigaction
(Sig, null, Initial_Action (Sig)'Unchecked_Access);
-- ??? [assert 1]
-- we can't check Result here since sigaction will fail on
-- SIGKILL, SIGSTOP, and possibly other signals
-- pragma Assert (Result = 0);
end loop;
-- Setup the masks to be exported.
Result := sigemptyset (mask'Access);
pragma Assert (Result = 0);
Result := sigfillset (allmask'Access);
pragma Assert (Result = 0);
Default_Action.sa_flags := 0;
Default_Action.sa_mask := mask;
Default_Action.sa_handler :=
Storage_Elements.To_Address
(Storage_Elements.Integer_Address (SIG_DFL));
Ignore_Action.sa_flags := 0;
Ignore_Action.sa_mask := mask;
Ignore_Action.sa_handler :=
Storage_Elements.To_Address
(Storage_Elements.Integer_Address (SIG_IGN));
for J in Interrupt_ID loop
-- We need to check whether J is in Keep_Unmasked because
-- the index type of the Keep_Unmasked array is not always
-- Interrupt_ID; it may be a subtype of Interrupt_ID.
if J in Keep_Unmasked'Range and then Keep_Unmasked (J) then
Result := sigaddset (mask'Access, Signal (J));
pragma Assert (Result = 0);
Result := sigdelset (allmask'Access, Signal (J));
pragma Assert (Result = 0);
end if;
end loop;
-- The Keep_Unmasked signals should be unmasked for Environment task
Result := pthread_sigmask (SIG_UNBLOCK, mask'Unchecked_Access, null);
pragma Assert (Result = 0);
-- Get the signal mask of the Environment Task
Result := pthread_sigmask (SIG_SETMASK, null, mask'Unchecked_Access);
pragma Assert (Result = 0);
-- Setup the constants exported
Environment_Mask := Interrupt_Mask (mask);
All_Tasks_Mask := Interrupt_Mask (allmask);
end;
end System.Interrupt_Management.Operations;
|
