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1 706 jeremybenn
------------------------------------------------------------------------------
2
--                                                                          --
3
--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --
4
--                                                                          --
5
--                   S Y S T E M . O S _ I N T E R F A C E                  --
6
--                                                                          --
7
--                                  S p e c                                 --
8
--                                                                          --
9
--             Copyright (C) 1991-1994, Florida State University            --
10
--          Copyright (C) 1995-2011, Free Software Foundation, Inc.         --
11
--                                                                          --
12
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
13
-- terms of the  GNU General Public License as published  by the Free Soft- --
14
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
15
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
16
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
17
-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
18
--                                                                          --
19
-- As a special exception under Section 7 of GPL version 3, you are granted --
20
-- additional permissions described in the GCC Runtime Library Exception,   --
21
-- version 3.1, as published by the Free Software Foundation.               --
22
--                                                                          --
23
-- You should have received a copy of the GNU General Public License and    --
24
-- a copy of the GCC Runtime Library Exception along with this program;     --
25
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
26
-- <http://www.gnu.org/licenses/>.                                          --
27
--                                                                          --
28
-- GNARL was developed by the GNARL team at Florida State University.       --
29
-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
30
--                                                                          --
31
------------------------------------------------------------------------------
32
 
33
--  This is Darwin pthreads version of this package
34
 
35
--  This package includes all direct interfaces to OS services that are needed
36
--  by the tasking run-time (libgnarl).
37
 
38
--  PLEASE DO NOT add any with-clauses to this package or remove the pragma
39
--  Elaborate_Body. It is designed to be a bottom-level (leaf) package.
40
 
41
with Interfaces.C;
42
with System.OS_Constants;
43
 
44
package System.OS_Interface is
45
   pragma Preelaborate;
46
 
47
   subtype int            is Interfaces.C.int;
48
   subtype short          is Interfaces.C.short;
49
   subtype long           is Interfaces.C.long;
50
   subtype unsigned       is Interfaces.C.unsigned;
51
   subtype unsigned_short is Interfaces.C.unsigned_short;
52
   subtype unsigned_long  is Interfaces.C.unsigned_long;
53
   subtype unsigned_char  is Interfaces.C.unsigned_char;
54
   subtype plain_char     is Interfaces.C.plain_char;
55
   subtype size_t         is Interfaces.C.size_t;
56
 
57
   -----------
58
   -- Errno --
59
   -----------
60
 
61
   function errno return int;
62
   pragma Import (C, errno, "__get_errno");
63
 
64
   EINTR     : constant := 4;
65
   ENOMEM    : constant := 12;
66
   EINVAL    : constant := 22;
67
   EAGAIN    : constant := 35;
68
   ETIMEDOUT : constant := 60;
69
 
70
   -------------
71
   -- Signals --
72
   -------------
73
 
74
   Max_Interrupt : constant := 31;
75
   type Signal is new int range 0 .. Max_Interrupt;
76
   for Signal'Size use int'Size;
77
 
78
   SIGHUP     : constant := 1; --  hangup
79
   SIGINT     : constant := 2; --  interrupt (rubout)
80
   SIGQUIT    : constant := 3; --  quit (ASCD FS)
81
   SIGILL     : constant := 4; --  illegal instruction (not reset)
82
   SIGTRAP    : constant := 5; --  trace trap (not reset)
83
   SIGIOT     : constant := 6; --  IOT instruction
84
   SIGABRT    : constant := 6; --  used by abort, replace SIGIOT in the  future
85
   SIGEMT     : constant := 7; --  EMT instruction
86
   SIGFPE     : constant := 8; --  floating point exception
87
   SIGKILL    : constant := 9; --  kill (cannot be caught or ignored)
88
   SIGBUS     : constant := 10; --  bus error
89
   SIGSEGV    : constant := 11; --  segmentation violation
90
   SIGSYS     : constant := 12; --  bad argument to system call
91
   SIGPIPE    : constant := 13; --  write on a pipe with no one to read it
92
   SIGALRM    : constant := 14; --  alarm clock
93
   SIGTERM    : constant := 15; --  software termination signal from kill
94
   SIGURG     : constant := 16; --  urgent condition on IO channel
95
   SIGSTOP    : constant := 17; --  stop (cannot be caught or ignored)
96
   SIGTSTP    : constant := 18; --  user stop requested from tty
97
   SIGCONT    : constant := 19; --  stopped process has been continued
98
   SIGCHLD    : constant := 20; --  child status change
99
   SIGTTIN    : constant := 21; --  background tty read attempted
100
   SIGTTOU    : constant := 22; --  background tty write attempted
101
   SIGIO      : constant := 23; --  I/O possible (Solaris SIGPOLL alias)
102
   SIGXCPU    : constant := 24; --  CPU time limit exceeded
103
   SIGXFSZ    : constant := 25; --  filesize limit exceeded
104
   SIGVTALRM  : constant := 26; --  virtual timer expired
105
   SIGPROF    : constant := 27; --  profiling timer expired
106
   SIGWINCH   : constant := 28; --  window size change
107
   SIGINFO    : constant := 29; --  information request
108
   SIGUSR1    : constant := 30; --  user defined signal 1
109
   SIGUSR2    : constant := 31; --  user defined signal 2
110
 
111
   SIGADAABORT : constant := SIGABRT;
112
   --  Change this if you want to use another signal for task abort.
113
   --  SIGTERM might be a good one.
114
 
115
   type Signal_Set is array (Natural range <>) of Signal;
116
 
117
   Unmasked : constant Signal_Set :=
118
                (SIGTTIN, SIGTTOU, SIGSTOP, SIGTSTP);
119
 
120
   Reserved : constant Signal_Set :=
121
                (SIGKILL, SIGSTOP);
122
 
123
   Exception_Signals : constant Signal_Set :=
124
                         (SIGFPE, SIGILL, SIGSEGV, SIGBUS);
125
   --  These signals (when runtime or system) will be caught and converted
126
   --  into an Ada exception.
127
 
128
   type sigset_t is private;
129
 
130
   function sigaddset (set : access sigset_t; sig : Signal) return int;
131
   pragma Import (C, sigaddset, "sigaddset");
132
 
133
   function sigdelset (set : access sigset_t; sig : Signal) return int;
134
   pragma Import (C, sigdelset, "sigdelset");
135
 
136
   function sigfillset (set : access sigset_t) return int;
137
   pragma Import (C, sigfillset, "sigfillset");
138
 
139
   function sigismember (set : access sigset_t; sig : Signal) return int;
140
   pragma Import (C, sigismember, "sigismember");
141
 
142
   function sigemptyset (set : access sigset_t) return int;
143
   pragma Import (C, sigemptyset, "sigemptyset");
144
 
145
   type siginfo_t is private;
146
   type ucontext_t is private;
147
 
148
   type Signal_Handler is access procedure
149
     (signo   : Signal;
150
      info    : access siginfo_t;
151
      context : access ucontext_t);
152
 
153
   type struct_sigaction is record
154
      sa_handler : System.Address;
155
      sa_mask    : sigset_t;
156
      sa_flags   : int;
157
   end record;
158
   pragma Convention (C, struct_sigaction);
159
   type struct_sigaction_ptr is access all struct_sigaction;
160
 
161
   SIG_BLOCK   : constant := 1;
162
   SIG_UNBLOCK : constant := 2;
163
   SIG_SETMASK : constant := 3;
164
 
165
   SIG_DFL : constant := 0;
166
   SIG_IGN : constant := 1;
167
 
168
   SA_SIGINFO : constant := 16#0040#;
169
   SA_ONSTACK : constant := 16#0001#;
170
 
171
   function sigaction
172
     (sig  : Signal;
173
      act  : struct_sigaction_ptr;
174
      oact : struct_sigaction_ptr) return int;
175
   pragma Import (C, sigaction, "sigaction");
176
 
177
   ----------
178
   -- Time --
179
   ----------
180
 
181
   Time_Slice_Supported : constant Boolean := True;
182
   --  Indicates whether time slicing is supported
183
 
184
   type timespec is private;
185
 
186
   type clockid_t is new int;
187
 
188
   function clock_gettime
189
     (clock_id : clockid_t;
190
      tp       : access timespec) return int;
191
 
192
   function To_Duration (TS : timespec) return Duration;
193
   pragma Inline (To_Duration);
194
 
195
   function To_Timespec (D : Duration) return timespec;
196
   pragma Inline (To_Timespec);
197
 
198
   -------------------------
199
   -- Priority Scheduling --
200
   -------------------------
201
 
202
   SCHED_OTHER : constant := 1;
203
   SCHED_RR    : constant := 2;
204
   SCHED_FIFO  : constant := 4;
205
 
206
   function To_Target_Priority
207
     (Prio : System.Any_Priority) return Interfaces.C.int;
208
   --  Maps System.Any_Priority to a POSIX priority
209
 
210
   -------------
211
   -- Process --
212
   -------------
213
 
214
   type pid_t is private;
215
 
216
   function kill (pid : pid_t; sig : Signal) return int;
217
   pragma Import (C, kill, "kill");
218
 
219
   function getpid return pid_t;
220
   pragma Import (C, getpid, "getpid");
221
 
222
   ---------
223
   -- LWP --
224
   ---------
225
 
226
   function lwp_self return System.Address;
227
   --  Return the mach thread bound to the current thread.  The value is not
228
   --  used by the run-time library but made available to debuggers.
229
 
230
   -------------
231
   -- Threads --
232
   -------------
233
 
234
   type Thread_Body is access
235
     function (arg : System.Address) return System.Address;
236
   pragma Convention (C, Thread_Body);
237
 
238
   type pthread_t           is private;
239
   subtype Thread_Id        is pthread_t;
240
 
241
   type pthread_mutex_t     is limited private;
242
   type pthread_cond_t      is limited private;
243
   type pthread_attr_t      is limited private;
244
   type pthread_mutexattr_t is limited private;
245
   type pthread_condattr_t  is limited private;
246
   type pthread_key_t       is private;
247
 
248
   type pthread_mutex_ptr is access all pthread_mutex_t;
249
   type pthread_cond_ptr is access all pthread_cond_t;
250
 
251
   PTHREAD_CREATE_DETACHED : constant := 2;
252
 
253
   PTHREAD_SCOPE_PROCESS : constant := 2;
254
   PTHREAD_SCOPE_SYSTEM  : constant := 1;
255
 
256
   --  Read/Write lock not supported on Darwin. To add support both types
257
   --  pthread_rwlock_t and pthread_rwlockattr_t must properly be defined
258
   --  with the associated routines pthread_rwlock_[init/destroy] and
259
   --  pthread_rwlock_[rdlock/wrlock/unlock].
260
 
261
   subtype pthread_rwlock_t     is pthread_mutex_t;
262
   subtype pthread_rwlockattr_t is pthread_mutexattr_t;
263
 
264
   -----------
265
   -- Stack --
266
   -----------
267
 
268
   type stack_t is record
269
      ss_sp    : System.Address;
270
      ss_size  : size_t;
271
      ss_flags : int;
272
   end record;
273
   pragma Convention (C, stack_t);
274
 
275
   function sigaltstack
276
     (ss  : not null access stack_t;
277
      oss : access stack_t) return int;
278
   pragma Import (C, sigaltstack, "sigaltstack");
279
 
280
   Alternate_Stack : aliased System.Address;
281
   pragma Import (C, Alternate_Stack, "__gnat_alternate_stack");
282
   --  The alternate signal stack for stack overflows
283
 
284
   Alternate_Stack_Size : constant := 32 * 1024;
285
   --  This must be in keeping with init.c:__gnat_alternate_stack
286
 
287
   Stack_Base_Available : constant Boolean := False;
288
   --  Indicates whether the stack base is available on this target. This
289
   --  allows us to share s-osinte.adb between all the FSU run time. Note that
290
   --  this value can only be true if pthread_t has a complete definition that
291
   --  corresponds exactly to the C header files.
292
 
293
   function Get_Stack_Base (thread : pthread_t) return System.Address;
294
   pragma Inline (Get_Stack_Base);
295
   --  returns the stack base of the specified thread. Only call this function
296
   --  when Stack_Base_Available is True.
297
 
298
   function Get_Page_Size return size_t;
299
   function Get_Page_Size return System.Address;
300
   pragma Import (C, Get_Page_Size, "getpagesize");
301
   --  Returns the size of a page
302
 
303
   PROT_NONE  : constant := 0;
304
   PROT_READ  : constant := 1;
305
   PROT_WRITE : constant := 2;
306
   PROT_EXEC  : constant := 4;
307
   PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
308
 
309
   PROT_ON    : constant := PROT_NONE;
310
   PROT_OFF   : constant := PROT_ALL;
311
 
312
   function mprotect
313
     (addr : System.Address;
314
      len  : size_t;
315
      prot : int) return int;
316
   pragma Import (C, mprotect);
317
 
318
   ---------------------------------------
319
   -- Nonstandard Thread Initialization --
320
   ---------------------------------------
321
 
322
   procedure pthread_init;
323
 
324
   -------------------------
325
   -- POSIX.1c  Section 3 --
326
   -------------------------
327
 
328
   function sigwait (set : access sigset_t; sig : access Signal) return int;
329
   pragma Import (C, sigwait, "sigwait");
330
 
331
   function pthread_kill (thread : pthread_t; sig : Signal) return int;
332
   pragma Import (C, pthread_kill, "pthread_kill");
333
 
334
   function pthread_sigmask
335
     (how  : int;
336
      set  : access sigset_t;
337
      oset : access sigset_t) return int;
338
   pragma Import (C, pthread_sigmask, "pthread_sigmask");
339
 
340
   --------------------------
341
   -- POSIX.1c  Section 11 --
342
   --------------------------
343
 
344
   function pthread_mutexattr_init
345
     (attr : access pthread_mutexattr_t) return int;
346
   pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
347
 
348
   function pthread_mutexattr_destroy
349
     (attr : access pthread_mutexattr_t) return int;
350
   pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
351
 
352
   function pthread_mutex_init
353
     (mutex : access pthread_mutex_t;
354
      attr  : access pthread_mutexattr_t) return int;
355
   pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
356
 
357
   function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
358
   pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
359
 
360
   function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
361
   pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
362
 
363
   function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
364
   pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
365
 
366
   function pthread_condattr_init
367
     (attr : access pthread_condattr_t) return int;
368
   pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
369
 
370
   function pthread_condattr_destroy
371
     (attr : access pthread_condattr_t) return int;
372
   pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
373
 
374
   function pthread_cond_init
375
     (cond : access pthread_cond_t;
376
      attr : access pthread_condattr_t) return int;
377
   pragma Import (C, pthread_cond_init, "pthread_cond_init");
378
 
379
   function pthread_cond_destroy (cond : access pthread_cond_t) return int;
380
   pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
381
 
382
   function pthread_cond_signal (cond : access pthread_cond_t) return int;
383
   pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
384
 
385
   function pthread_cond_wait
386
     (cond  : access pthread_cond_t;
387
      mutex : access pthread_mutex_t) return int;
388
   pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
389
 
390
   function pthread_cond_timedwait
391
     (cond    : access pthread_cond_t;
392
      mutex   : access pthread_mutex_t;
393
      abstime : access timespec) return int;
394
   pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
395
 
396
   Relative_Timed_Wait : constant Boolean := False;
397
   --  pthread_cond_timedwait requires an absolute delay time
398
 
399
   --------------------------
400
   -- POSIX.1c  Section 13 --
401
   --------------------------
402
 
403
   PTHREAD_PRIO_NONE    : constant := 0;
404
   PTHREAD_PRIO_INHERIT : constant := 1;
405
   PTHREAD_PRIO_PROTECT : constant := 2;
406
 
407
   function pthread_mutexattr_setprotocol
408
     (attr     : access pthread_mutexattr_t;
409
      protocol : int) return int;
410
   pragma Import
411
     (C, pthread_mutexattr_setprotocol, "pthread_mutexattr_setprotocol");
412
 
413
   function pthread_mutexattr_setprioceiling
414
     (attr     : access pthread_mutexattr_t;
415
      prioceiling : int) return int;
416
   pragma Import
417
     (C, pthread_mutexattr_setprioceiling,
418
      "pthread_mutexattr_setprioceiling");
419
 
420
   type padding is array (int range <>) of Interfaces.C.char;
421
 
422
   type struct_sched_param is record
423
      sched_priority : int;  --  scheduling priority
424
      opaque         : padding (1 .. 4);
425
   end record;
426
   pragma Convention (C, struct_sched_param);
427
 
428
   function pthread_setschedparam
429
     (thread : pthread_t;
430
      policy : int;
431
      param  : access struct_sched_param) return int;
432
   pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
433
 
434
   function pthread_attr_setscope
435
     (attr            : access pthread_attr_t;
436
      contentionscope : int) return int;
437
   pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
438
 
439
   function pthread_attr_setinheritsched
440
     (attr            : access pthread_attr_t;
441
      inheritsched : int) return int;
442
   pragma Import
443
     (C, pthread_attr_setinheritsched, "pthread_attr_setinheritsched");
444
 
445
   function pthread_attr_setschedpolicy
446
     (attr   : access pthread_attr_t;
447
      policy : int) return int;
448
   pragma Import (C, pthread_attr_setschedpolicy, "pthread_attr_setsched");
449
 
450
   function sched_yield return int;
451
 
452
   ---------------------------
453
   -- P1003.1c - Section 16 --
454
   ---------------------------
455
 
456
   function pthread_attr_init (attributes : access pthread_attr_t) return int;
457
   pragma Import (C, pthread_attr_init, "pthread_attr_init");
458
 
459
   function pthread_attr_destroy
460
     (attributes : access pthread_attr_t) return int;
461
   pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
462
 
463
   function pthread_attr_setdetachstate
464
     (attr        : access pthread_attr_t;
465
      detachstate : int) return int;
466
   pragma Import
467
     (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
468
 
469
   function pthread_attr_setstacksize
470
     (attr      : access pthread_attr_t;
471
      stacksize : size_t) return int;
472
   pragma Import
473
     (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
474
 
475
   function pthread_create
476
     (thread        : access pthread_t;
477
      attributes    : access pthread_attr_t;
478
      start_routine : Thread_Body;
479
      arg           : System.Address) return int;
480
   pragma Import (C, pthread_create, "pthread_create");
481
 
482
   procedure pthread_exit (status : System.Address);
483
   pragma Import (C, pthread_exit, "pthread_exit");
484
 
485
   function pthread_self return pthread_t;
486
   pragma Import (C, pthread_self, "pthread_self");
487
 
488
   --------------------------
489
   -- POSIX.1c  Section 17 --
490
   --------------------------
491
 
492
   function pthread_setspecific
493
     (key   : pthread_key_t;
494
      value : System.Address) return int;
495
   pragma Import (C, pthread_setspecific, "pthread_setspecific");
496
 
497
   function pthread_getspecific (key : pthread_key_t) return System.Address;
498
   pragma Import (C, pthread_getspecific, "pthread_getspecific");
499
 
500
   type destructor_pointer is access procedure (arg : System.Address);
501
   pragma Convention (C, destructor_pointer);
502
 
503
   function pthread_key_create
504
     (key        : access pthread_key_t;
505
      destructor : destructor_pointer) return int;
506
   pragma Import (C, pthread_key_create, "pthread_key_create");
507
 
508
private
509
 
510
   type sigset_t is new unsigned;
511
 
512
   type int32_t is new int;
513
 
514
   type pid_t is new int32_t;
515
 
516
   type time_t is new long;
517
 
518
   type timespec is record
519
      tv_sec  : time_t;
520
      tv_nsec : long;
521
   end record;
522
   pragma Convention (C, timespec);
523
 
524
   --
525
   --  Darwin specific signal implementation
526
   --
527
   type Pad_Type is array (1 .. 7) of unsigned_long;
528
   type siginfo_t is record
529
      si_signo  : int;               --  signal number
530
      si_errno  : int;               --  errno association
531
      si_code   : int;               --  signal code
532
      si_pid    : int;               --  sending process
533
      si_uid    : unsigned;          --  sender's ruid
534
      si_status : int;               --  exit value
535
      si_addr   : System.Address;    --  faulting instruction
536
      si_value  : System.Address;    --  signal value
537
      si_band   : long;              --  band event for SIGPOLL
538
      pad       : Pad_Type;          --  RFU
539
   end record;
540
   pragma Convention (C, siginfo_t);
541
 
542
   type mcontext_t is new System.Address;
543
 
544
   type ucontext_t is record
545
      uc_onstack  : int;
546
      uc_sigmask  : sigset_t;         --  Signal Mask Used By This Context
547
      uc_stack    : stack_t;          --  Stack Used By This Context
548
      uc_link     : System.Address;   --  Pointer To Resuming Context
549
      uc_mcsize   : size_t;           --  Size of The Machine Context
550
      uc_mcontext : mcontext_t;       --  Machine Specific Context
551
   end record;
552
   pragma Convention (C, ucontext_t);
553
 
554
   --
555
   --  Darwin specific pthread implementation
556
   --
557
   type pthread_t is new System.Address;
558
 
559
   type pthread_attr_t is record
560
      sig    : long;
561
      opaque : padding (1 .. System.OS_Constants.PTHREAD_ATTR_SIZE);
562
   end record;
563
   pragma Convention (C, pthread_attr_t);
564
 
565
   type pthread_mutexattr_t is record
566
      sig    : long;
567
      opaque : padding (1 .. System.OS_Constants.PTHREAD_MUTEXATTR_SIZE);
568
   end record;
569
   pragma Convention (C, pthread_mutexattr_t);
570
 
571
   type pthread_mutex_t is record
572
      sig    : long;
573
      opaque : padding (1 .. System.OS_Constants.PTHREAD_MUTEX_SIZE);
574
   end record;
575
   pragma Convention (C, pthread_mutex_t);
576
 
577
   type pthread_condattr_t is record
578
      sig    : long;
579
      opaque : padding (1 .. System.OS_Constants.PTHREAD_CONDATTR_SIZE);
580
   end record;
581
   pragma Convention (C, pthread_condattr_t);
582
 
583
   type pthread_cond_t is record
584
      sig    : long;
585
      opaque : padding (1 .. System.OS_Constants.PTHREAD_COND_SIZE);
586
   end record;
587
   pragma Convention (C, pthread_cond_t);
588
 
589
   type pthread_once_t is record
590
      sig    : long;
591
      opaque : padding (1 .. System.OS_Constants.PTHREAD_ONCE_SIZE);
592
   end record;
593
   pragma Convention (C, pthread_once_t);
594
 
595
   type pthread_key_t is new unsigned_long;
596
 
597
end System.OS_Interface;

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