1------------------------------------------------------------------------------
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) 1991-2017, Florida State University          --
10--            Copyright (C) 1995-2019, 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 a HPUX 11.0 (Native THREADS) version of this package
34
35--  This package encapsulates all direct interfaces to OS services that are
36--  needed by the tasking run-time (libgnarl).
37
38--  PLEASE DO NOT add any with-clauses to this package or remove the pragma
39--  Preelaborate. This package is designed to be a bottom-level (leaf) package.
40
41with Ada.Unchecked_Conversion;
42
43with Interfaces.C;
44
45package System.OS_Interface is
46   pragma Preelaborate;
47
48   pragma Linker_Options ("-lpthread");
49
50   subtype int            is Interfaces.C.int;
51   subtype short          is Interfaces.C.short;
52   subtype long           is Interfaces.C.long;
53   subtype unsigned       is Interfaces.C.unsigned;
54   subtype unsigned_short is Interfaces.C.unsigned_short;
55   subtype unsigned_long  is Interfaces.C.unsigned_long;
56   subtype unsigned_char  is Interfaces.C.unsigned_char;
57   subtype plain_char     is Interfaces.C.plain_char;
58   subtype size_t         is Interfaces.C.size_t;
59
60   -----------
61   -- Errno --
62   -----------
63
64   function errno return int;
65   pragma Import (C, errno, "__get_errno");
66
67   EAGAIN    : constant := 11;
68   EINTR     : constant := 4;
69   EINVAL    : constant := 22;
70   ENOMEM    : constant := 12;
71   ETIMEDOUT : constant := 238;
72
73   -------------
74   -- Signals --
75   -------------
76
77   Max_Interrupt : constant := 44;
78   type Signal is new int range 0 .. Max_Interrupt;
79   for Signal'Size use int'Size;
80
81   SIGHUP     : constant := 1; --  hangup
82   SIGINT     : constant := 2; --  interrupt (rubout)
83   SIGQUIT    : constant := 3; --  quit (ASCD FS)
84   SIGILL     : constant := 4; --  illegal instruction (not reset)
85   SIGTRAP    : constant := 5; --  trace trap (not reset)
86   SIGIOT     : constant := 6; --  IOT instruction
87   SIGABRT    : constant := 6; --  used by abort, replace SIGIOT in the future
88   SIGEMT     : constant := 7; --  EMT instruction
89   SIGFPE     : constant := 8; --  floating point exception
90   SIGKILL    : constant := 9; --  kill (cannot be caught or ignored)
91   SIGBUS     : constant := 10; --  bus error
92   SIGSEGV    : constant := 11; --  segmentation violation
93   SIGSYS     : constant := 12; --  bad argument to system call
94   SIGPIPE    : constant := 13; --  write on a pipe with no one to read it
95   SIGALRM    : constant := 14; --  alarm clock
96   SIGTERM    : constant := 15; --  software termination signal from kill
97   SIGUSR1    : constant := 16; --  user defined signal 1
98   SIGUSR2    : constant := 17; --  user defined signal 2
99   SIGCLD     : constant := 18; --  alias for SIGCHLD
100   SIGCHLD    : constant := 18; --  child status change
101   SIGPWR     : constant := 19; --  power-fail restart
102   SIGVTALRM  : constant := 20; --  virtual timer alarm
103   SIGPROF    : constant := 21; --  profiling timer alarm
104   SIGIO      : constant := 22; --  asynchronous I/O
105   SIGPOLL    : constant := 22; --  pollable event occurred
106   SIGWINCH   : constant := 23; --  window size change
107   SIGSTOP    : constant := 24; --  stop (cannot be caught or ignored)
108   SIGTSTP    : constant := 25; --  user stop requested from tty
109   SIGCONT    : constant := 26; --  stopped process has been continued
110   SIGTTIN    : constant := 27; --  background tty read attempted
111   SIGTTOU    : constant := 28; --  background tty write attempted
112   SIGURG     : constant := 29; --  urgent condition on IO channel
113   SIGLOST    : constant := 30; --  remote lock lost  (NFS)
114   SIGDIL     : constant := 32; --  DIL signal
115   SIGXCPU    : constant := 33; --  CPU time limit exceeded (setrlimit)
116   SIGXFSZ    : constant := 34; --  file size limit exceeded (setrlimit)
117   SIGCANCEL  : constant := 35; --  used for pthread cancellation.
118   SIGGFAULT  : constant := 36; --  Graphics framebuffer fault
119
120   SIGADAABORT : constant := SIGABRT;
121   --  Note: on other targets, we usually use SIGABRT, but on HPUX, it
122   --  appears that SIGABRT can't be used in sigwait(), so we use SIGTERM.
123   --  Do we use SIGTERM or SIGABRT???
124
125   type Signal_Set is array (Natural range <>) of Signal;
126
127   Unmasked    : constant Signal_Set :=
128     (SIGABRT, SIGPIPE, SIGBUS, SIGTRAP, SIGTTIN, SIGTTOU, SIGTSTP, SIGPROF,
129      SIGALRM, SIGVTALRM, SIGIO, SIGCHLD);
130
131   Reserved    : constant Signal_Set := (SIGKILL, SIGSTOP);
132
133   type sigset_t is private;
134
135   function sigaddset (set : access sigset_t; sig : Signal) return int;
136   pragma Import (C, sigaddset, "sigaddset");
137
138   function sigdelset (set : access sigset_t; sig : Signal) return int;
139   pragma Import (C, sigdelset, "sigdelset");
140
141   function sigfillset (set : access sigset_t) return int;
142   pragma Import (C, sigfillset, "sigfillset");
143
144   function sigismember (set : access sigset_t; sig : Signal) return int;
145   pragma Import (C, sigismember, "sigismember");
146
147   function sigemptyset (set : access sigset_t) return int;
148   pragma Import (C, sigemptyset, "sigemptyset");
149
150   type struct_sigaction is record
151      sa_handler : System.Address;
152      sa_mask    : sigset_t;
153      sa_flags   : int;
154   end record;
155   pragma Convention (C, struct_sigaction);
156   type struct_sigaction_ptr is access all struct_sigaction;
157
158   SA_SIGINFO : constant := 16#10#;
159   SA_ONSTACK : constant := 16#01#;
160
161   SIG_BLOCK   : constant := 0;
162   SIG_UNBLOCK : constant := 1;
163   SIG_SETMASK : constant := 2;
164
165   SIG_DFL : constant := 0;
166   SIG_IGN : constant := 1;
167
168   function sigaction
169     (sig  : Signal;
170      act  : struct_sigaction_ptr;
171      oact : struct_sigaction_ptr) return int;
172   pragma Import (C, sigaction, "sigaction");
173
174   ----------
175   -- Time --
176   ----------
177
178   Time_Slice_Supported : constant Boolean := True;
179   --  Indicates whether time slicing is supported
180
181   type timespec is private;
182
183   type clockid_t is new int;
184
185   function clock_gettime
186     (clock_id : clockid_t;
187      tp       : access timespec) return int;
188   pragma Import (C, clock_gettime, "clock_gettime");
189
190   function clock_getres
191     (clock_id : clockid_t;
192      res      : access timespec) return int;
193   pragma Import (C, clock_getres, "clock_getres");
194
195   function To_Duration (TS : timespec) return Duration;
196   pragma Inline (To_Duration);
197
198   function To_Timespec (D : Duration) return timespec;
199   pragma Inline (To_Timespec);
200
201   type struct_timezone is record
202      tz_minuteswest : int;
203      tz_dsttime     : int;
204   end record;
205   pragma Convention (C, struct_timezone);
206   type struct_timezone_ptr is access all struct_timezone;
207
208   -------------------------
209   -- Priority Scheduling --
210   -------------------------
211
212   SCHED_FIFO  : constant := 0;
213   SCHED_RR    : constant := 1;
214   SCHED_OTHER : constant := 2;
215
216   function To_Target_Priority
217     (Prio : System.Any_Priority) return Interfaces.C.int;
218   --  Maps System.Any_Priority to a POSIX priority
219
220   -------------
221   -- Process --
222   -------------
223
224   type pid_t is private;
225
226   function kill (pid : pid_t; sig : Signal) return int;
227   pragma Import (C, kill, "kill");
228
229   function getpid return pid_t;
230   pragma Import (C, getpid, "getpid");
231
232   ---------
233   -- LWP --
234   ---------
235
236   function lwp_self return System.Address;
237   pragma Import (C, lwp_self, "_lwp_self");
238
239   -------------
240   -- Threads --
241   -------------
242
243   type Thread_Body is access
244     function (arg : System.Address) return System.Address;
245   pragma Convention (C, Thread_Body);
246
247   function Thread_Body_Access is new
248     Ada.Unchecked_Conversion (System.Address, Thread_Body);
249
250   type pthread_t           is private;
251   subtype Thread_Id        is pthread_t;
252
253   type pthread_mutex_t     is limited private;
254   type pthread_cond_t      is limited private;
255   type pthread_attr_t      is limited private;
256   type pthread_mutexattr_t is limited private;
257   type pthread_condattr_t  is limited private;
258   type pthread_key_t       is private;
259
260   PTHREAD_CREATE_DETACHED : constant := 16#de#;
261
262   PTHREAD_SCOPE_PROCESS : constant := 2;
263   PTHREAD_SCOPE_SYSTEM  : constant := 1;
264
265   --  Read/Write lock not supported on HPUX. To add support both types
266   --  pthread_rwlock_t and pthread_rwlockattr_t must properly be defined
267   --  with the associated routines pthread_rwlock_[init/destroy] and
268   --  pthread_rwlock_[rdlock/wrlock/unlock].
269
270   subtype pthread_rwlock_t     is pthread_mutex_t;
271   subtype pthread_rwlockattr_t is pthread_mutexattr_t;
272
273   -----------
274   -- Stack --
275   -----------
276
277   type stack_t is record
278      ss_sp    : System.Address;
279      ss_flags : int;
280      ss_size  : size_t;
281   end record;
282   pragma Convention (C, stack_t);
283
284   function sigaltstack
285     (ss  : not null access stack_t;
286      oss : access stack_t) return int;
287   pragma Import (C, sigaltstack, "sigaltstack");
288
289   Alternate_Stack : aliased System.Address;
290   pragma Import (C, Alternate_Stack, "__gnat_alternate_stack");
291   --  The alternate signal stack for stack overflows
292
293   Alternate_Stack_Size : constant := 128 * 1024;
294   --  This must be in keeping with init.c:__gnat_alternate_stack
295
296   Stack_Base_Available : constant Boolean := False;
297   --  Indicates whether the stack base is available on this target
298
299   function Get_Stack_Base (thread : pthread_t) return Address;
300   pragma Inline (Get_Stack_Base);
301   --  Returns the stack base of the specified thread. Only call this function
302   --  when Stack_Base_Available is True.
303
304   function Get_Page_Size return int;
305   pragma Import (C, Get_Page_Size, "getpagesize");
306   --  Returns the size of a page
307
308   PROT_NONE  : constant := 0;
309   PROT_READ  : constant := 1;
310   PROT_WRITE : constant := 2;
311   PROT_EXEC  : constant := 4;
312   PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
313   PROT_ON    : constant := PROT_READ;
314   PROT_OFF   : constant := PROT_ALL;
315
316   function mprotect (addr : Address; len : size_t; prot : int) return int;
317   pragma Import (C, mprotect);
318
319   ---------------------------------------
320   -- Nonstandard Thread Initialization --
321   ---------------------------------------
322
323   procedure pthread_init;
324   pragma Inline (pthread_init);
325   --  This is a dummy procedure to share some GNULLI files
326
327   -------------------------
328   -- POSIX.1c  Section 3 --
329   -------------------------
330
331   function sigwait
332     (set : access sigset_t;
333      sig : access Signal) return int;
334   pragma Import (C, sigwait, "sigwait");
335
336   function pthread_kill
337     (thread : pthread_t;
338      sig    : Signal) return int;
339   pragma Import (C, pthread_kill, "pthread_kill");
340
341   function pthread_sigmask
342     (how  : int;
343      set  : access sigset_t;
344      oset : access sigset_t) return int;
345   pragma Import (C, pthread_sigmask, "pthread_sigmask");
346
347   --------------------------
348   -- POSIX.1c  Section 11 --
349   --------------------------
350
351   function pthread_mutexattr_init
352     (attr : access pthread_mutexattr_t) return int;
353   pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
354
355   function pthread_mutexattr_destroy
356     (attr : access pthread_mutexattr_t) return int;
357   pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
358
359   function pthread_mutex_init
360     (mutex : access pthread_mutex_t;
361      attr  : access pthread_mutexattr_t) return int;
362   pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
363
364   function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
365   pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
366
367   function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
368   pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
369
370   function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
371   pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
372
373   function pthread_condattr_init
374     (attr : access pthread_condattr_t) return int;
375   pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
376
377   function pthread_condattr_destroy
378     (attr : access pthread_condattr_t) return int;
379   pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
380
381   function pthread_cond_init
382     (cond : access pthread_cond_t;
383      attr : access pthread_condattr_t) return int;
384   pragma Import (C, pthread_cond_init, "pthread_cond_init");
385
386   function pthread_cond_destroy (cond : access pthread_cond_t) return int;
387   pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
388
389   function pthread_cond_signal (cond : access pthread_cond_t) return int;
390   pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
391
392   function pthread_cond_wait
393     (cond  : access pthread_cond_t;
394      mutex : access pthread_mutex_t) return int;
395   pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
396
397   function pthread_cond_timedwait
398     (cond    : access pthread_cond_t;
399      mutex   : access pthread_mutex_t;
400      abstime : access timespec) return int;
401   pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
402
403   --------------------------
404   -- POSIX.1c  Section 13 --
405   --------------------------
406
407   PTHREAD_PRIO_NONE    : constant := 16#100#;
408   PTHREAD_PRIO_PROTECT : constant := 16#200#;
409   PTHREAD_PRIO_INHERIT : constant := 16#400#;
410
411   function pthread_mutexattr_setprotocol
412     (attr     : access pthread_mutexattr_t;
413      protocol : int) return int;
414   pragma Import (C, pthread_mutexattr_setprotocol);
415
416   function pthread_mutexattr_setprioceiling
417     (attr     : access pthread_mutexattr_t;
418      prioceiling : int) return int;
419   pragma Import (C, pthread_mutexattr_setprioceiling);
420
421   type Array_7_Int is array (0 .. 6) of int;
422   type struct_sched_param is record
423      sched_priority : int;
424      sched_reserved : Array_7_Int;
425   end record;
426
427   function pthread_setschedparam
428     (thread : pthread_t;
429      policy : int;
430      param  : access struct_sched_param)
431     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 (C, pthread_attr_setinheritsched);
443
444   function pthread_attr_setschedpolicy
445     (attr   : access pthread_attr_t;
446      policy : int) return int;
447   pragma Import (C, pthread_attr_setschedpolicy);
448
449   function sched_yield return int;
450   pragma Import (C, sched_yield, "sched_yield");
451
452   --------------------------
453   -- P1003.1c  Section 16 --
454   --------------------------
455
456   function pthread_attr_init
457     (attributes : access pthread_attr_t) return int;
458   pragma Import (C, pthread_attr_init, "__pthread_attr_init_system");
459
460   function pthread_attr_destroy
461     (attributes : access pthread_attr_t) return int;
462   pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
463
464   function pthread_attr_setdetachstate
465     (attr        : access pthread_attr_t;
466      detachstate : int) return int;
467   pragma Import (C, pthread_attr_setdetachstate);
468
469   function pthread_attr_setstacksize
470     (attr      : access pthread_attr_t;
471      stacksize : size_t) return int;
472   pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
473
474   function pthread_create
475     (thread        : access pthread_t;
476      attributes    : access pthread_attr_t;
477      start_routine : Thread_Body;
478      arg           : System.Address) return int;
479   pragma Import (C, pthread_create, "__pthread_create_system");
480
481   procedure pthread_exit (status : System.Address);
482   pragma Import (C, pthread_exit, "pthread_exit");
483
484   function pthread_self return pthread_t;
485   pragma Import (C, pthread_self, "pthread_self");
486
487   --------------------------
488   -- POSIX.1c  Section 17 --
489   --------------------------
490
491   function pthread_setspecific
492     (key   : pthread_key_t;
493      value : System.Address) return int;
494   pragma Import (C, pthread_setspecific, "pthread_setspecific");
495
496   function pthread_getspecific (key : pthread_key_t) return System.Address;
497   pragma Import (C, pthread_getspecific, "pthread_getspecific");
498
499   type destructor_pointer is access procedure (arg : System.Address);
500   pragma Convention (C, destructor_pointer);
501
502   function pthread_key_create
503     (key        : access pthread_key_t;
504      destructor : destructor_pointer) return int;
505   pragma Import (C, pthread_key_create, "pthread_key_create");
506
507private
508
509   type unsigned_int_array_8 is array (0 .. 7) of unsigned;
510   type sigset_t is record
511      sigset : unsigned_int_array_8;
512   end record;
513   pragma Convention (C_Pass_By_Copy, sigset_t);
514
515   type pid_t is new int;
516
517   type time_t is new long;
518
519   type timespec is record
520      tv_sec  : time_t;
521      tv_nsec : long;
522   end record;
523   pragma Convention (C, timespec);
524
525   type pthread_attr_t is new int;
526   type pthread_condattr_t is new int;
527   type pthread_mutexattr_t is new int;
528   type pthread_t is new int;
529
530   type short_array is array (Natural range <>) of short;
531   type int_array is array (Natural range <>) of int;
532
533   type pthread_mutex_t is record
534      m_short : short_array (0 .. 1);
535      m_int   : int;
536      m_int1  : int_array (0 .. 3);
537      m_pad   : int;
538
539      m_ptr : int;
540      --  actually m_ptr is a void*, and on 32 bit ABI, m_pad is added so that
541      --  this field takes 64 bits. On 64 bit ABI, m_pad is gone, and m_ptr is
542      --  a 64 bit void*. Assume int'Size = 32.
543
544      m_int2   : int_array (0 .. 1);
545      m_int3   : int_array (0 .. 3);
546      m_short2 : short_array (0 .. 1);
547      m_int4   : int_array (0 .. 4);
548      m_int5   : int_array (0 .. 1);
549   end record;
550   for pthread_mutex_t'Alignment use System.Address'Alignment;
551   pragma Convention (C, pthread_mutex_t);
552
553   type pthread_cond_t is record
554      c_short : short_array (0 .. 1);
555      c_int   : int;
556      c_int1  : int_array (0 .. 3);
557      m_pad   : int;
558      m_ptr   : int;  --  see comment in pthread_mutex_t
559      c_int2  : int_array (0 .. 1);
560      c_int3  : int_array (0 .. 1);
561      c_int4  : int_array (0 .. 1);
562   end record;
563   for pthread_cond_t'Alignment use System.Address'Alignment;
564   pragma Convention (C, pthread_cond_t);
565
566   type pthread_key_t is new int;
567
568end System.OS_Interface;
569