gcc/ada/s-osinte-aix.ads

   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) 1991-1994, 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 a AIX (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
  41 with Ada.Unchecked_Conversion;
  42
  43 with Interfaces.C;
  44
  45 package System.OS_Interface is
  46    pragma Preelaborate;
  47
  48    pragma Linker_Options ("-pthread");
  49    --  This implies -lpthreads + other things depending on the GCC
  50    --  configuration, such as the selection of a proper libgcc variant
  51    --  for table-based exception handling when it is available.
  52
  53    pragma Linker_Options ("-lc_r");
  54
  55    subtype int            is Interfaces.C.int;
  56    subtype short          is Interfaces.C.short;
  57    subtype long           is Interfaces.C.long;
  58    subtype unsigned       is Interfaces.C.unsigned;
  59    subtype unsigned_short is Interfaces.C.unsigned_short;
  60    subtype unsigned_long  is Interfaces.C.unsigned_long;
  61    subtype unsigned_char  is Interfaces.C.unsigned_char;
  62    subtype plain_char     is Interfaces.C.plain_char;
  63    subtype size_t         is Interfaces.C.size_t;
  64
  65    -----------
  66    -- Errno --
  67    -----------
  68
  69    function errno return int;
  70    pragma Import (C, errno, "__get_errno");
  71
  72    EAGAIN    : constant := 11;
  73    EINTR     : constant := 4;
  74    EINVAL    : constant := 22;
  75    ENOMEM    : constant := 12;
  76    ETIMEDOUT : constant := 78;
  77
  78    -------------
  79    -- Signals --
  80    -------------
  81
  82    Max_Interrupt : constant := 63;
  83    type Signal is new int range 0 .. Max_Interrupt;
  84    for Signal'Size use int'Size;
  85
  86    SIGHUP      : constant := 1; --  hangup
  87    SIGINT      : constant := 2; --  interrupt (rubout)
  88    SIGQUIT     : constant := 3; --  quit (ASCD FS)
  89    SIGILL      : constant := 4; --  illegal instruction (not reset)
  90    SIGTRAP     : constant := 5; --  trace trap (not reset)
  91    SIGIOT      : constant := 6; --  IOT instruction
  92    SIGABRT     : constant := 6; --  used by abort, replace SIGIOT in the future
  93    SIGEMT      : constant := 7; --  EMT instruction
  94    SIGFPE      : constant := 8; --  floating point exception
  95    SIGKILL     : constant := 9; --  kill (cannot be caught or ignored)
  96    SIGBUS      : constant := 10; --  bus error
  97    SIGSEGV     : constant := 11; --  segmentation violation
  98    SIGSYS      : constant := 12; --  bad argument to system call
  99    SIGPIPE     : constant := 13; --  write on a pipe with no one to read it
 100    SIGALRM     : constant := 14; --  alarm clock
 101    SIGTERM     : constant := 15; --  software termination signal from kill
 102    SIGUSR1     : constant := 30; --  user defined signal 1
 103    SIGUSR2     : constant := 31; --  user defined signal 2
 104    SIGCLD      : constant := 20; --  alias for SIGCHLD
 105    SIGCHLD     : constant := 20; --  child status change
 106    SIGPWR      : constant := 29; --  power-fail restart
 107    SIGWINCH    : constant := 28; --  window size change
 108    SIGURG      : constant := 16; --  urgent condition on IO channel
 109    SIGPOLL     : constant := 23; --  pollable event occurred
 110    SIGIO       : constant := 23; --  I/O possible (Solaris SIGPOLL alias)
 111    SIGSTOP     : constant := 17; --  stop (cannot be caught or ignored)
 112    SIGTSTP     : constant := 18; --  user stop requested from tty
 113    SIGCONT     : constant := 19; --  stopped process has been continued
 114    SIGTTIN     : constant := 21; --  background tty read attempted
 115    SIGTTOU     : constant := 22; --  background tty write attempted
 116    SIGVTALRM   : constant := 34; --  virtual timer expired
 117    SIGPROF     : constant := 32; --  profiling timer expired
 118    SIGXCPU     : constant := 24; --  CPU time limit exceeded
 119    SIGXFSZ     : constant := 25; --  filesize limit exceeded
 120    SIGWAITING  : constant := 39; --  m:n scheduling
 121
 122    --  The following signals are AIX specific
 123
 124    SIGMSG      : constant := 27; -- input data is in the ring buffer
 125    SIGDANGER   : constant := 33; -- system crash imminent
 126    SIGMIGRATE  : constant := 35; -- migrate process
 127    SIGPRE      : constant := 36; -- programming exception
 128    SIGVIRT     : constant := 37; -- AIX virtual time alarm
 129    SIGALRM1    : constant := 38; -- m:n condition variables
 130    SIGCPUFAIL  : constant := 59; -- Predictive De-configuration of Processors
 131    SIGKAP      : constant := 60; -- keep alive poll from native keyboard
 132    SIGGRANT    : constant := SIGKAP; -- monitor mode granted
 133    SIGRETRACT  : constant := 61; -- monitor mode should be relinquished
 134    SIGSOUND    : constant := 62; -- sound control has completed
 135    SIGSAK      : constant := 63; -- secure attention key
 136
 137    SIGADAABORT : constant := SIGEMT;
 138    --  Note: on other targets, we usually use SIGABRT, but on AIX, it appears
 139    --  that SIGABRT can't be used in sigwait(), so we use SIGEMT.
 140    --  SIGEMT is "Emulator Trap Instruction" from the PDP-11, and does not
 141    --  have a standardized usage.
 142
 143    type Signal_Set is array (Natural range <>) of Signal;
 144
 145    Unmasked : constant Signal_Set :=
 146                 (SIGTRAP, SIGTTIN, SIGTTOU, SIGTSTP, SIGPROF);
 147    Reserved : constant Signal_Set :=
 148                 (SIGABRT, SIGKILL, SIGSTOP, SIGALRM1, SIGWAITING, SIGCPUFAIL);
 149
 150    type sigset_t is private;
 151
 152    function sigaddset (set : access sigset_t; sig : Signal) return int;
 153    pragma Import (C, sigaddset, "sigaddset");
 154
 155    function sigdelset (set : access sigset_t; sig : Signal) return int;
 156    pragma Import (C, sigdelset, "sigdelset");
 157
 158    function sigfillset (set : access sigset_t) return int;
 159    pragma Import (C, sigfillset, "sigfillset");
 160
 161    function sigismember (set : access sigset_t; sig : Signal) return int;
 162    pragma Import (C, sigismember, "sigismember");
 163
 164    function sigemptyset (set : access sigset_t) return int;
 165    pragma Import (C, sigemptyset, "sigemptyset");
 166
 167    type struct_sigaction is record
 168       sa_handler : System.Address;
 169       sa_mask    : sigset_t;
 170       sa_flags   : int;
 171    end record;
 172    pragma Convention (C, struct_sigaction);
 173    type struct_sigaction_ptr is access all struct_sigaction;
 174
 175    SA_SIGINFO : constant := 16#0100#;
 176    SA_ONSTACK : constant := 16#0001#;
 177
 178    SIG_BLOCK   : constant := 0;
 179    SIG_UNBLOCK : constant := 1;
 180    SIG_SETMASK : constant := 2;
 181
 182    SIG_DFL : constant := 0;
 183    SIG_IGN : constant := 1;
 184
 185    function sigaction
 186      (sig  : Signal;
 187       act  : struct_sigaction_ptr;
 188       oact : struct_sigaction_ptr) return int;
 189    pragma Import (C, sigaction, "sigaction");
 190
 191    ----------
 192    -- Time --
 193    ----------
 194
 195    Time_Slice_Supported : constant Boolean := True;
 196    --  Indicates whether time slicing is supported
 197
 198    type timespec is private;
 199
 200    type clockid_t is new int;
 201
 202    function clock_gettime
 203      (clock_id : clockid_t;
 204       tp       : access timespec) return int;
 205
 206    function To_Duration (TS : timespec) return Duration;
 207    pragma Inline (To_Duration);
 208
 209    function To_Timespec (D : Duration) return timespec;
 210    pragma Inline (To_Timespec);
 211
 212    type struct_timezone is record
 213       tz_minuteswest : int;
 214       tz_dsttime     : int;
 215    end record;
 216    pragma Convention (C, struct_timezone);
 217    type struct_timezone_ptr is access all struct_timezone;
 218
 219    -------------------------
 220    -- Priority Scheduling --
 221    -------------------------
 222
 223    SCHED_FIFO  : constant := 1;
 224    SCHED_RR    : constant := 2;
 225    SCHED_OTHER : constant := 0;
 226
 227    function To_Target_Priority
 228      (Prio : System.Any_Priority) return Interfaces.C.int;
 229    --  Maps System.Any_Priority to a POSIX priority
 230
 231    -------------
 232    -- Process --
 233    -------------
 234
 235    type pid_t is private;
 236
 237    function kill (pid : pid_t; sig : Signal) return int;
 238    pragma Import (C, kill, "kill");
 239
 240    function getpid return pid_t;
 241    pragma Import (C, getpid, "getpid");
 242
 243    ---------
 244    -- LWP --
 245    ---------
 246
 247    function lwp_self return System.Address;
 248    pragma Import (C, lwp_self, "thread_self");
 249
 250    -------------
 251    -- Threads --
 252    -------------
 253
 254    type Thread_Body is access
 255      function (arg : System.Address) return System.Address;
 256    pragma Convention (C, Thread_Body);
 257
 258    function Thread_Body_Access is new
 259      Ada.Unchecked_Conversion (System.Address, Thread_Body);
 260
 261    type pthread_t           is private;
 262    subtype Thread_Id        is pthread_t;
 263
 264    type pthread_mutex_t     is limited private;
 265    type pthread_cond_t      is limited private;
 266    type pthread_attr_t      is limited private;
 267    type pthread_mutexattr_t is limited private;
 268    type pthread_condattr_t  is limited private;
 269    type pthread_key_t       is private;
 270
 271    PTHREAD_CREATE_DETACHED : constant := 1;
 272
 273    PTHREAD_SCOPE_PROCESS : constant := 1;
 274    PTHREAD_SCOPE_SYSTEM  : constant := 0;
 275
 276    --  Read/Write lock not supported on AIX. To add support both types
 277    --  pthread_rwlock_t and pthread_rwlockattr_t must properly be defined
 278    --  with the associated routines pthread_rwlock_[init/destroy] and
 279    --  pthread_rwlock_[rdlock/wrlock/unlock].
 280
 281    subtype pthread_rwlock_t     is pthread_mutex_t;
 282    subtype pthread_rwlockattr_t is pthread_mutexattr_t;
 283
 284    -----------
 285    -- Stack --
 286    -----------
 287
 288    type stack_t is record
 289       ss_sp    : System.Address;
 290       ss_size  : size_t;
 291       ss_flags : int;
 292    end record;
 293    pragma Convention (C, stack_t);
 294
 295    function sigaltstack
 296      (ss  : not null access stack_t;
 297       oss : access stack_t) return int;
 298    pragma Import (C, sigaltstack, "sigaltstack");
 299
 300    Alternate_Stack : aliased System.Address;
 301    --  This is a dummy definition, never used (Alternate_Stack_Size is null)
 302
 303    Alternate_Stack_Size : constant := 0;
 304    --  No alternate signal stack is used on this platform
 305
 306    Stack_Base_Available : constant Boolean := False;
 307    --  Indicates whether the stack base is available on this target
 308
 309    function Get_Stack_Base (thread : pthread_t) return Address;
 310    pragma Inline (Get_Stack_Base);
 311    --  Returns the stack base of the specified thread. Only call this function
 312    --  when Stack_Base_Available is True.
 313
 314    function Get_Page_Size return size_t;
 315    function Get_Page_Size return Address;
 316    pragma Import (C, Get_Page_Size, "getpagesize");
 317    --  Returns the size of a page
 318
 319    PROT_NONE  : constant := 0;
 320    PROT_READ  : constant := 1;
 321    PROT_WRITE : constant := 2;
 322    PROT_EXEC  : constant := 4;
 323    PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
 324    PROT_ON    : constant := PROT_READ;
 325    PROT_OFF   : constant := PROT_ALL;
 326
 327    function mprotect (addr : Address; len : size_t; prot : int) return int;
 328    pragma Import (C, mprotect);
 329
 330    ---------------------------------------
 331    -- Nonstandard Thread Initialization --
 332    ---------------------------------------
 333
 334    --  Though not documented, pthread_init *must* be called before any other
 335    --  pthread call.
 336
 337    procedure pthread_init;
 338    pragma Import (C, pthread_init, "pthread_init");
 339
 340    -------------------------
 341    -- POSIX.1c  Section 3 --
 342    -------------------------
 343
 344    function sigwait
 345      (set : access sigset_t;
 346       sig : access Signal) return int;
 347    pragma Import (C, sigwait, "sigwait");
 348
 349    function pthread_kill
 350      (thread : pthread_t;
 351       sig    : Signal) return int;
 352    pragma Import (C, pthread_kill, "pthread_kill");
 353
 354    function pthread_sigmask
 355      (how  : int;
 356       set  : access sigset_t;
 357       oset : access sigset_t) return int;
 358    pragma Import (C, pthread_sigmask, "sigthreadmask");
 359
 360    --------------------------
 361    -- POSIX.1c  Section 11 --
 362    --------------------------
 363
 364    function pthread_mutexattr_init
 365      (attr : access pthread_mutexattr_t) return int;
 366    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 367
 368    function pthread_mutexattr_destroy
 369      (attr : access pthread_mutexattr_t) return int;
 370    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 371
 372    function pthread_mutex_init
 373      (mutex : access pthread_mutex_t;
 374       attr  : access pthread_mutexattr_t) return int;
 375    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 376
 377    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 378    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 379
 380    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 381    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 382
 383    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 384    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 385
 386    function pthread_condattr_init
 387      (attr : access pthread_condattr_t) return int;
 388    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 389
 390    function pthread_condattr_destroy
 391      (attr : access pthread_condattr_t) return int;
 392    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 393
 394    function pthread_cond_init
 395      (cond : access pthread_cond_t;
 396       attr : access pthread_condattr_t) return int;
 397    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 398
 399    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 400    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 401
 402    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 403    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 404
 405    function pthread_cond_wait
 406      (cond  : access pthread_cond_t;
 407       mutex : access pthread_mutex_t) return int;
 408    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 409
 410    function pthread_cond_timedwait
 411      (cond    : access pthread_cond_t;
 412       mutex   : access pthread_mutex_t;
 413       abstime : access timespec) return int;
 414    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 415
 416    Relative_Timed_Wait : constant Boolean := False;
 417    --  pthread_cond_timedwait requires an absolute delay time
 418
 419    --------------------------
 420    -- POSIX.1c  Section 13 --
 421    --------------------------
 422
 423    PTHREAD_PRIO_PROTECT : constant := 2;
 424
 425    function PTHREAD_PRIO_INHERIT return int;
 426    --  Return value of C macro PTHREAD_PRIO_INHERIT. This function is needed
 427    --  since the value is different between AIX versions.
 428
 429    function pthread_mutexattr_setprotocol
 430      (attr     : access pthread_mutexattr_t;
 431       protocol : int) return int;
 432    pragma Import (C, pthread_mutexattr_setprotocol);
 433
 434    function pthread_mutexattr_setprioceiling
 435      (attr        : access pthread_mutexattr_t;
 436       prioceiling : int) return int;
 437    pragma Import (C, pthread_mutexattr_setprioceiling);
 438
 439    type Array_5_Int is array (0 .. 5) of int;
 440    type struct_sched_param is record
 441       sched_priority : int;
 442       sched_policy   : int;
 443       sched_reserved : Array_5_Int;
 444    end record;
 445
 446    function pthread_setschedparam
 447      (thread : pthread_t;
 448       policy : int;
 449       param  : access struct_sched_param) return int;
 450    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 451
 452    function pthread_attr_setscope
 453      (attr            : access pthread_attr_t;
 454       contentionscope : int) return int;
 455    pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
 456
 457    function pthread_attr_setinheritsched
 458      (attr            : access pthread_attr_t;
 459       inheritsched : int) return int;
 460    pragma Import (C, pthread_attr_setinheritsched);
 461
 462    function pthread_attr_setschedpolicy
 463      (attr   : access pthread_attr_t;
 464       policy : int) return int;
 465    pragma Import (C, pthread_attr_setschedpolicy);
 466
 467    function pthread_attr_setschedparam
 468      (attr        : access pthread_attr_t;
 469       sched_param : int) return int;
 470    pragma Import (C, pthread_attr_setschedparam);
 471
 472    function sched_yield return int;
 473    --  AIX have a nonstandard sched_yield
 474
 475    --------------------------
 476    -- P1003.1c  Section 16 --
 477    --------------------------
 478
 479    function pthread_attr_init (attributes : access pthread_attr_t) return int;
 480    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 481
 482    function pthread_attr_destroy
 483      (attributes : access pthread_attr_t) return int;
 484    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 485
 486    function pthread_attr_setdetachstate
 487      (attr        : access pthread_attr_t;
 488       detachstate : int) return int;
 489    pragma Import (C, pthread_attr_setdetachstate);
 490
 491    function pthread_attr_setstacksize
 492      (attr      : access pthread_attr_t;
 493       stacksize : size_t) return int;
 494    pragma Import (C, pthread_attr_setstacksize);
 495
 496    function pthread_create
 497      (thread        : access pthread_t;
 498       attributes    : access pthread_attr_t;
 499       start_routine : Thread_Body;
 500       arg           : System.Address)
 501      return int;
 502    pragma Import (C, pthread_create, "pthread_create");
 503
 504    procedure pthread_exit (status : System.Address);
 505    pragma Import (C, pthread_exit, "pthread_exit");
 506
 507    function pthread_self return pthread_t;
 508    pragma Import (C, pthread_self, "pthread_self");
 509
 510    --------------------------
 511    -- POSIX.1c  Section 17 --
 512    --------------------------
 513
 514    function pthread_setspecific
 515      (key   : pthread_key_t;
 516       value : System.Address) return int;
 517    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 518
 519    function pthread_getspecific (key : pthread_key_t) return System.Address;
 520    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 521
 522    type destructor_pointer is access procedure (arg : System.Address);
 523    pragma Convention (C, destructor_pointer);
 524
 525    function pthread_key_create
 526      (key        : access pthread_key_t;
 527       destructor : destructor_pointer) return int;
 528    pragma Import (C, pthread_key_create, "pthread_key_create");
 529
 530 private
 531    type sigset_t is record
 532       losigs : unsigned_long;
 533       hisigs : unsigned_long;
 534    end record;
 535    pragma Convention (C_Pass_By_Copy, sigset_t);
 536
 537    type pid_t is new int;
 538
 539    type time_t is new long;
 540
 541    type timespec is record
 542       tv_sec  : time_t;
 543       tv_nsec : long;
 544    end record;
 545    pragma Convention (C, timespec);
 546
 547    type pthread_attr_t is new System.Address;
 548    pragma Convention (C, pthread_attr_t);
 549    --  typedef struct __pt_attr        *pthread_attr_t;
 550
 551    type pthread_condattr_t is new System.Address;
 552    pragma Convention (C, pthread_condattr_t);
 553    --  typedef struct __pt_attr        *pthread_condattr_t;
 554
 555    type pthread_mutexattr_t is new System.Address;
 556    pragma Convention (C, pthread_mutexattr_t);
 557    --  typedef struct __pt_attr        *pthread_mutexattr_t;
 558
 559    type pthread_t is new System.Address;
 560    pragma Convention (C, pthread_t);
 561    --  typedef void    *pthread_t;
 562
 563    type ptq_queue;
 564    type ptq_queue_ptr is access all ptq_queue;
 565
 566    type ptq_queue is record
 567       ptq_next : ptq_queue_ptr;
 568       ptq_prev : ptq_queue_ptr;
 569    end record;
 570
 571    type Array_3_Int is array (0 .. 3) of int;
 572    type pthread_mutex_t is record
 573         link        : ptq_queue;
 574         ptmtx_lock  : int;
 575         ptmtx_flags : long;
 576         protocol    : int;
 577         prioceiling : int;
 578         ptmtx_owner : pthread_t;
 579         mtx_id      : int;
 580         attr        : pthread_attr_t;
 581         mtx_kind    : int;
 582         lock_cpt    : int;
 583         reserved    : Array_3_Int;
 584    end record;
 585    pragma Convention (C, pthread_mutex_t);
 586    type pthread_mutex_t_ptr is access pthread_mutex_t;
 587
 588    type pthread_cond_t is record
 589       link         : ptq_queue;
 590       ptcv_lock    : int;
 591       ptcv_flags   : long;
 592       ptcv_waiters : ptq_queue;
 593       cv_id        : int;
 594       attr         : pthread_attr_t;
 595       mutex        : pthread_mutex_t_ptr;
 596       cptwait      : int;
 597       reserved     : int;
 598    end record;
 599    pragma Convention (C, pthread_cond_t);
 600
 601    type pthread_key_t is new unsigned;
 602
 603 end System.OS_Interface;