gcc/ada/s-osinte-linux.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) 1995-2015, 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 GNU/Linux (GNU/LinuxThreads) version of this package
  34
  35 --  This package encapsulates all direct interfaces to OS services
  36 --  that are 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 with Interfaces.C;
  43 with System.Linux;
  44 with System.OS_Constants;
  45
  46 package System.OS_Interface is
  47    pragma Preelaborate;
  48
  49    pragma Linker_Options ("-lpthread");
  50    pragma Linker_Options ("-lrt");
  51    --  Needed for clock_getres with glibc versions prior to 2.17
  52
  53    subtype int            is Interfaces.C.int;
  54    subtype char           is Interfaces.C.char;
  55    subtype short          is Interfaces.C.short;
  56    subtype long           is Interfaces.C.long;
  57    subtype unsigned       is Interfaces.C.unsigned;
  58    subtype unsigned_short is Interfaces.C.unsigned_short;
  59    subtype unsigned_long  is Interfaces.C.unsigned_long;
  60    subtype unsigned_char  is Interfaces.C.unsigned_char;
  61    subtype plain_char     is Interfaces.C.plain_char;
  62    subtype size_t         is Interfaces.C.size_t;
  63
  64    -----------
  65    -- Errno --
  66    -----------
  67
  68    function errno return int;
  69    pragma Import (C, errno, "__get_errno");
  70
  71    EAGAIN    : constant := System.Linux.EAGAIN;
  72    EINTR     : constant := System.Linux.EINTR;
  73    EINVAL    : constant := System.Linux.EINVAL;
  74    ENOMEM    : constant := System.Linux.ENOMEM;
  75    EPERM     : constant := System.Linux.EPERM;
  76    ETIMEDOUT : constant := System.Linux.ETIMEDOUT;
  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 := System.Linux.SIGHUP;
  87    SIGINT     : constant := System.Linux.SIGINT;
  88    SIGQUIT    : constant := System.Linux.SIGQUIT;
  89    SIGILL     : constant := System.Linux.SIGILL;
  90    SIGTRAP    : constant := System.Linux.SIGTRAP;
  91    SIGIOT     : constant := System.Linux.SIGIOT;
  92    SIGABRT    : constant := System.Linux.SIGABRT;
  93    SIGFPE     : constant := System.Linux.SIGFPE;
  94    SIGKILL    : constant := System.Linux.SIGKILL;
  95    SIGBUS     : constant := System.Linux.SIGBUS;
  96    SIGSEGV    : constant := System.Linux.SIGSEGV;
  97    SIGPIPE    : constant := System.Linux.SIGPIPE;
  98    SIGALRM    : constant := System.Linux.SIGALRM;
  99    SIGTERM    : constant := System.Linux.SIGTERM;
 100    SIGUSR1    : constant := System.Linux.SIGUSR1;
 101    SIGUSR2    : constant := System.Linux.SIGUSR2;
 102    SIGCLD     : constant := System.Linux.SIGCLD;
 103    SIGCHLD    : constant := System.Linux.SIGCHLD;
 104    SIGPWR     : constant := System.Linux.SIGPWR;
 105    SIGWINCH   : constant := System.Linux.SIGWINCH;
 106    SIGURG     : constant := System.Linux.SIGURG;
 107    SIGPOLL    : constant := System.Linux.SIGPOLL;
 108    SIGIO      : constant := System.Linux.SIGIO;
 109    SIGLOST    : constant := System.Linux.SIGLOST;
 110    SIGSTOP    : constant := System.Linux.SIGSTOP;
 111    SIGTSTP    : constant := System.Linux.SIGTSTP;
 112    SIGCONT    : constant := System.Linux.SIGCONT;
 113    SIGTTIN    : constant := System.Linux.SIGTTIN;
 114    SIGTTOU    : constant := System.Linux.SIGTTOU;
 115    SIGVTALRM  : constant := System.Linux.SIGVTALRM;
 116    SIGPROF    : constant := System.Linux.SIGPROF;
 117    SIGXCPU    : constant := System.Linux.SIGXCPU;
 118    SIGXFSZ    : constant := System.Linux.SIGXFSZ;
 119    SIGUNUSED  : constant := System.Linux.SIGUNUSED;
 120    SIGSTKFLT  : constant := System.Linux.SIGSTKFLT;
 121    SIGLTHRRES : constant := System.Linux.SIGLTHRRES;
 122    SIGLTHRCAN : constant := System.Linux.SIGLTHRCAN;
 123    SIGLTHRDBG : constant := System.Linux.SIGLTHRDBG;
 124
 125    SIGADAABORT : constant := SIGABRT;
 126    --  Change this to use another signal for task abort. SIGTERM might be a
 127    --  good one.
 128
 129    type Signal_Set is array (Natural range <>) of Signal;
 130
 131    Unmasked : constant Signal_Set := (
 132       SIGTRAP,
 133       --  To enable debugging on multithreaded applications, mark SIGTRAP to
 134       --  be kept unmasked.
 135
 136       SIGBUS,
 137
 138       SIGTTIN, SIGTTOU, SIGTSTP,
 139       --  Keep these three signals unmasked so that background processes and IO
 140       --  behaves as normal "C" applications
 141
 142       SIGPROF,
 143       --  To avoid confusing the profiler
 144
 145       SIGKILL, SIGSTOP,
 146       --  These two signals actually can't be masked (POSIX won't allow it)
 147
 148       SIGLTHRRES, SIGLTHRCAN, SIGLTHRDBG);
 149       --  These three signals are used by GNU/LinuxThreads starting from glibc
 150       --  2.1 (future 2.2).
 151
 152    Reserved : constant Signal_Set := (SIGVTALRM, SIGUNUSED);
 153    --  Not clear why these two signals are reserved. Perhaps they are not
 154    --  supported by this version of GNU/Linux ???
 155
 156    type sigset_t is private;
 157
 158    function sigaddset (set : access sigset_t; sig : Signal) return int;
 159    pragma Import (C, sigaddset, "sigaddset");
 160
 161    function sigdelset (set : access sigset_t; sig : Signal) return int;
 162    pragma Import (C, sigdelset, "sigdelset");
 163
 164    function sigfillset (set : access sigset_t) return int;
 165    pragma Import (C, sigfillset, "sigfillset");
 166
 167    function sigismember (set : access sigset_t; sig : Signal) return int;
 168    pragma Import (C, sigismember, "sigismember");
 169
 170    function sigemptyset (set : access sigset_t) return int;
 171    pragma Import (C, sigemptyset, "sigemptyset");
 172
 173    type union_type_3 is new String (1 .. 116);
 174    type siginfo_t is record
 175       si_signo : int;
 176       si_code  : int;
 177       si_errno : int;
 178       X_data   : union_type_3;
 179    end record;
 180    pragma Convention (C, siginfo_t);
 181
 182    type struct_sigaction is record
 183       sa_handler  : System.Address;
 184       sa_mask     : sigset_t;
 185       sa_flags    : Interfaces.C.unsigned_long;
 186       sa_restorer : System.Address;
 187    end record;
 188    pragma Convention (C, struct_sigaction);
 189
 190    type struct_sigaction_ptr is access all struct_sigaction;
 191
 192    type Machine_State is record
 193       eip : unsigned_long;
 194       ebx : unsigned_long;
 195       esp : unsigned_long;
 196       ebp : unsigned_long;
 197       esi : unsigned_long;
 198       edi : unsigned_long;
 199    end record;
 200    type Machine_State_Ptr is access all Machine_State;
 201
 202    SA_SIGINFO : constant := System.Linux.SA_SIGINFO;
 203    SA_ONSTACK : constant := System.Linux.SA_ONSTACK;
 204
 205    SIG_BLOCK   : constant := 0;
 206    SIG_UNBLOCK : constant := 1;
 207    SIG_SETMASK : constant := 2;
 208
 209    SIG_DFL : constant := 0;
 210    SIG_IGN : constant := 1;
 211
 212    function sigaction
 213      (sig  : Signal;
 214       act  : struct_sigaction_ptr;
 215       oact : struct_sigaction_ptr) return int;
 216    pragma Import (C, sigaction, "sigaction");
 217
 218    ----------
 219    -- Time --
 220    ----------
 221
 222    subtype time_t    is System.Linux.time_t;
 223    subtype timespec  is System.Linux.timespec;
 224    subtype timeval   is System.Linux.timeval;
 225    subtype clockid_t is System.Linux.clockid_t;
 226
 227    function clock_gettime
 228      (clock_id : clockid_t; tp : access timespec) return int;
 229    pragma Import (C, clock_gettime, "clock_gettime");
 230
 231    function clock_getres
 232      (clock_id : clockid_t;
 233       res      : access timespec) return int;
 234    pragma Import (C, clock_getres, "clock_getres");
 235
 236    function To_Duration (TS : timespec) return Duration;
 237    pragma Inline (To_Duration);
 238
 239    function To_Timespec (D : Duration) return timespec;
 240    pragma Inline (To_Timespec);
 241
 242    function sysconf (name : int) return long;
 243    pragma Import (C, sysconf);
 244
 245    SC_CLK_TCK          : constant := 2;
 246    SC_NPROCESSORS_ONLN : constant := 84;
 247
 248    -------------------------
 249    -- Priority Scheduling --
 250    -------------------------
 251
 252    SCHED_OTHER : constant := 0;
 253    SCHED_FIFO  : constant := 1;
 254    SCHED_RR    : constant := 2;
 255
 256    function To_Target_Priority
 257      (Prio : System.Any_Priority) return Interfaces.C.int;
 258    --  Maps System.Any_Priority to a POSIX priority
 259
 260    -------------
 261    -- Process --
 262    -------------
 263
 264    type pid_t is private;
 265
 266    function kill (pid : pid_t; sig : Signal) return int;
 267    pragma Import (C, kill, "kill");
 268
 269    function getpid return pid_t;
 270    pragma Import (C, getpid, "getpid");
 271
 272    PR_SET_NAME : constant := 15;
 273
 274    function prctl
 275      (option                 : int;
 276       arg2, arg3, arg4, arg5 : unsigned_long := 0) return int;
 277    pragma Import (C, prctl);
 278
 279    -------------
 280    -- Threads --
 281    -------------
 282
 283    type Thread_Body is access
 284      function (arg : System.Address) return System.Address;
 285    pragma Convention (C, Thread_Body);
 286
 287    function Thread_Body_Access is new
 288      Ada.Unchecked_Conversion (System.Address, Thread_Body);
 289
 290    type pthread_t is new unsigned_long;
 291    subtype Thread_Id is pthread_t;
 292
 293    function To_pthread_t is
 294      new Ada.Unchecked_Conversion (unsigned_long, pthread_t);
 295
 296    type pthread_mutex_t      is limited private;
 297    type pthread_rwlock_t     is limited private;
 298    type pthread_cond_t       is limited private;
 299    type pthread_attr_t       is limited private;
 300    type pthread_mutexattr_t  is limited private;
 301    type pthread_rwlockattr_t is limited private;
 302    type pthread_condattr_t   is limited private;
 303    type pthread_key_t        is private;
 304
 305    PTHREAD_CREATE_DETACHED : constant := 1;
 306
 307    -----------
 308    -- Stack --
 309    -----------
 310
 311    type stack_t is record
 312       ss_sp    : System.Address;
 313       ss_flags : int;
 314       ss_size  : size_t;
 315    end record;
 316    pragma Convention (C, stack_t);
 317
 318    function sigaltstack
 319      (ss  : not null access stack_t;
 320       oss : access stack_t) return int;
 321    pragma Import (C, sigaltstack, "sigaltstack");
 322
 323    Alternate_Stack : aliased System.Address;
 324    pragma Import (C, Alternate_Stack, "__gnat_alternate_stack");
 325    --  The alternate signal stack for stack overflows
 326
 327    Alternate_Stack_Size : constant := 16 * 1024;
 328    --  This must be in keeping with init.c:__gnat_alternate_stack
 329
 330    function Get_Stack_Base (thread : pthread_t) return Address;
 331    pragma Inline (Get_Stack_Base);
 332    --  This is a dummy procedure to share some GNULLI files
 333
 334    ---------------------------------------
 335    -- Nonstandard Thread Initialization --
 336    ---------------------------------------
 337
 338    procedure pthread_init;
 339    pragma Inline (pthread_init);
 340    --  This is a dummy procedure to share some GNULLI files
 341
 342    -------------------------
 343    -- POSIX.1c  Section 3 --
 344    -------------------------
 345
 346    function sigwait (set : access sigset_t; sig : access Signal) return int;
 347    pragma Import (C, sigwait, "sigwait");
 348
 349    function pthread_kill (thread : pthread_t; sig : Signal) return int;
 350    pragma Import (C, pthread_kill, "pthread_kill");
 351
 352    function pthread_sigmask
 353      (how  : int;
 354       set  : access sigset_t;
 355       oset : access sigset_t) return int;
 356    pragma Import (C, pthread_sigmask, "pthread_sigmask");
 357
 358    --------------------------
 359    -- POSIX.1c  Section 11 --
 360    --------------------------
 361
 362    function pthread_mutexattr_init
 363      (attr : access pthread_mutexattr_t) return int;
 364    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 365
 366    function pthread_mutexattr_destroy
 367      (attr : access pthread_mutexattr_t) return int;
 368    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 369
 370    function pthread_mutex_init
 371      (mutex : access pthread_mutex_t;
 372       attr  : access pthread_mutexattr_t) return int;
 373    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 374
 375    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 376    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 377
 378    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 379    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 380
 381    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 382    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 383
 384    function pthread_rwlockattr_init
 385      (attr : access pthread_rwlockattr_t) return int;
 386    pragma Import (C, pthread_rwlockattr_init, "pthread_rwlockattr_init");
 387
 388    function pthread_rwlockattr_destroy
 389      (attr : access pthread_rwlockattr_t) return int;
 390    pragma Import (C, pthread_rwlockattr_destroy, "pthread_rwlockattr_destroy");
 391
 392    PTHREAD_RWLOCK_PREFER_READER_NP              : constant := 0;
 393    PTHREAD_RWLOCK_PREFER_WRITER_NP              : constant := 1;
 394    PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP : constant := 2;
 395
 396    function pthread_rwlockattr_setkind_np
 397      (attr : access pthread_rwlockattr_t;
 398       pref : int) return int;
 399    pragma Import
 400      (C, pthread_rwlockattr_setkind_np, "pthread_rwlockattr_setkind_np");
 401
 402    function pthread_rwlock_init
 403      (mutex : access pthread_rwlock_t;
 404       attr  : access pthread_rwlockattr_t) return int;
 405    pragma Import (C, pthread_rwlock_init, "pthread_rwlock_init");
 406
 407    function pthread_rwlock_destroy
 408      (mutex : access pthread_rwlock_t) return int;
 409    pragma Import (C, pthread_rwlock_destroy, "pthread_rwlock_destroy");
 410
 411    function pthread_rwlock_rdlock (mutex : access pthread_rwlock_t) return int;
 412    pragma Import (C, pthread_rwlock_rdlock, "pthread_rwlock_rdlock");
 413
 414    function pthread_rwlock_wrlock (mutex : access pthread_rwlock_t) return int;
 415    pragma Import (C, pthread_rwlock_wrlock, "pthread_rwlock_wrlock");
 416
 417    function pthread_rwlock_unlock (mutex : access pthread_rwlock_t) return int;
 418    pragma Import (C, pthread_rwlock_unlock, "pthread_rwlock_unlock");
 419
 420    function pthread_condattr_init
 421      (attr : access pthread_condattr_t) return int;
 422    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 423
 424    function pthread_condattr_destroy
 425      (attr : access pthread_condattr_t) return int;
 426    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 427
 428    function pthread_cond_init
 429      (cond : access pthread_cond_t;
 430       attr : access pthread_condattr_t) return int;
 431    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 432
 433    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 434    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 435
 436    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 437    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 438
 439    function pthread_cond_wait
 440      (cond  : access pthread_cond_t;
 441       mutex : access pthread_mutex_t) return int;
 442    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 443
 444    function pthread_cond_timedwait
 445      (cond    : access pthread_cond_t;
 446       mutex   : access pthread_mutex_t;
 447       abstime : access timespec) return int;
 448    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 449
 450    --------------------------
 451    -- POSIX.1c  Section 13 --
 452    --------------------------
 453
 454    type struct_sched_param is record
 455       sched_priority : int;  --  scheduling priority
 456    end record;
 457    pragma Convention (C, struct_sched_param);
 458
 459    function pthread_setschedparam
 460      (thread : pthread_t;
 461       policy : int;
 462       param  : access struct_sched_param) return int;
 463    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 464
 465    function pthread_attr_setschedpolicy
 466      (attr   : access pthread_attr_t;
 467       policy : int) return int;
 468    pragma Import
 469      (C, pthread_attr_setschedpolicy, "pthread_attr_setschedpolicy");
 470
 471    function sched_yield return int;
 472    pragma Import (C, sched_yield, "sched_yield");
 473
 474    ---------------------------
 475    -- P1003.1c - Section 16 --
 476    ---------------------------
 477
 478    function pthread_attr_init
 479      (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
 490      (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
 491
 492    function pthread_attr_setstacksize
 493      (attr      : access pthread_attr_t;
 494       stacksize : size_t) return int;
 495    pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
 496
 497    function pthread_create
 498      (thread        : access pthread_t;
 499       attributes    : access pthread_attr_t;
 500       start_routine : Thread_Body;
 501       arg           : System.Address) 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    function lwp_self return System.Address;
 511    pragma Import (C, lwp_self, "__gnat_lwp_self");
 512
 513    --------------------------
 514    -- POSIX.1c  Section 17 --
 515    --------------------------
 516
 517    function pthread_setspecific
 518      (key   : pthread_key_t;
 519       value : System.Address) return int;
 520    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 521
 522    function pthread_getspecific (key : pthread_key_t) return System.Address;
 523    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 524
 525    type destructor_pointer is access procedure (arg : System.Address);
 526    pragma Convention (C, destructor_pointer);
 527
 528    function pthread_key_create
 529      (key        : access pthread_key_t;
 530       destructor : destructor_pointer) return int;
 531    pragma Import (C, pthread_key_create, "pthread_key_create");
 532
 533    ----------------
 534    -- Extensions --
 535    ----------------
 536
 537    CPU_SETSIZE : constant := 1_024;
 538    --  Size of the cpu_set_t mask on most linux systems (SUSE 11 uses 4_096).
 539    --  This is kept for backward compatibility (System.Task_Info uses it), but
 540    --  the run-time library does no longer rely on static masks, using
 541    --  dynamically allocated masks instead.
 542
 543    type bit_field is array (1 .. CPU_SETSIZE) of Boolean;
 544    for bit_field'Size use CPU_SETSIZE;
 545    pragma Pack (bit_field);
 546    pragma Convention (C, bit_field);
 547
 548    type cpu_set_t is record
 549       bits : bit_field;
 550    end record;
 551    pragma Convention (C, cpu_set_t);
 552
 553    type cpu_set_t_ptr is access all cpu_set_t;
 554    --  In the run-time library we use this pointer because the size of type
 555    --  cpu_set_t varies depending on the glibc version. Hence, objects of type
 556    --  cpu_set_t are allocated dynamically using the number of processors
 557    --  available in the target machine (value obtained at execution time).
 558
 559    function CPU_ALLOC (count : size_t) return cpu_set_t_ptr;
 560    pragma Import (C, CPU_ALLOC, "__gnat_cpu_alloc");
 561    --  Wrapper around the CPU_ALLOC C macro
 562
 563    function CPU_ALLOC_SIZE (count : size_t) return size_t;
 564    pragma Import (C, CPU_ALLOC_SIZE, "__gnat_cpu_alloc_size");
 565    --  Wrapper around the CPU_ALLOC_SIZE C macro
 566
 567    procedure CPU_FREE (cpuset : cpu_set_t_ptr);
 568    pragma Import (C, CPU_FREE, "__gnat_cpu_free");
 569    --  Wrapper around the CPU_FREE C macro
 570
 571    procedure CPU_ZERO (count : size_t; cpuset : cpu_set_t_ptr);
 572    pragma Import (C, CPU_ZERO, "__gnat_cpu_zero");
 573    --  Wrapper around the CPU_ZERO_S C macro
 574
 575    procedure CPU_SET (cpu : int; count : size_t; cpuset : cpu_set_t_ptr);
 576    pragma Import (C, CPU_SET, "__gnat_cpu_set");
 577    --  Wrapper around the CPU_SET_S C macro
 578
 579    function pthread_setaffinity_np
 580      (thread     : pthread_t;
 581       cpusetsize : size_t;
 582       cpuset     : cpu_set_t_ptr) return int;
 583    pragma Import (C, pthread_setaffinity_np, "pthread_setaffinity_np");
 584    pragma Weak_External (pthread_setaffinity_np);
 585    --  Use a weak symbol because this function may be available or not,
 586    --  depending on the version of the system.
 587
 588    function pthread_attr_setaffinity_np
 589      (attr       : access pthread_attr_t;
 590       cpusetsize : size_t;
 591       cpuset     : cpu_set_t_ptr) return int;
 592    pragma Import (C, pthread_attr_setaffinity_np,
 593                     "pthread_attr_setaffinity_np");
 594    pragma Weak_External (pthread_attr_setaffinity_np);
 595    --  Use a weak symbol because this function may be available or not,
 596    --  depending on the version of the system.
 597
 598 private
 599
 600    type sigset_t is
 601      array (0 .. OS_Constants.SIZEOF_sigset - 1) of unsigned_char;
 602    pragma Convention (C, sigset_t);
 603    for sigset_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 604
 605    pragma Warnings (Off);
 606    for struct_sigaction use record
 607       sa_handler at Linux.sa_handler_pos range 0 .. Standard'Address_Size - 1;
 608       sa_mask    at Linux.sa_mask_pos    range 0 .. 1023;
 609       sa_flags   at Linux.sa_flags_pos
 610         range 0 .. Interfaces.C.unsigned_long'Size - 1;
 611    end record;
 612    --  We intentionally leave sa_restorer unspecified and let the compiler
 613    --  append it after the last field, so disable corresponding warning.
 614    pragma Warnings (On);
 615
 616    type pid_t is new int;
 617
 618    subtype char_array is Interfaces.C.char_array;
 619
 620    type pthread_attr_t is record
 621       Data : char_array (1 .. OS_Constants.PTHREAD_ATTR_SIZE);
 622    end record;
 623    pragma Convention (C, pthread_attr_t);
 624    for pthread_attr_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 625
 626    type pthread_condattr_t is record
 627       Data : char_array (1 .. OS_Constants.PTHREAD_CONDATTR_SIZE);
 628    end record;
 629    pragma Convention (C, pthread_condattr_t);
 630    for pthread_condattr_t'Alignment use Interfaces.C.int'Alignment;
 631
 632    type pthread_mutexattr_t is record
 633       Data : char_array (1 .. OS_Constants.PTHREAD_MUTEXATTR_SIZE);
 634    end  record;
 635    pragma Convention (C, pthread_mutexattr_t);
 636    for pthread_mutexattr_t'Alignment use Interfaces.C.int'Alignment;
 637
 638    type pthread_mutex_t is record
 639       Data : char_array (1 .. OS_Constants.PTHREAD_MUTEX_SIZE);
 640    end record;
 641    pragma Convention (C, pthread_mutex_t);
 642    for pthread_mutex_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 643
 644    type pthread_rwlockattr_t is record
 645       Data : char_array (1 .. OS_Constants.PTHREAD_RWLOCKATTR_SIZE);
 646    end record;
 647    pragma Convention (C, pthread_rwlockattr_t);
 648    for pthread_rwlockattr_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 649
 650    type pthread_rwlock_t is record
 651       Data : char_array (1 .. OS_Constants.PTHREAD_RWLOCK_SIZE);
 652    end record;
 653    pragma Convention (C, pthread_rwlock_t);
 654    for pthread_rwlock_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 655
 656    type pthread_cond_t is record
 657       Data : char_array (1 .. OS_Constants.PTHREAD_COND_SIZE);
 658    end record;
 659    pragma Convention (C, pthread_cond_t);
 660    for pthread_cond_t'Alignment use Interfaces.Unsigned_64'Alignment;
 661
 662    type pthread_key_t is new unsigned;
 663
 664 end System.OS_Interface;