gcc/ada/s-osinte-android.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) 1995-2014, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNARL was developed by the GNARL team at Florida State University.       --
  28 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This is an Android version of this package which is based on the
  33 --  GNU/Linux version
  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    subtype int            is Interfaces.C.int;
  50    subtype char           is Interfaces.C.char;
  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 := System.Linux.EAGAIN;
  68    EINTR     : constant := System.Linux.EINTR;
  69    EINVAL    : constant := System.Linux.EINVAL;
  70    ENOMEM    : constant := System.Linux.ENOMEM;
  71    EPERM     : constant := System.Linux.EPERM;
  72    ETIMEDOUT : constant := System.Linux.ETIMEDOUT;
  73
  74    -------------
  75    -- Signals --
  76    -------------
  77
  78    Max_Interrupt : constant := 31;
  79    type Signal is new int range 0 .. Max_Interrupt;
  80    for Signal'Size use int'Size;
  81
  82    SIGHUP     : constant := System.Linux.SIGHUP;
  83    SIGINT     : constant := System.Linux.SIGINT;
  84    SIGQUIT    : constant := System.Linux.SIGQUIT;
  85    SIGILL     : constant := System.Linux.SIGILL;
  86    SIGTRAP    : constant := System.Linux.SIGTRAP;
  87    SIGIOT     : constant := System.Linux.SIGIOT;
  88    SIGABRT    : constant := System.Linux.SIGABRT;
  89    SIGFPE     : constant := System.Linux.SIGFPE;
  90    SIGKILL    : constant := System.Linux.SIGKILL;
  91    SIGBUS     : constant := System.Linux.SIGBUS;
  92    SIGSEGV    : constant := System.Linux.SIGSEGV;
  93    SIGPIPE    : constant := System.Linux.SIGPIPE;
  94    SIGALRM    : constant := System.Linux.SIGALRM;
  95    SIGTERM    : constant := System.Linux.SIGTERM;
  96    SIGUSR1    : constant := System.Linux.SIGUSR1;
  97    SIGUSR2    : constant := System.Linux.SIGUSR2;
  98    SIGCLD     : constant := System.Linux.SIGCLD;
  99    SIGCHLD    : constant := System.Linux.SIGCHLD;
 100    SIGPWR     : constant := System.Linux.SIGPWR;
 101    SIGWINCH   : constant := System.Linux.SIGWINCH;
 102    SIGURG     : constant := System.Linux.SIGURG;
 103    SIGPOLL    : constant := System.Linux.SIGPOLL;
 104    SIGIO      : constant := System.Linux.SIGIO;
 105    SIGLOST    : constant := System.Linux.SIGLOST;
 106    SIGSTOP    : constant := System.Linux.SIGSTOP;
 107    SIGTSTP    : constant := System.Linux.SIGTSTP;
 108    SIGCONT    : constant := System.Linux.SIGCONT;
 109    SIGTTIN    : constant := System.Linux.SIGTTIN;
 110    SIGTTOU    : constant := System.Linux.SIGTTOU;
 111    SIGVTALRM  : constant := System.Linux.SIGVTALRM;
 112    SIGPROF    : constant := System.Linux.SIGPROF;
 113    SIGXCPU    : constant := System.Linux.SIGXCPU;
 114    SIGXFSZ    : constant := System.Linux.SIGXFSZ;
 115    SIGUNUSED  : constant := System.Linux.SIGUNUSED;
 116    SIGSTKFLT  : constant := System.Linux.SIGSTKFLT;
 117
 118    SIGADAABORT : constant := SIGABRT;
 119    --  Change this to use another signal for task abort. SIGTERM might be a
 120    --  good one.
 121
 122    type Signal_Set is array (Natural range <>) of Signal;
 123
 124    Unmasked : constant Signal_Set := (
 125       SIGTRAP,
 126       --  To enable debugging on multithreaded applications, mark SIGTRAP to
 127       --  be kept unmasked.
 128
 129       SIGBUS,
 130
 131       SIGTTIN, SIGTTOU, SIGTSTP,
 132       --  Keep these three signals unmasked so that background processes and IO
 133       --  behaves as normal "C" applications
 134
 135       SIGPROF,
 136       --  To avoid confusing the profiler
 137
 138       SIGKILL, SIGSTOP);
 139       --  These two signals actually can't be masked (POSIX won't allow it)
 140
 141    Reserved : constant Signal_Set := (SIGVTALRM, SIGUNUSED);
 142    --  Not clear why these two signals are reserved. Perhaps they are not
 143    --  supported by this version of GNU/Linux ???
 144
 145    type sigset_t is private;
 146
 147    function sigaddset (set : access sigset_t; sig : Signal) return int;
 148    pragma Import (C, sigaddset, "_sigaddset");
 149
 150    function sigdelset (set : access sigset_t; sig : Signal) return int;
 151    pragma Import (C, sigdelset, "_sigdelset");
 152
 153    function sigfillset (set : access sigset_t) return int;
 154    pragma Import (C, sigfillset, "_sigfillset");
 155
 156    function sigismember (set : access sigset_t; sig : Signal) return int;
 157    pragma Import (C, sigismember, "_sigismember");
 158
 159    function sigemptyset (set : access sigset_t) return int;
 160    pragma Import (C, sigemptyset, "_sigemptyset");
 161
 162    type union_type_3 is new String (1 .. 116);
 163    type siginfo_t is record
 164       si_signo : int;
 165       si_code  : int;
 166       si_errno : int;
 167       X_data   : union_type_3;
 168    end record;
 169    pragma Convention (C, siginfo_t);
 170
 171    type struct_sigaction is record
 172       sa_handler  : System.Address;
 173       sa_mask     : sigset_t;
 174       sa_flags    : Interfaces.C.unsigned_long;
 175       sa_restorer : System.Address;
 176    end record;
 177    pragma Convention (C, struct_sigaction);
 178
 179    type struct_sigaction_ptr is access all struct_sigaction;
 180
 181    SA_SIGINFO : constant := System.Linux.SA_SIGINFO;
 182    SA_ONSTACK : constant := System.Linux.SA_ONSTACK;
 183    SA_NODEFER : constant := System.Linux.SA_NODEFER;
 184    SA_RESTART : constant := System.Linux.SA_RESTART;
 185
 186    SIG_BLOCK   : constant := 0;
 187    SIG_UNBLOCK : constant := 1;
 188    SIG_SETMASK : constant := 2;
 189
 190    SIG_DFL : constant := 0;
 191    SIG_IGN : constant := 1;
 192
 193    function sigaction
 194      (sig  : Signal;
 195       act  : struct_sigaction_ptr;
 196       oact : struct_sigaction_ptr) return int;
 197    pragma Import (C, sigaction, "sigaction");
 198
 199    ----------
 200    -- Time --
 201    ----------
 202
 203    Time_Slice_Supported : constant Boolean := True;
 204    --  Indicates whether time slicing is supported
 205
 206    type timespec is private;
 207
 208    type clockid_t is new int;
 209
 210    function clock_gettime
 211      (clock_id : clockid_t;
 212       tp       : access timespec) return int;
 213
 214    function To_Duration (TS : timespec) return Duration;
 215    pragma Inline (To_Duration);
 216
 217    function To_Timespec (D : Duration) return timespec;
 218    pragma Inline (To_Timespec);
 219
 220    function sysconf (name : int) return long;
 221    pragma Import (C, sysconf);
 222
 223    SC_CLK_TCK          : constant := 2;
 224    SC_NPROCESSORS_ONLN : constant := 84;
 225
 226    -------------------------
 227    -- Priority Scheduling --
 228    -------------------------
 229
 230    SCHED_OTHER : constant := 0;
 231    SCHED_FIFO  : constant := 1;
 232    SCHED_RR    : constant := 2;
 233
 234    function To_Target_Priority
 235      (Prio : System.Any_Priority)
 236       return Interfaces.C.int is (Interfaces.C.int (Prio));
 237    --  Maps System.Any_Priority to a POSIX priority
 238
 239    -------------
 240    -- Process --
 241    -------------
 242
 243    type pid_t is private;
 244
 245    function kill (pid : pid_t; sig : Signal) return int;
 246    pragma Import (C, kill, "kill");
 247
 248    function getpid return pid_t;
 249    pragma Import (C, getpid, "getpid");
 250
 251    -------------
 252    -- Threads --
 253    -------------
 254
 255    type Thread_Body is access
 256      function (arg : System.Address) return System.Address;
 257    pragma Convention (C, Thread_Body);
 258
 259    function Thread_Body_Access is new
 260      Ada.Unchecked_Conversion (System.Address, Thread_Body);
 261
 262    type pthread_t is new unsigned_long;
 263    subtype Thread_Id is pthread_t;
 264
 265    function To_pthread_t is
 266      new Ada.Unchecked_Conversion (unsigned_long, pthread_t);
 267
 268    type pthread_mutex_t      is limited private;
 269    type pthread_cond_t       is limited private;
 270    type pthread_attr_t       is limited private;
 271    type pthread_mutexattr_t  is limited private;
 272    type pthread_condattr_t   is limited private;
 273    type pthread_key_t        is private;
 274
 275    PTHREAD_CREATE_DETACHED : constant := 1;
 276
 277    PTHREAD_SCOPE_PROCESS : constant := 1;
 278    PTHREAD_SCOPE_SYSTEM  : constant := 0;
 279
 280    --  Read/Write lock not supported on Android.
 281
 282    subtype pthread_rwlock_t     is pthread_mutex_t;
 283    subtype pthread_rwlockattr_t is pthread_mutexattr_t;
 284
 285    -----------
 286    -- Stack --
 287    -----------
 288
 289    type stack_t is record
 290       ss_sp    : System.Address;
 291       ss_flags : int;
 292       ss_size  : size_t;
 293    end record;
 294    pragma Convention (C, stack_t);
 295
 296    function sigaltstack
 297      (ss  : not null access stack_t;
 298       oss : access stack_t) return int;
 299    pragma Import (C, sigaltstack, "sigaltstack");
 300
 301    Alternate_Stack : aliased System.Address;
 302    pragma Import (C, Alternate_Stack, "__gnat_alternate_stack");
 303    --  The alternate signal stack for stack overflows
 304
 305    Alternate_Stack_Size : constant := 16 * 1024;
 306    --  This must be in keeping with init.c:__gnat_alternate_stack
 307
 308    Stack_Base_Available : constant Boolean := False;
 309    --  Indicates whether the stack base is available on this target
 310
 311    function Get_Stack_Base (thread : pthread_t)
 312      return Address is (Null_Address);
 313    --  This is a dummy procedure to share some GNULLI files
 314
 315    function Get_Page_Size return size_t;
 316    function Get_Page_Size return Address;
 317    pragma Import (C, Get_Page_Size, "_getpagesize");
 318    --  Returns the size of a page
 319
 320    PROT_NONE  : constant := 0;
 321    PROT_READ  : constant := 1;
 322    PROT_WRITE : constant := 2;
 323    PROT_EXEC  : constant := 4;
 324    PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;
 325    PROT_ON    : constant := PROT_READ;
 326    PROT_OFF   : constant := PROT_ALL;
 327
 328    function mprotect (addr : Address; len : size_t; prot : int) return int;
 329    pragma Import (C, mprotect);
 330
 331    ---------------------------------------
 332    -- Nonstandard Thread Initialization --
 333    ---------------------------------------
 334
 335    procedure pthread_init is null;
 336    --  This is a dummy procedure to share some GNULLI files
 337
 338    -------------------------
 339    -- POSIX.1c  Section 3 --
 340    -------------------------
 341
 342    function sigwait (set : access sigset_t; sig : access Signal) return int;
 343    pragma Import (C, sigwait, "sigwait");
 344
 345    function pthread_kill (thread : pthread_t; sig : Signal) return int;
 346    pragma Import (C, pthread_kill, "pthread_kill");
 347
 348    function pthread_sigmask
 349      (how  : int;
 350       set  : access sigset_t;
 351       oset : access sigset_t) return int;
 352    pragma Import (C, pthread_sigmask, "sigprocmask");
 353    --  pthread_sigmask maybe be broken due to mismatch between sigset_t and
 354    --  kernel_sigset_t, substitute sigprocmask temporarily.  ???
 355    --  pragma Import (C, pthread_sigmask, "pthread_sigmask");
 356
 357    --------------------------
 358    -- POSIX.1c  Section 11 --
 359    --------------------------
 360
 361    function pthread_mutexattr_init
 362      (attr : access pthread_mutexattr_t) return int;
 363    pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");
 364
 365    function pthread_mutexattr_destroy
 366      (attr : access pthread_mutexattr_t) return int;
 367    pragma Import (C, pthread_mutexattr_destroy, "pthread_mutexattr_destroy");
 368
 369    function pthread_mutex_init
 370      (mutex : access pthread_mutex_t;
 371       attr  : access pthread_mutexattr_t) return int;
 372    pragma Import (C, pthread_mutex_init, "pthread_mutex_init");
 373
 374    function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;
 375    pragma Import (C, pthread_mutex_destroy, "pthread_mutex_destroy");
 376
 377    function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;
 378    pragma Import (C, pthread_mutex_lock, "pthread_mutex_lock");
 379
 380    function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;
 381    pragma Import (C, pthread_mutex_unlock, "pthread_mutex_unlock");
 382
 383    function pthread_condattr_init
 384      (attr : access pthread_condattr_t) return int;
 385    pragma Import (C, pthread_condattr_init, "pthread_condattr_init");
 386
 387    function pthread_condattr_destroy
 388      (attr : access pthread_condattr_t) return int;
 389    pragma Import (C, pthread_condattr_destroy, "pthread_condattr_destroy");
 390
 391    function pthread_cond_init
 392      (cond : access pthread_cond_t;
 393       attr : access pthread_condattr_t) return int;
 394    pragma Import (C, pthread_cond_init, "pthread_cond_init");
 395
 396    function pthread_cond_destroy (cond : access pthread_cond_t) return int;
 397    pragma Import (C, pthread_cond_destroy, "pthread_cond_destroy");
 398
 399    function pthread_cond_signal (cond : access pthread_cond_t) return int;
 400    pragma Import (C, pthread_cond_signal, "pthread_cond_signal");
 401
 402    function pthread_cond_wait
 403      (cond  : access pthread_cond_t;
 404       mutex : access pthread_mutex_t) return int;
 405    pragma Import (C, pthread_cond_wait, "pthread_cond_wait");
 406
 407    function pthread_cond_timedwait
 408      (cond    : access pthread_cond_t;
 409       mutex   : access pthread_mutex_t;
 410       abstime : access timespec) return int;
 411    pragma Import (C, pthread_cond_timedwait, "pthread_cond_timedwait");
 412
 413    Relative_Timed_Wait : constant Boolean := False;
 414    --  pthread_cond_timedwait requires an absolute delay time
 415
 416    --------------------------
 417    -- POSIX.1c  Section 13 --
 418    --------------------------
 419
 420    PTHREAD_PRIO_PROTECT : constant := 0;
 421    PTHREAD_PRIO_INHERIT : constant := 1;
 422
 423    function pthread_mutexattr_setprotocol
 424      (attr     : access pthread_mutexattr_t;
 425       protocol : int) return int is (0);
 426
 427    function pthread_mutexattr_setprioceiling
 428      (attr        : access pthread_mutexattr_t;
 429       prioceiling : int) return int is (0);
 430
 431    type struct_sched_param is record
 432       sched_priority : int;  --  scheduling priority
 433    end record;
 434    pragma Convention (C, struct_sched_param);
 435
 436    function pthread_setschedparam
 437      (thread : pthread_t;
 438       policy : int;
 439       param  : access struct_sched_param) return int;
 440    pragma Import (C, pthread_setschedparam, "pthread_setschedparam");
 441
 442    function pthread_attr_setscope
 443      (attr  : access pthread_attr_t;
 444       scope : int) return int;
 445    pragma Import (C, pthread_attr_setscope, "pthread_attr_setscope");
 446
 447    function pthread_attr_setschedpolicy
 448      (attr   : access pthread_attr_t;
 449       policy : int) return int;
 450    pragma Import
 451      (C, pthread_attr_setschedpolicy, "pthread_attr_setschedpolicy");
 452
 453    function sched_yield return int;
 454    pragma Import (C, sched_yield, "sched_yield");
 455
 456    ---------------------------
 457    -- P1003.1c - Section 16 --
 458    ---------------------------
 459
 460    function pthread_attr_init
 461      (attributes : access pthread_attr_t) return int;
 462    pragma Import (C, pthread_attr_init, "pthread_attr_init");
 463
 464    function pthread_attr_destroy
 465      (attributes : access pthread_attr_t) return int;
 466    pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");
 467
 468    function pthread_attr_setdetachstate
 469      (attr        : access pthread_attr_t;
 470       detachstate : int) return int;
 471    pragma Import
 472      (C, pthread_attr_setdetachstate, "pthread_attr_setdetachstate");
 473
 474    function pthread_attr_setstacksize
 475      (attr      : access pthread_attr_t;
 476       stacksize : size_t) return int;
 477    pragma Import (C, pthread_attr_setstacksize, "pthread_attr_setstacksize");
 478
 479    function pthread_create
 480      (thread        : access pthread_t;
 481       attributes    : access pthread_attr_t;
 482       start_routine : Thread_Body;
 483       arg           : System.Address) return int;
 484    pragma Import (C, pthread_create, "pthread_create");
 485
 486    procedure pthread_exit (status : System.Address);
 487    pragma Import (C, pthread_exit, "pthread_exit");
 488
 489    function pthread_self return pthread_t;
 490    pragma Import (C, pthread_self, "pthread_self");
 491
 492    function lwp_self return System.Address;
 493    pragma Import (C, lwp_self, "__gnat_lwp_self");
 494
 495    --------------------------
 496    -- POSIX.1c  Section 17 --
 497    --------------------------
 498
 499    function pthread_setspecific
 500      (key   : pthread_key_t;
 501       value : System.Address) return int;
 502    pragma Import (C, pthread_setspecific, "pthread_setspecific");
 503
 504    function pthread_getspecific (key : pthread_key_t) return System.Address;
 505    pragma Import (C, pthread_getspecific, "pthread_getspecific");
 506
 507    type destructor_pointer is access procedure (arg : System.Address);
 508    pragma Convention (C, destructor_pointer);
 509
 510    function pthread_key_create
 511      (key        : access pthread_key_t;
 512       destructor : destructor_pointer) return int;
 513    pragma Import (C, pthread_key_create, "pthread_key_create");
 514
 515    CPU_SETSIZE : constant := 1_024;
 516    --  Size of the cpu_set_t mask on most linux systems (SUSE 11 uses 4_096).
 517    --  This is kept for backward compatibility (System.Task_Info uses it), but
 518    --  the run-time library does no longer rely on static masks, using
 519    --  dynamically allocated masks instead.
 520
 521    type bit_field is array (1 .. CPU_SETSIZE) of Boolean;
 522    for bit_field'Size use CPU_SETSIZE;
 523    pragma Pack (bit_field);
 524    pragma Convention (C, bit_field);
 525
 526    type cpu_set_t is record
 527       bits : bit_field;
 528    end record;
 529    pragma Convention (C, cpu_set_t);
 530
 531    type cpu_set_t_ptr is access all cpu_set_t;
 532    --  In the run-time library we use this pointer because the size of type
 533    --  cpu_set_t varies depending on the glibc version. Hence, objects of type
 534    --  cpu_set_t are allocated dynamically using the number of processors
 535    --  available in the target machine (value obtained at execution time).
 536
 537    function CPU_ALLOC (count : size_t) return cpu_set_t_ptr;
 538    pragma Import (C, CPU_ALLOC, "__gnat_cpu_alloc");
 539    --  Wrapper around the CPU_ALLOC C macro
 540
 541    function CPU_ALLOC_SIZE (count : size_t) return size_t;
 542    pragma Import (C, CPU_ALLOC_SIZE, "__gnat_cpu_alloc_size");
 543    --  Wrapper around the CPU_ALLOC_SIZE C macro
 544
 545    procedure CPU_FREE (cpuset : cpu_set_t_ptr);
 546    pragma Import (C, CPU_FREE, "__gnat_cpu_free");
 547    --  Wrapper around the CPU_FREE C macro
 548
 549    procedure CPU_ZERO (count : size_t; cpuset : cpu_set_t_ptr);
 550    pragma Import (C, CPU_ZERO, "__gnat_cpu_zero");
 551    --  Wrapper around the CPU_ZERO_S C macro
 552
 553    procedure CPU_SET (cpu : int; count : size_t; cpuset : cpu_set_t_ptr);
 554    pragma Import (C, CPU_SET, "__gnat_cpu_set");
 555    --  Wrapper around the CPU_SET_S C macro
 556
 557    function pthread_setaffinity_np
 558      (thread     : pthread_t;
 559       cpusetsize : size_t;
 560       cpuset     : cpu_set_t_ptr) return int;
 561    pragma Import (C, pthread_setaffinity_np, "pthread_setaffinity_np");
 562    pragma Weak_External (pthread_setaffinity_np);
 563    --  Use a weak symbol because this function may be available or not,
 564    --  depending on the version of the system.
 565
 566    function pthread_attr_setaffinity_np
 567      (attr       : access pthread_attr_t;
 568       cpusetsize : size_t;
 569       cpuset     : cpu_set_t_ptr) return int;
 570    pragma Import (C, pthread_attr_setaffinity_np,
 571                     "pthread_attr_setaffinity_np");
 572    pragma Weak_External (pthread_attr_setaffinity_np);
 573    --  Use a weak symbol because this function may be available or not,
 574    --  depending on the version of the system.
 575
 576 private
 577
 578    type sigset_t is new Interfaces.C.unsigned_long;
 579    pragma Convention (C, sigset_t);
 580    for sigset_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 581
 582    pragma Warnings (Off);
 583    for struct_sigaction use record
 584       sa_handler at Linux.sa_handler_pos range 0 .. Standard'Address_Size - 1;
 585       sa_mask    at Linux.sa_mask_pos range 0 .. sigset_t'Size - 1;
 586       sa_flags   at Linux.sa_flags_pos
 587         range 0 .. Interfaces.C.unsigned_long'Size - 1;
 588    end record;
 589    --  We intentionally leave sa_restorer unspecified and let the compiler
 590    --  append it after the last field, so disable corresponding warning.
 591    pragma Warnings (On);
 592
 593    type pid_t is new int;
 594
 595    type time_t is new long;
 596
 597    type timespec is record
 598       tv_sec  : time_t;
 599       tv_nsec : long;
 600    end record;
 601    pragma Convention (C, timespec);
 602
 603    type unsigned_long_long_t is mod 2 ** 64;
 604    --  Local type only used to get the alignment of this type below
 605
 606    subtype char_array is Interfaces.C.char_array;
 607
 608    type pthread_attr_t is record
 609       Data : char_array (1 .. OS_Constants.PTHREAD_ATTR_SIZE);
 610    end record;
 611    pragma Convention (C, pthread_attr_t);
 612    for pthread_attr_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 613
 614    type pthread_condattr_t is record
 615       Data : char_array (1 .. OS_Constants.PTHREAD_CONDATTR_SIZE);
 616    end record;
 617    pragma Convention (C, pthread_condattr_t);
 618    for pthread_condattr_t'Alignment use Interfaces.C.int'Alignment;
 619
 620    type pthread_mutexattr_t is record
 621       Data : char_array (1 .. OS_Constants.PTHREAD_MUTEXATTR_SIZE);
 622    end  record;
 623    pragma Convention (C, pthread_mutexattr_t);
 624    for pthread_mutexattr_t'Alignment use Interfaces.C.int'Alignment;
 625
 626    type pthread_mutex_t is record
 627       Data : char_array (1 .. OS_Constants.PTHREAD_MUTEX_SIZE);
 628    end record;
 629    pragma Convention (C, pthread_mutex_t);
 630    for pthread_mutex_t'Alignment use Interfaces.C.unsigned_long'Alignment;
 631
 632    type pthread_cond_t is record
 633       Data : char_array (1 .. OS_Constants.PTHREAD_COND_SIZE);
 634    end record;
 635    pragma Convention (C, pthread_cond_t);
 636    for pthread_cond_t'Alignment use unsigned_long_long_t'Alignment;
 637
 638    type pthread_key_t is new unsigned;
 639
 640 end System.OS_Interface;