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------------------------------------------------------------------------------

--                                                                          --

--                 GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS                 --

--                                                                          --

--                   S Y S T E M . O S _ I N T E R F A C E                  --

--                                                                          --

--                                  S p e c                                 --

--                                                                          --

--             Copyright (C) 1991-1994, Florida State University            --

--             Copyright (C) 1995-2005, Free Software Foundation, Inc.      --

--                                                                          --

-- GNARL is free software; you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 2,  or (at your option) any later ver- --

-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNARL; see file COPYING.  If not, write --

-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --

-- Boston, MA 02110-1301, USA.                                              --

--                                                                          --

-- As a special exception,  if other files  instantiate  generics from this --

-- unit, or you link  this unit with other files  to produce an executable, --

-- this  unit  does not  by itself cause  the resulting  executable  to  be --

-- covered  by the  GNU  General  Public  License.  This exception does not --

-- however invalidate  any other reasons why  the executable file  might be --

-- covered by the  GNU Public License.                                      --

--                                                                          --

-- GNARL was developed by the GNARL team at Florida State University.       --

-- Extensive contributions were provided by Ada Core Technologies, Inc.     --

--                                                                          --

------------------------------------------------------------------------------

--  This is the DEC Unix 4.0/5.1 version of this package

--  This package encapsulates all direct interfaces to OS services

--  that are needed by children of System.

--  PLEASE DO NOT add any with-clauses to this package or remove the pragma

--  Preelaborate. This package is designed to be a bottom-level (leaf) package.

with Interfaces.C;

with Unchecked_Conversion;

package System.OS_Interface is

   pragma Preelaborate;

   pragma Linker_Options ("-lpthread");

   pragma Linker_Options ("-lmach");

   pragma Linker_Options ("-lexc");

   pragma Linker_Options ("-lrt");

   subtype int            is Interfaces.C.int;

   subtype short          is Interfaces.C.short;

   subtype long           is Interfaces.C.long;

   subtype unsigned       is Interfaces.C.unsigned;

   subtype unsigned_short is Interfaces.C.unsigned_short;

   subtype unsigned_long  is Interfaces.C.unsigned_long;

   subtype unsigned_char  is Interfaces.C.unsigned_char;

   subtype plain_char     is Interfaces.C.plain_char;

   subtype size_t         is Interfaces.C.size_t;

   subtype char_array     is Interfaces.C.char_array;

   -----------

   -- Errno --

   -----------

   function errno return int;

   pragma Import (C, errno, "_Geterrno");

   EAGAIN    : constant := 35;

   EINTR     : constant := 4;

   EINVAL    : constant := 22;

   ENOMEM    : constant := 12;

   ETIMEDOUT : constant := 60;

   -------------

   -- Signals --

   -------------

   Max_Interrupt : constant := 48;

   type Signal is new int range 0 .. Max_Interrupt;

   for Signal'Size use int'Size;

   SIGHUP     : constant := 1; --  hangup

   SIGINT     : constant := 2; --  interrupt (rubout)

   SIGQUIT    : constant := 3; --  quit (ASCD FS)

   SIGILL     : constant := 4; --  illegal instruction (not reset)

   SIGTRAP    : constant := 5; --  trace trap (not reset)

   SIGABRT    : constant := 6; --  used by abort, replace SIGIOT in the  future

   SIGIOT     : constant := 6; --  abort (terminate) process

   SIGLOST    : constant := 6; --  old BSD signal ??

   SIGEMT     : constant := 7; --  EMT instruction

   SIGFPE     : constant := 8; --  floating point exception

   SIGKILL    : constant := 9; --  kill (cannot be caught or ignored)

   SIGBUS     : constant := 10; --  bus error

   SIGSEGV    : constant := 11; --  segmentation violation

   SIGSYS     : constant := 12; --  bad argument to system call

   SIGPIPE    : constant := 13; --  write on a pipe with no one to read it

   SIGALRM    : constant := 14; --  alarm clock

   SIGTERM    : constant := 15; --  software termination signal from kill

   SIGURG     : constant := 16; --  urgent condition on IO channel

   SIGIOINT   : constant := 16; --  printer to backend error signal

   SIGSTOP    : constant := 17; --  stop (cannot be caught or ignored)

   SIGTSTP    : constant := 18; --  user stop requested from tty

   SIGCONT    : constant := 19; --  stopped process has been continued

   SIGCHLD    : constant := 20; --  child status change

   SIGTTIN    : constant := 21; --  background tty read attempted

   SIGTTOU    : constant := 22; --  background tty write attempted

   SIGPOLL    : constant := 23; --  I/O possible, or completed

   SIGIO      : constant := 23; --  STREAMS version of SIGPOLL

   SIGAIO     : constant := 23; --  base lan i/o

   SIGPTY     : constant := 23; --  pty i/o

   SIGXCPU    : constant := 24; --  CPU time limit exceeded

   SIGXFSZ    : constant := 25; --  filesize limit exceeded

   SIGVTALRM  : constant := 26; --  virtual timer expired

   SIGPROF    : constant := 27; --  profiling timer expired

   SIGWINCH   : constant := 28; --  window size change

   SIGINFO    : constant := 29; --  information request

   SIGPWR     : constant := 29; --  Power Fail/Restart -- SVID3/SVR4

   SIGUSR1    : constant := 30; --  user defined signal 1

   SIGUSR2    : constant := 31; --  user defined signal 2

   SIGRESV    : constant := 32; --  reserved by Digital for future use

   SIGADAABORT : constant := SIGABRT;

   type Signal_Set is array (Natural range <>) of Signal;

   Unmasked    : constant Signal_Set := (0 .. 0 => SIGTRAP);

   Reserved    : constant Signal_Set := (SIGALRM, SIGABRT, SIGKILL, SIGSTOP);

   type sigset_t is private;

   function sigaddset (set : access sigset_t; sig : Signal) return int;

   pragma Import (C, sigaddset);

   function sigdelset (set : access sigset_t; sig : Signal) return int;

   pragma Import (C, sigdelset);

   function sigfillset (set : access sigset_t) return int;

   pragma Import (C, sigfillset);

   function sigismember (set : access sigset_t; sig : Signal) return int;

   pragma Import (C, sigismember);

   function sigemptyset (set : access sigset_t) return int;

   pragma Import (C, sigemptyset);

   type union_type_3 is new String (1 .. 116);

   type siginfo_t is record

      si_signo     : int;

      si_errno     : int;

      si_code      : int;

      X_data       : union_type_3;

   end record;

   for siginfo_t'Size use 8 * 128;

   pragma Convention (C, siginfo_t);

   type struct_sigaction is record

      sa_handler : System.Address;

      sa_mask    : sigset_t;

      sa_flags   : int;

      sa_signo   : int;

   end record;

   pragma Convention (C, struct_sigaction);

   type struct_sigaction_ptr is access all struct_sigaction;

   SIG_BLOCK   : constant := 1;

   SIG_UNBLOCK : constant := 2;

   SIG_SETMASK : constant := 3;

   SIG_DFL : constant := 0;

   SIG_IGN : constant := 1;

   SA_NODEFER : constant := 8;

   SA_SIGINFO : constant := 16#40#;

   function sigaction

     (sig  : Signal;

      act  : struct_sigaction_ptr;

      oact : struct_sigaction_ptr) return int;

   pragma Import (C, sigaction);

   ----------

   -- Time --

   ----------

   type timespec is private;

   function nanosleep (rqtp, rmtp : access timespec)  return int;

   pragma Import (C, nanosleep);

   type clockid_t is private;

   CLOCK_REALTIME : constant clockid_t;

   function clock_gettime

     (clock_id : clockid_t;

      tp       : access timespec) return int;

   pragma Import (C, clock_gettime);

   function To_Duration (TS : timespec) return Duration;

   pragma Inline (To_Duration);

   function To_Timespec (D : Duration) return timespec;

   pragma Inline (To_Timespec);

   type struct_timezone is record

      tz_minuteswest : int;

      tz_dsttime     : int;

   end record;

   pragma Convention (C, struct_timezone);

   type struct_timeval is private;

   --  This is needed on systems that do not have clock_gettime()

   --  but do have gettimeofday().

   function To_Duration (TV : struct_timeval) return Duration;

   pragma Inline (To_Duration);

   function To_Timeval (D : Duration) return struct_timeval;

   pragma Inline (To_Timeval);

   -------------------------

   -- Priority Scheduling --

   -------------------------

   SCHED_FIFO  : constant := 1;

   SCHED_RR    : constant := 2;

   SCHED_OTHER : constant := 3;

   SCHED_LFI   : constant := 5;

   -------------

   -- Process --

   -------------

   type pid_t is private;

   function kill (pid : pid_t; sig : Signal) return int;

   pragma Import (C, kill);

   function getpid return pid_t;

   pragma Import (C, getpid);

   BIND_NO_INHERIT  : constant := 1;

   function bind_to_cpu

     (pid       : pid_t;

      cpu_mask  : unsigned_long;

      flag      : unsigned_long := BIND_NO_INHERIT) return int;

   pragma Import (C, bind_to_cpu);

   -------------

   -- Threads --

   -------------

   type Thread_Body is access

     function (arg : System.Address) return System.Address;

   function Thread_Body_Access is new

     Unchecked_Conversion (System.Address, Thread_Body);

   type pthread_t           is private;

   subtype Thread_Id        is pthread_t;

   type pthread_mutex_t     is limited private;

   type pthread_cond_t      is limited private;

   type pthread_attr_t      is limited private;

   type pthread_mutexattr_t is limited private;

   type pthread_condattr_t  is limited private;

   type pthread_key_t       is private;

   PTHREAD_CREATE_DETACHED : constant := 1;

   PTHREAD_SCOPE_PROCESS : constant := 0;

   PTHREAD_SCOPE_SYSTEM  : constant := 1;

   PTHREAD_EXPLICIT_SCHED : constant := 1;

   -----------

   -- Stack --

   -----------

   Stack_Base_Available : constant Boolean := False;

   --  Indicates wether the stack base is available on this target.

   function Get_Stack_Base (thread : pthread_t) return Address;

   pragma Inline (Get_Stack_Base);

   --  returns the stack base of the specified thread.

   --  Only call this function when Stack_Base_Available is True.

   function Get_Page_Size return size_t;

   function Get_Page_Size return Address;

   pragma Import (C, Get_Page_Size, "getpagesize");

   --  returns the size of a page, or 0 if this is not relevant on this

   --  target

   PROT_NONE  : constant := 0;

   PROT_READ  : constant := 1;

   PROT_WRITE : constant := 2;

   PROT_EXEC  : constant := 4;

   PROT_ALL   : constant := PROT_READ + PROT_WRITE + PROT_EXEC;

   PROT_ON    : constant := PROT_READ;

   PROT_OFF   : constant := PROT_ALL;

   function mprotect (addr : Address; len : size_t; prot : int) return int;

   pragma Import (C, mprotect);

   procedure Hide_Yellow_Zone;

   --  Every thread except the initial one features an overflow warning area

   --  just above the overflow guard area on the stack. They are called

   --  the Yellow Zone and the Red Zone respectively. This procedure hides

   --  the former so that the latter could be exposed to stack probing.

   ---------------------------------------

   -- Nonstandard Thread Initialization --

   ---------------------------------------

   procedure pthread_init;

   pragma Inline (pthread_init);

   --  This is a dummy procedure to share some GNULLI files

   -------------------------

   -- POSIX.1c  Section 3 --

   -------------------------

   function sigwait

     (set : access sigset_t;

      sig : access Signal) return int;

   pragma Import (C, sigwait, "__sigwaitd10");

   function pthread_kill

     (thread : pthread_t;

      sig    : Signal) return int;

   pragma Import (C, pthread_kill);

   type sigset_t_ptr is access all sigset_t;

   function pthread_sigmask

     (how  : int;

      set  : sigset_t_ptr;

      oset : sigset_t_ptr) return int;

   pragma Import (C, pthread_sigmask);

   --------------------------

   -- POSIX.1c  Section 11 --

   --------------------------

   function pthread_mutexattr_init (attr : access pthread_mutexattr_t)

     return int;

   pragma Import (C, pthread_mutexattr_init);

   function pthread_mutexattr_destroy

     (attr : access pthread_mutexattr_t) return int;

   pragma Import (C, pthread_mutexattr_destroy);

   function pthread_mutex_init

     (mutex : access pthread_mutex_t;

      attr  : access pthread_mutexattr_t) return int;

   pragma Import (C, pthread_mutex_init, "__pthread_mutex_init");

   function pthread_mutex_destroy (mutex : access pthread_mutex_t) return int;

   pragma Import (C, pthread_mutex_destroy, "__pthread_mutex_destroy");

   function pthread_mutex_lock (mutex : access pthread_mutex_t) return int;

   pragma Import (C, pthread_mutex_lock, "__pthread_mutex_lock");

   function pthread_mutex_unlock (mutex : access pthread_mutex_t) return int;

   pragma Import (C, pthread_mutex_unlock, "__pthread_mutex_unlock");

   function pthread_condattr_init

     (attr : access pthread_condattr_t) return int;

   pragma Import (C, pthread_condattr_init);

   function pthread_condattr_destroy

     (attr : access pthread_condattr_t) return int;

   pragma Import (C, pthread_condattr_destroy);

   function pthread_cond_init

     (cond : access pthread_cond_t;

      attr : access pthread_condattr_t) return int;

   pragma Import (C, pthread_cond_init, "__pthread_cond_init");

   function pthread_cond_destroy (cond : access pthread_cond_t) return int;

   pragma Import (C, pthread_cond_destroy, "__pthread_cond_destroy");

   function pthread_cond_signal (cond : access pthread_cond_t) return int;

   pragma Import (C, pthread_cond_signal, "__pthread_cond_signal");

   function pthread_cond_wait

     (cond  : access pthread_cond_t;

      mutex : access pthread_mutex_t) return  int;

   pragma Import (C, pthread_cond_wait, "__pthread_cond_wait");

   function pthread_cond_timedwait

     (cond    : access pthread_cond_t;

      mutex   : access pthread_mutex_t;

      abstime : access timespec) return int;

   pragma Import (C, pthread_cond_timedwait, "__pthread_cond_timedwait");

   --------------------------

   -- POSIX.1c  Section 13 --

   --------------------------

   function pthread_mutexattr_setprotocol

     (attr     : access pthread_mutexattr_t;

      protocol : int) return int;

   pragma Import (C, pthread_mutexattr_setprotocol);

   function pthread_mutexattr_setprioceiling

     (attr     : access pthread_mutexattr_t;

      prioceiling : int) return int;

   pragma Import (C, pthread_mutexattr_setprioceiling);

   type struct_sched_param is record

      sched_priority : int;  --  scheduling priority

   end record;

   function pthread_setschedparam

     (thread : pthread_t;

      policy : int;

      param  : access struct_sched_param) return int;

   pragma Import (C, pthread_setschedparam);

   function pthread_attr_setscope

     (attr            : access pthread_attr_t;

      contentionscope : int) return int;

   pragma Import (C, pthread_attr_setscope);

   function pthread_attr_setinheritsched

     (attr            : access pthread_attr_t;

      inheritsched    : int) return int;

   pragma Import (C, pthread_attr_setinheritsched,

     "__pthread_attr_setinheritsched");

   function pthread_attr_setschedpolicy

     (attr : access pthread_attr_t; policy : int) return int;

   pragma Import (C, pthread_attr_setschedpolicy);

   function pthread_attr_setschedparam

     (attr        : access pthread_attr_t;

      sched_param : access struct_sched_param) return int;

   pragma Import (C, pthread_attr_setschedparam);

   function sched_yield return int;

   pragma Import (C, sched_yield);

   --------------------------

   -- P1003.1c  Section 16 --

   --------------------------

   function pthread_attr_init (attributes : access pthread_attr_t)

     return int;

   pragma Import (C, pthread_attr_init);

   function pthread_attr_destroy (attributes : access pthread_attr_t)

     return int;

   pragma Import (C, pthread_attr_destroy);

   function pthread_attr_setdetachstate

     (attr        : access pthread_attr_t;

      detachstate : int) return int;

   pragma Import (C, pthread_attr_setdetachstate);

   function pthread_attr_setstacksize

     (attr      : access pthread_attr_t;

      stacksize : size_t) return int;

   pragma Import (C, pthread_attr_setstacksize, "__pthread_attr_setstacksize");

   function pthread_create

     (thread        : access pthread_t;

      attributes    : access pthread_attr_t;

      start_routine : Thread_Body;

      arg           : System.Address) return int;

   pragma Import (C, pthread_create, "__pthread_create");

   procedure pthread_exit (status : System.Address);

   pragma Import (C, pthread_exit, "__pthread_exit");

   function pthread_self return pthread_t;

   pragma Inline (pthread_self);

   --------------------------

   -- POSIX.1c  Section 17 --

   --------------------------

   function pthread_setspecific

     (key : pthread_key_t; value : System.Address) return int;

   pragma Import (C, pthread_setspecific, "__pthread_setspecific");

   function pthread_getspecific (key : pthread_key_t) return System.Address;

   pragma Import (C, pthread_getspecific, "__pthread_getspecific");

   type destructor_pointer is access procedure (arg : System.Address);

   function pthread_key_create

     (key        : access pthread_key_t;

      destructor : destructor_pointer) return int;

   pragma Import (C, pthread_key_create);

private

   type sigset_t is new unsigned_long;

   type pid_t is new int;

   type time_t is new int;

   type timespec is record

      tv_sec  : time_t;

      tv_nsec : long;

   end record;

   pragma Convention (C, timespec);

   type clockid_t is new int;

   CLOCK_REALTIME : constant clockid_t := 1;

   type struct_timeval is record

      tv_sec  : time_t;

      tv_usec : time_t;

   end record;

   pragma Convention (C, struct_timeval);

   type unsigned_long_array is array (Natural range <>) of unsigned_long;

   type pthread_t is new System.Address;

   type pthread_teb_t is record

      reserved1     : System.Address;

      reserved2     : System.Address;

      size          : unsigned_short;

      version       : unsigned_char;

      reserved3     : unsigned_char;

      external      : unsigned_char;

      reserved4     : char_array (0 .. 1);

      creator       : unsigned_char;

      sequence      : unsigned_long;

      reserved5     : unsigned_long_array (0 .. 1);

      per_kt_area   : System.Address;

      stack_base    : System.Address;

      stack_reserve : System.Address;

      stack_yellow  : System.Address;

      stack_guard   : System.Address;

      stack_size    : unsigned_long;

      tsd_values    : System.Address;

      tsd_count     : unsigned_long;

      reserved6     : unsigned;

      reserved7     : unsigned;

      thread_flags  : unsigned;

      thd_errno     : int;

      stack_hiwater : System.Address;

      home_rad      : unsigned_long;

   end record;

   pragma Convention (C, pthread_teb_t);

   type pthread_cond_t is record

      state     : unsigned;

      valid     : unsigned;

      name      : System.Address;

      arg       : unsigned;

      reserved1 : unsigned;

      sequence  : unsigned_long;

      block     : System.Address;

   end record;

   pragma Convention (C, pthread_cond_t);

   type pthread_attr_t is record

      valid    : long;

      name     : System.Address;

      arg      : unsigned_long;

      reserved : unsigned_long_array (0 .. 18);

   end record;

   pragma Convention (C, pthread_attr_t);

   type pthread_mutex_t is record

      lock     : unsigned;

      valid    : unsigned;

      name     : System.Address;

      arg      : unsigned;

      depth    : unsigned;

      sequence : unsigned_long;

      owner    : unsigned_long;

      block    : System.Address;

   end record;

   for pthread_mutex_t'Size use 8 * 48;

   pragma Convention (C, pthread_mutex_t);

   type pthread_mutexattr_t is record

      valid    : long;

      reserved : unsigned_long_array (0 .. 14);

   end record;

   pragma Convention (C, pthread_mutexattr_t);

   type pthread_condattr_t is record

      valid    : long;

      reserved : unsigned_long_array (0 .. 12);

   end record;

   pragma Convention (C, pthread_condattr_t);

   type pthread_key_t is new unsigned;

end System.OS_Interface;