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

--                                                                          --

--                GNU ADA 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) 1995-2005,2008 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 GNU/kFreeBSD (GNU/LinuxThreads) 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");

   subtype int            is Interfaces.C.int;

   subtype char           is Interfaces.C.char;

   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;

   -----------

   -- Errno --

   -----------

   function errno return int;

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

   EAGAIN   : constant := 35;

   EINTR    : constant := 4;

   EINVAL   : constant := 22;

   ENOMEM   : constant := 12;

   EPERM    : constant := 1;

   ETIMEDOUT    : constant := 60;

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

   -- Signals --

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

   Max_Interrupt : constant := 128;

   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)

   SIGIOT     : constant := 6; --  IOT instruction

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

   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

   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

   SIGCLD     : constant := 20; --  alias for SIGCHLD

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

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

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

   SIGIO      : constant := 23; --  I/O possible (Solaris SIGPOLL alias)

   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 (NetBSD/FreeBSD)

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

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

   SIGLTHRRES : constant := 32; --  GNU/LinuxThreads restart signal

   SIGLTHRCAN : constant := 33; --  GNU/LinuxThreads cancel signal

   SIGLTHRDBG : constant := 34; --  GNU/LinuxThreads debugger signal

   SIGADAABORT : constant := SIGABRT;

   --  Change this if you want to use another signal for task abort.

   --  SIGTERM might be a good one.

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

   Unmasked    : constant Signal_Set := (

      SIGTRAP,

      --  To enable debugging on multithreaded applications, mark SIGTRAP to

      --  be kept unmasked.

      SIGBUS,

      SIGTTIN, SIGTTOU, SIGTSTP,

      --  Keep these three signals unmasked so that background processes

      --  and IO behaves as normal "C" applications

      SIGPROF,

      --  To avoid confusing the profiler

      SIGKILL, SIGSTOP,

      --  These two signals actually cannot be masked;

      --  POSIX simply won't allow it.

      SIGLTHRRES, SIGLTHRCAN, SIGLTHRDBG);

      --  These three signals are used by GNU/LinuxThreads starting from

      --  glibc 2.1 (future 2.2).

   Reserved    : constant Signal_Set :=

   --  I am not sure why the following signal is reserved.

   --  I guess they are not supported by this version of GNU/kFreeBSD.

     (0 .. 0 => SIGVTALRM);

   type sigset_t is private;

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

   pragma Import (C, sigaddset, "sigaddset");

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

   pragma Import (C, sigdelset, "sigdelset");

   function sigfillset (set : access sigset_t) return int;

   pragma Import (C, sigfillset, "sigfillset");

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

   pragma Import (C, sigismember, "sigismember");

   function sigemptyset (set : access sigset_t) return int;

   pragma Import (C, sigemptyset, "sigemptyset");

   --  sigcontext is architecture dependent, so define it private

   type struct_sigcontext is private;

   type struct_sigaction is record

      sa_handler : System.Address;

      sa_flags   : int;

      sa_mask    : sigset_t;

   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_SIGINFO : constant := 16#0040#;

   SA_ONSTACK : constant := 16#0001#;

   function sigaction

     (sig  : Signal;

      act  : struct_sigaction_ptr;

      oact : struct_sigaction_ptr) return int;

   pragma Import (C, sigaction, "sigaction");

   ----------

   -- Time --

   ----------

   type timespec is private;

   function To_Duration (TS : timespec) return Duration;

   pragma Inline (To_Duration);

   function To_Timespec (D : Duration) return timespec;

   pragma Inline (To_Timespec);

   function sysconf (name : int) return long;

   pragma Import (C, sysconf);

   SC_CLK_TCK          : constant := 2;

   SC_NPROCESSORS_ONLN : constant := 84;

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

   -- Priority Scheduling --

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

   SCHED_FIFO  : constant := 1;

   SCHED_OTHER : constant := 2;

   SCHED_RR    : constant := 3;

   function To_Target_Priority

     (Prio : System.Any_Priority) return Interfaces.C.int;

   --  Maps System.Any_Priority to a POSIX priority.

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

   -- Process --

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

   type pid_t is private;

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

   pragma Import (C, kill, "kill");

   function getpid return pid_t;

   pragma Import (C, getpid, "getpid");

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

   -- Threads --

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

   type Thread_Body is access

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

   pragma Convention (C, Thread_Body);

   function Thread_Body_Access is new

     Unchecked_Conversion (System.Address, Thread_Body);

   type pthread_t is new unsigned_long;

   subtype Thread_Id        is pthread_t;

   function To_pthread_t is new Unchecked_Conversion

     (unsigned_long, 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;

   -----------

   -- Stack --

   -----------

   type stack_t is record

      ss_sp    : System.Address;

      ss_size  : size_t;

      ss_flags : int;

   end record;

   pragma Convention (C, stack_t);

   function sigaltstack

     (ss  : not null access stack_t;

      oss : access stack_t) return int;

   pragma Import (C, sigaltstack, "sigaltstack");

   Alternate_Stack : aliased System.Address;

   --  This is a dummy definition, never used (Alternate_Stack_Size is null)

   Alternate_Stack_Size : constant := 0;

   --  No alternate signal stack is used on this platform

   function Get_Stack_Base (thread : pthread_t) return Address;

   pragma Inline (Get_Stack_Base);

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

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

   -- 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, "sigwait");

   function pthread_kill (thread : pthread_t; sig : Signal) return int;

   pragma Import (C, pthread_kill, "pthread_kill");

   function pthread_sigmask

     (how  : int;

      set  : access sigset_t;

      oset : access sigset_t) return int;

   pragma Import (C, pthread_sigmask, "pthread_sigmask");

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

   -- POSIX.1c  Section 11 --

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

   function pthread_mutexattr_init

     (attr : access pthread_mutexattr_t) return int;

   pragma Import (C, pthread_mutexattr_init, "pthread_mutexattr_init");

   function pthread_mutexattr_destroy

     (attr : access pthread_mutexattr_t) return int;

   pragma Import (C, pthread_mutexattr_destroy, "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, "pthread_condattr_init");

   function pthread_condattr_destroy

     (attr : access pthread_condattr_t) return int;

   pragma Import (C, pthread_condattr_destroy, "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");

   Relative_Timed_Wait : constant Boolean := False;

   --  pthread_cond_timedwait requires an absolute delay time

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

   -- POSIX.1c  Section 13 --

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

   type struct_sched_param is record

      sched_priority : int;  --  scheduling priority

   end record;

   pragma Convention (C, struct_sched_param);

   function pthread_setschedparam

     (thread : pthread_t;

      policy : int;

      param  : access struct_sched_param) return int;

   pragma Import (C, pthread_setschedparam, "pthread_setschedparam");

   function pthread_attr_setschedpolicy

     (attr   : access pthread_attr_t;

      policy : int) return int;

   pragma Import

     (C, pthread_attr_setschedpolicy, "pthread_attr_setschedpolicy");

   function sched_yield return int;

   pragma Import (C, sched_yield, "sched_yield");

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

   -- P1003.1c - Section 16 --

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

   function pthread_attr_init

     (attributes : access pthread_attr_t) return int;

   pragma Import (C, pthread_attr_init, "pthread_attr_init");

   function pthread_attr_destroy

     (attributes : access pthread_attr_t) return int;

   pragma Import (C, pthread_attr_destroy, "pthread_attr_destroy");

   function pthread_attr_setdetachstate

     (attr        : access pthread_attr_t;

      detachstate : int) return int;

   pragma Import

     (C, pthread_attr_setdetachstate, "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 Import (C, pthread_self, "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);

   pragma Convention (C, destructor_pointer);

   function pthread_key_create

     (key        : access pthread_key_t;

      destructor : destructor_pointer) return int;

   pragma Import (C, pthread_key_create, "pthread_key_create");

   CPU_SETSIZE : constant := 1_024;

   type bit_field is array (1 .. CPU_SETSIZE) of Boolean;

   for bit_field'Size use CPU_SETSIZE;

   pragma Pack (bit_field);

   pragma Convention (C, bit_field);

   type cpu_set_t is record

      bits : bit_field;

   end record;

   pragma Convention (C, cpu_set_t);

   function pthread_setaffinity_np

     (thread     : pthread_t;

      cpusetsize : size_t;

      cpuset     : access cpu_set_t) return int;

   pragma Import (C, pthread_setaffinity_np, "__gnat_pthread_setaffinity_np");

private

   type sigset_t is array (1 .. 4) of unsigned;

   --  In FreeBSD the component sa_handler turns out to

   --  be one a union type, and the selector is a macro:

   --  #define sa_handler __sigaction_u._handler

   --  #define sa_sigaction __sigaction_u._sigaction

   --  Should we add a signal_context type here ?

   --  How could it be done independent of the CPU architecture ?

   --  sigcontext type is opaque, so it is architecturally neutral.

   --  It is always passed as an access type, so define it as an empty record

   --  since the contents are not used anywhere.

   type struct_sigcontext is null record;

   pragma Convention (C, struct_sigcontext);

   type pid_t is new int;

   type time_t is new long;

   type timespec is record

      tv_sec  : time_t;

      tv_nsec : long;

   end record;

   pragma Convention (C, timespec);

   type pthread_attr_t is record

      detachstate   : int;

      schedpolicy   : int;

      schedparam    : struct_sched_param;

      inheritsched  : int;

      scope         : int;

      guardsize     : size_t;

      stackaddr_set : int;

      stackaddr     : System.Address;

      stacksize     : size_t;

   end record;

   pragma Convention (C, pthread_attr_t);

   type pthread_condattr_t is record

      dummy : int;

   end record;

   pragma Convention (C, pthread_condattr_t);

   type pthread_mutexattr_t is record

      mutexkind : int;

   end record;

   pragma Convention (C, pthread_mutexattr_t);

   type struct_pthread_fast_lock is record

      status   : long;

      spinlock : int;

   end record;

   pragma Convention (C, struct_pthread_fast_lock);

   type pthread_mutex_t is record

      m_reserved : int;

      m_count    : int;

      m_owner    : System.Address;

      m_kind     : int;

      m_lock     : struct_pthread_fast_lock;

   end record;

   pragma Convention (C, pthread_mutex_t);

   type pthread_cond_t is array (0 .. 47) of unsigned_char;

   pragma Convention (C, pthread_cond_t);

   type pthread_key_t is new unsigned;

end System.OS_Interface;