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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 VxWorks 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 System.VxWorks;

package System.OS_Interface is

   pragma Preelaborate;

   subtype int        is Interfaces.C.int;

   subtype short      is Short_Integer;

   type long          is new Long_Integer;

   type unsigned_long is mod 2 ** long'Size;

   type size_t        is mod 2 ** Standard'Address_Size;

   -----------

   -- Errno --

   -----------

   function errno return int;

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

   EINTR     : constant := 4;

   EAGAIN    : constant := 35;

   ENOMEM    : constant := 12;

   EINVAL    : constant := 22;

   ETIMEDOUT : constant := 60;

   FUNC_ERR  : constant := -1;

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

   -- Signals and Interrupts --

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

   NSIG : constant := 32;

   --  Number of signals on the target OS

   type Signal is new int range 0 .. Interfaces.C."-" (NSIG, 1);

   Max_HW_Interrupt : constant := System.VxWorks.Num_HW_Interrupts - 1;

   type HW_Interrupt is new int range 0 .. Max_HW_Interrupt;

   Max_Interrupt : constant := Max_HW_Interrupt;

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

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

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

   SIGBUS  : constant := 10; --  bus error

   SIGSEGV : constant := 11; --  segmentation violation

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

   -- Signal processing definitions --

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

   --  The how in sigprocmask().

   SIG_BLOCK   : constant := 1;

   SIG_UNBLOCK : constant := 2;

   SIG_SETMASK : constant := 3;

   --  The sa_flags in struct sigaction.

   SA_SIGINFO   : constant := 16#0002#;

   SA_ONSTACK   : constant := 16#0004#;

   SIG_DFL : constant := 0;

   SIG_IGN : constant := 1;

   type sigset_t is private;

   type struct_sigaction is record

      sa_handler : System.Address;

      sa_mask    : sigset_t;

      sa_flags   : int;

   end record;

   pragma Convention (C, struct_sigaction);

   type struct_sigaction_ptr is access all struct_sigaction;

   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");

   function sigaction

     (sig  : Signal;

      act  : struct_sigaction_ptr;

      oact : struct_sigaction_ptr) return int;

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

   type isr_address is access procedure (sig : int);

   function c_signal (sig : Signal; handler : isr_address) return isr_address;

   pragma Import (C, c_signal, "signal");

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

   pragma Inline (sigwait);

   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, "sigprocmask");

   type t_id is new long;

   subtype Thread_Id is t_id;

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

   pragma Inline (kill);

   function getpid return t_id;

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

   --  VxWorks doesn't have getpid; taskIdSelf is the equivalent routine.

   ----------

   -- Time --

   ----------

   type time_t is new unsigned_long;

   type timespec is record

      ts_sec  : time_t;

      ts_nsec : long;

   end record;

   pragma Convention (C, timespec);

   type clockid_t is private;

   CLOCK_REALTIME : constant clockid_t;   --  System wide realtime clock

   function To_Duration (TS : timespec) return Duration;

   pragma Inline (To_Duration);

   function To_Timespec (D : Duration) return timespec;

   pragma Inline (To_Timespec);

   function To_Clock_Ticks (D : Duration) return int;

   --  Convert a duration value (in seconds) into clock ticks

   function clock_gettime

     (clock_id : clockid_t; tp : access timespec) return int;

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

   type ULONG is new unsigned_long;

   procedure tickSet (ticks : ULONG);

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

   function tickGet return ULONG;

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

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

   -- Utility Routines --

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

   function To_VxWorks_Priority (Priority : in int) return int;

   pragma Inline (To_VxWorks_Priority);

   --  Convenience routine to convert between VxWorks priority and Ada priority

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

   -- VxWorks specific API --

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

   subtype STATUS is int;

   --  Equivalent of the C type STATUS

   OK    : constant STATUS := 0;

   ERROR : constant STATUS := Interfaces.C.int (-1);

   function taskIdVerify (tid : t_id)  return STATUS;

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

   function taskIdSelf return t_id;

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

   function taskSuspend (tid : t_id) return int;

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

   function taskResume (tid : t_id) return int;

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

   function taskIsSuspended (tid : t_id) return int;

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

   function taskDelay (ticks : int) return int;

   procedure taskDelay (ticks : int);

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

   function sysClkRateGet return int;

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

   --  VxWorks 5.x specific functions

   function taskVarAdd

     (tid : t_id; pVar : access System.Address) return int;

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

   function taskVarDelete

     (tid : t_id; pVar : access System.Address) return int;

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

   function taskVarSet

     (tid   : t_id;

      pVar  : access System.Address;

      value : System.Address) return int;

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

   function taskVarGet

     (tid  : t_id;

      pVar : access System.Address) return int;

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

   --  VxWorks 6.x specific functions

   function tlsKeyCreate return int;

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

   function tlsValueGet (key : int) return System.Address;

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

   function tlsValueSet (key : int; value : System.Address) return STATUS;

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

   --  Option flags for taskSpawn

   VX_UNBREAKABLE    : constant := 16#0002#;

   VX_FP_PRIVATE_ENV : constant := 16#0080#;

   VX_NO_STACK_FILL  : constant := 16#0100#;

   function VX_FP_TASK return int;

   pragma Inline (VX_FP_TASK);

   function taskSpawn

     (name          : System.Address;  --  Pointer to task name

      priority      : int;

      options       : int;

      stacksize     : size_t;

      start_routine : System.Address;

      arg1          : System.Address;

      arg2          : int := 0;

      arg3          : int := 0;

      arg4          : int := 0;

      arg5          : int := 0;

      arg6          : int := 0;

      arg7          : int := 0;

      arg8          : int := 0;

      arg9          : int := 0;

      arg10         : int := 0) return t_id;

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

   procedure taskDelete (tid : t_id);

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

   function Set_Time_Slice (ticks : int) return int;

   pragma Inline (Set_Time_Slice);

   --  Calls kernelTimeSlice under VxWorks 5.x

   --  Do nothing under VxWorks 6.x

   function taskPriorityGet (tid : t_id; pPriority : access int) return int;

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

   function taskPrioritySet (tid : t_id; newPriority : int) return int;

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

   --  Semaphore creation flags

   SEM_Q_FIFO         : constant := 0;

   SEM_Q_PRIORITY     : constant := 1;

   SEM_DELETE_SAFE    : constant := 4;  -- only valid for binary semaphore

   SEM_INVERSION_SAFE : constant := 8;  -- only valid for binary semaphore

   --  Semaphore initial state flags

   SEM_EMPTY : constant := 0;

   SEM_FULL  : constant := 1;

   --  Semaphore take (semTake) time constants

   WAIT_FOREVER : constant := -1;

   NO_WAIT      : constant := 0;

   --  Error codes (errno). The lower level 16 bits are the error code, with

   --  the upper 16 bits representing the module number in which the error

   --  occurred. By convention, the module number is 0 for UNIX errors. VxWorks

   --  reserves module numbers 1-500, with the remaining module numbers being

   --  available for user applications.

   M_objLib                 : constant := 61 * 2**16;

   --  semTake() failure with ticks = NO_WAIT

   S_objLib_OBJ_UNAVAILABLE : constant := M_objLib + 2;

   --  semTake() timeout with ticks > NO_WAIT

   S_objLib_OBJ_TIMEOUT     : constant := M_objLib + 4;

   type SEM_ID is new System.Address;

   --  typedef struct semaphore *SEM_ID;

   --  We use two different kinds of VxWorks semaphores: mutex and binary

   --  semaphores. A null ID is returned when a semaphore cannot be created.

   function semBCreate (options : int; initial_state : int) return SEM_ID;

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

   --  Create a binary semaphore. Return ID, or 0 if memory could not

   --  be allocated.

   function semMCreate (options : int) return SEM_ID;

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

   function semDelete (Sem : SEM_ID) return int;

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

   --  Delete a semaphore

   function semGive (Sem : SEM_ID) return int;

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

   function semTake (Sem : SEM_ID; timeout : int) return int;

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

   --  Attempt to take binary semaphore.  Error is returned if operation

   --  times out

   function semFlush (SemID : SEM_ID) return STATUS;

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

   --  Release all threads blocked on the semaphore

private

   type sigset_t is new long;

   type pid_t is new int;

   ERROR_PID : constant pid_t := -1;

   type clockid_t is new int;

   CLOCK_REALTIME : constant clockid_t := 0;

end System.OS_Interface;