gcc/ada/s-osinte-os2.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNU ADA 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) 1995-2004, Free Software Foundation, Inc.      --
  11 --                                                                          --
  12 -- GNARL 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 2,  or (at your option) any later ver- --
  15 -- sion. GNARL 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.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- As a special exception,  if other files  instantiate  generics from this --
  24 -- unit, or you link  this unit with other files  to produce an executable, --
  25 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  26 -- covered  by the  GNU  General  Public  License.  This exception does not --
  27 -- however invalidate  any other reasons why  the executable file  might be --
  28 -- covered by the  GNU Public License.                                      --
  29 --                                                                          --
  30 -- GNARL was developed by the GNARL team at Florida State University.       --
  31 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  32 --                                                                          --
  33 ------------------------------------------------------------------------------
  34
  35 --  This is the OS/2 version of this package
  36
  37 --  This package encapsulates all direct interfaces to OS services
  38 --  that are needed by children of System.
  39
  40 --  PLEASE DO NOT add any with-clauses to this package or remove the pragma
  41 --  Preelaborate. This package is designed to be a bottom-level (leaf) package.
  42
  43 with Interfaces.C;
  44
  45 package System.OS_Interface is
  46    pragma Preelaborate;
  47
  48    package C renames Interfaces.C;
  49
  50    subtype int            is C.int;
  51    subtype unsigned_long  is C.unsigned_long;
  52
  53    type Duration_In_Millisec is new C.long;
  54    --  New type to prevent confusing time functions in this package
  55    --  with time functions returning seconds or other units.
  56
  57    type Thread_Id is new unsigned_long;
  58
  59    -----------
  60    -- Errno --
  61    -----------
  62
  63    function errno return int;
  64    pragma Import (C, errno, "__get_errno");
  65
  66    EAGAIN   : constant := 5;
  67    EINTR    : constant := 13;
  68    EINVAL   : constant := 14;
  69    ENOMEM   : constant := 25;
  70
  71    -------------
  72    -- Signals --
  73    -------------
  74
  75    Max_Interrupt : constant := 15;
  76    type Signal is new int range 0 .. Max_Interrupt;
  77
  78    --  Signals for OS/2, only SIGTERM used currently. The values are
  79    --  fake, since OS/2 uses 32 bit exception numbers that cannot be
  80    --  used to index arrays etc. The GNULLI maps these Unix-like signals
  81    --  to OS/2 exception numbers.
  82
  83    --  SIGTERM is used for the abort interrupt.
  84
  85    SIGHUP     : constant := 1;  --  hangup
  86    SIGINT     : constant := 2;  --  interrupt (rubout)
  87    SIGQUIT    : constant := 3;  --  quit (ASCD FS)
  88    SIGILL     : constant := 4;  --  illegal instruction (not reset)
  89    SIGTRAP    : constant := 5;  --  trace trap (not reset)
  90    SIGIOT     : constant := 6;  --  IOT instruction
  91    SIGEMT     : constant := 0;  --  EMT instruction
  92    SIGFPE     : constant := 8;  --  floating point exception
  93    SIGKILL    : constant := 9;  --  kill (cannot be caught or ignored)
  94    SIGBUS     : constant := 10; --  bus error
  95    SIGSEGV    : constant := 11; --  segmentation violation
  96    SIGSYS     : constant := 12; --  bad argument to system call
  97    SIGPIPE    : constant := 13; --  write on a pipe with no one to read it
  98    SIGALRM    : constant := 14; --  alarm clock
  99    SIGTERM    : constant := 15; --  software termination signal from kill
 100
 101    subtype sigset_t is unsigned_long;
 102
 103    ----------
 104    -- Time --
 105    ----------
 106
 107    function Clock return Duration;
 108    pragma Inline (Clock);
 109    --  Clock measuring time since the epoch, which is the boot-time.
 110    --  The clock resolution is approximately 838 ns.
 111
 112    procedure Delay_For (Period : in Duration_In_Millisec);
 113    pragma Inline (Delay_For);
 114    --  Changed Sleep to Delay_For, for consistency with System.Time_Operations
 115
 116    ----------------
 117    -- Scheduling --
 118    ----------------
 119
 120    --  Put the calling task at the end of the ready queue for its priority
 121
 122    procedure Yield;
 123    pragma Inline (Yield);
 124
 125 end System.OS_Interface;