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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [g-enblsp-vms-alpha.adb] - Rev 714
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------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- G N A T . E X P E C T . N O N _ B L O C K I N G _ S P A W N -- -- -- -- B o d y -- -- -- -- Copyright (C) 2005-2010, AdaCore -- -- -- -- GNAT 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 3, or (at your option) any later ver- -- -- sion. GNAT 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. -- -- -- -- As a special exception under Section 7 of GPL version 3, you are granted -- -- additional permissions described in the GCC Runtime Library Exception, -- -- version 3.1, as published by the Free Software Foundation. -- -- -- -- You should have received a copy of the GNU General Public License and -- -- a copy of the GCC Runtime Library Exception along with this program; -- -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- -- <http://www.gnu.org/licenses/>. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- This package provides a target dependent non-blocking spawn function -- for use by the VMS GNAT.Expect package (g-expect-vms.adb). This package -- should not be directly with'ed by an application program. -- This version is for Alpha/VMS separate (GNAT.Expect) procedure Non_Blocking_Spawn (Descriptor : out Process_Descriptor'Class; Command : String; Args : GNAT.OS_Lib.Argument_List; Buffer_Size : Natural := 4096; Err_To_Out : Boolean := False) is function Alloc_Vfork_Blocks return Integer; pragma Import (C, Alloc_Vfork_Blocks, "decc$$alloc_vfork_blocks"); function Get_Vfork_Jmpbuf return System.Address; pragma Import (C, Get_Vfork_Jmpbuf, "decc$$get_vfork_jmpbuf"); function Get_Current_Invo_Context (Addr : System.Address) return Process_Id; pragma Import (C, Get_Current_Invo_Context, "LIB$GET_CURRENT_INVO_CONTEXT"); Pipe1, Pipe2, Pipe3 : aliased Pipe_Type; Arg : String_Access; Arg_List : aliased array (1 .. Args'Length + 2) of System.Address; Command_With_Path : String_Access; begin -- Create the rest of the pipes Set_Up_Communications (Descriptor, Err_To_Out, Pipe1'Access, Pipe2'Access, Pipe3'Access); Command_With_Path := Locate_Exec_On_Path (Command); if Command_With_Path = null then raise Invalid_Process; end if; -- Fork a new process (it is not possible to do this in a subprogram) Descriptor.Pid := (if Alloc_Vfork_Blocks >= 0 then Get_Current_Invo_Context (Get_Vfork_Jmpbuf) else -1); -- Are we now in the child if Descriptor.Pid = Null_Pid then -- Prepare an array of arguments to pass to C Arg := new String (1 .. Command_With_Path'Length + 1); Arg (1 .. Command_With_Path'Length) := Command_With_Path.all; Arg (Arg'Last) := ASCII.NUL; Arg_List (1) := Arg.all'Address; for J in Args'Range loop Arg := new String (1 .. Args (J)'Length + 1); Arg (1 .. Args (J)'Length) := Args (J).all; Arg (Arg'Last) := ASCII.NUL; Arg_List (J + 2 - Args'First) := Arg.all'Address; end loop; Arg_List (Arg_List'Last) := System.Null_Address; -- This does not return on Unix systems Set_Up_Child_Communications (Descriptor, Pipe1, Pipe2, Pipe3, Command_With_Path.all, Arg_List'Address); end if; Free (Command_With_Path); -- Did we have an error when spawning the child ? if Descriptor.Pid < Null_Pid then raise Invalid_Process; else -- We are now in the parent process Set_Up_Parent_Communications (Descriptor, Pipe1, Pipe2, Pipe3); end if; -- Create the buffer Descriptor.Buffer_Size := Buffer_Size; if Buffer_Size /= 0 then Descriptor.Buffer := new String (1 .. Positive (Buffer_Size)); end if; end Non_Blocking_Spawn;
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