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jlechner |
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- 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 --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 2005, AdaCore --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
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-- Boston, MA 02110-1301, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This package provides a target dependent non-blocking spawn function
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-- for use by the VMS GNAT.Expect package (g-expect-vms.adb). This package
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-- should not be directly with'ed by an application program.
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-- This version is for IA64/VMS
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separate (GNAT.Expect)
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procedure Non_Blocking_Spawn
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(Descriptor : out Process_Descriptor'Class;
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Command : String;
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Args : GNAT.OS_Lib.Argument_List;
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Buffer_Size : Natural := 4096;
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Err_To_Out : Boolean := False)
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is
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function Alloc_Vfork_Blocks return Integer;
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pragma Import (C, Alloc_Vfork_Blocks, "decc$$alloc_vfork_blocks");
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function Get_Vfork_Jmpbuf return System.Address;
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pragma Import (C, Get_Vfork_Jmpbuf, "decc$$get_vfork_jmpbuf");
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function Setjmp1 (Addr : System.Address) return Process_Id;
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pragma Import (C, Setjmp1, "decc$setjmp1");
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Pipe1, Pipe2, Pipe3 : aliased Pipe_Type;
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Arg : String_Access;
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Arg_List : aliased array (1 .. Args'Length + 2) of System.Address;
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Command_With_Path : String_Access;
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begin
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-- Create the rest of the pipes
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Set_Up_Communications
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(Descriptor, Err_To_Out, Pipe1'Access, Pipe2'Access, Pipe3'Access);
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Command_With_Path := Locate_Exec_On_Path (Command);
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if Command_With_Path = null then
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raise Invalid_Process;
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end if;
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-- Fork a new process (it is not possible to do this in a subprogram)
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if Alloc_Vfork_Blocks >= 0 then
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Descriptor.Pid := Setjmp1 (Get_Vfork_Jmpbuf);
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else
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Descriptor.Pid := -1;
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end if;
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-- Are we now in the child
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if Descriptor.Pid = Null_Pid then
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-- Prepare an array of arguments to pass to C
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Arg := new String (1 .. Command_With_Path'Length + 1);
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Arg (1 .. Command_With_Path'Length) := Command_With_Path.all;
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Arg (Arg'Last) := ASCII.Nul;
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Arg_List (1) := Arg.all'Address;
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for J in Args'Range loop
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Arg := new String (1 .. Args (J)'Length + 1);
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Arg (1 .. Args (J)'Length) := Args (J).all;
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Arg (Arg'Last) := ASCII.Nul;
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Arg_List (J + 2 - Args'First) := Arg.all'Address;
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end loop;
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Arg_List (Arg_List'Last) := System.Null_Address;
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-- This does not return on Unix systems
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Set_Up_Child_Communications
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(Descriptor, Pipe1, Pipe2, Pipe3, Command_With_Path.all,
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Arg_List'Address);
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end if;
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Free (Command_With_Path);
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-- Did we have an error when spawning the child ?
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if Descriptor.Pid < Null_Pid then
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raise Invalid_Process;
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else
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-- We are now in the parent process
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Set_Up_Parent_Communications (Descriptor, Pipe1, Pipe2, Pipe3);
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end if;
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-- Create the buffer
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Descriptor.Buffer_Size := Buffer_Size;
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if Buffer_Size /= 0 then
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Descriptor.Buffer := new String (1 .. Positive (Buffer_Size));
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end if;
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end Non_Blocking_Spawn;
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