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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 IA64/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 Setjmp1 (Addr : System.Address) return Process_Id;
+ pragma Import (C, Setjmp1, "decc$setjmp1");
+
+ 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 Setjmp1 (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;