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-------------------------------------------------------------------------------
--- --
--- GNAT LIBRARY 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) 2002 Ada Core Technologies, Inc. --
--- --
--- 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 2, 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. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, 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. --
--- --
--- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com). --
--- --
-------------------------------------------------------------------------------
-
--- This is the default version. Used everywhere except 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 Fork return Process_Id;
- pragma Import (C, Fork, "__gnat_expect_fork");
- -- Starts a new process if possible.
- -- See the Unix command fork for more information. On systems that
- -- don't support this capability (Windows...), this command does
- -- nothing, and Fork will return Null_Pid.
-
- 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);
-
- -- Fork a new process
-
- Descriptor.Pid := Fork;
-
- -- Are we now in the child (or, for Windows, still in the common
- -- process).
-
- if Descriptor.Pid = Null_Pid then
-
- Command_With_Path := Locate_Exec_On_Path (Command);
-
- -- 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);
-
- Free (Command_With_Path);
- end if;
-
- -- Did we have an error when spawning the child ?
-
- if Descriptor.Pid < Null_Pid then
- null;
- 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;