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Diffstat (limited to 'gcc/ada/g-enblsp.adb')
| -rw-r--r-- | gcc/ada/g-enblsp.adb | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/gcc/ada/g-enblsp.adb b/gcc/ada/g-enblsp.adb new file mode 100644 index 00000000000..cec401f3207 --- /dev/null +++ b/gcc/ada/g-enblsp.adb @@ -0,0 +1,117 @@ +------------------------------------------------------------------------------ +-- -- +-- 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 -- +-- -- +-- $Revision$ +-- -- +-- 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; |