win32utils devel - Nov 2004 - Forward from Laurent Julliard

Let''s try that again, without Hotmail''s crappy formatting.

Dan,

I am one of the developer of the FreeRIDE project (the Ruby IDE) and
I''m
in charge of the FreeRIDE debugger with which we have had a number of
problems on Windows now mostly due to the clunky implementation of
IO/Process/Signal stuff on Win32. I recently came across your Win32
utils package and investigated the use of win32 process as a replacement
for the native Ruby implementation. I currently have a problem which is
the following: Somewhere in my code I have this:

require ''win32/process''
command = "start CMD /K ruby -e ''while true { sleep 0.1;
}''"
@inp = @out = IO.popen(command,"w+") # this is the regular Ruby popen

#.... getting the pid of the ruby process (pid variable)
Process.waitpid(pid)
puts "Process stopped"

exit

When I run this code I always get the following error:

waitpid: no child process (Process::Win32::ProcessError)

I suspect that the reason for that is because the command I run actually
starts a CMD.exe program which in turn starts a ruby program.  The
waitpid call operates on the pid of the ruby program which is not the
child but the grand-child of the current process. If I use the standard
Ruby waitpid it works well. Do you see how I can solve this problem?
Shall I use Process.create with CREATE_NEW_CONSOLE flag instead of the
IO.popen method? Would this work better?  Any advice is welcome.

Thanks for your help

Laurent
--
Laurent JULLIARD
Xerox Global Services
Manager, Smart Document Engineering
Tel: +33 (0)4 76 61 50 48
Fax: +33 (0)4 76 61 51 99

Hi,
> Let''s try that again, without Hotmail''s crappy
formatting.
> 
> Dan,
> 
> I am one of the developer of the FreeRIDE project (the Ruby IDE) and
I''m
> in charge of the FreeRIDE debugger with which we have had a number of
> problems on Windows now mostly due to the clunky implementation of
> IO/Process/Signal stuff on Win32. I recently came across your Win32
> utils package and investigated the use of win32 process as a replacement
> for the native Ruby implementation. I currently have a problem which is
> the following: Somewhere in my code I have this:
> 
> require ''win32/process''
> command = "start CMD /K ruby -e ''while true { sleep 0.1;
}''"
> @inp = @out = IO.popen(command,"w+") # this is the regular Ruby
popen
> 
> #.... getting the pid of the ruby process (pid variable)
> Process.waitpid(pid)
> puts "Process stopped"
> 
> exit
> 
> When I run this code I always get the following error:
> 
> waitpid: no child process (Process::Win32::ProcessError)
> 
> I suspect that the reason for that is because the command I run actually
> starts a CMD.exe program which in turn starts a ruby program.  The
> waitpid call operates on the pid of the ruby program which is not the
> child but the grand-child of the current process. If I use the standard
> Ruby waitpid it works well. Do you see how I can solve this problem?
> Shall I use Process.create with CREATE_NEW_CONSOLE flag instead of the
> IO.popen method? Would this work better?  Any advice is welcome.
> 
> Thanks for your help
> 
> Laurent
> --
The Process.waitpid of Win32::Process is only usable for pids generated by
Win32::fork call.
Win32::Process handles it''s own array of pids not compatible with ruby
native array of pids.
So you cannot mix Win32::Process.wait and IO.popen.

Regards,

Park Heesob