Re: Trying not to miss any output from a PROCESS

In <OFD12EB947.123CC046-ONC1256FFF.003FD059-C1256FFF.00414304@mpsa.com>, [email protected] typed:
> Hello,
> 
> > Does anybody can explain me my mistake(s)/misunderstanding(s) ?
> 
> Yes. There are two things to consider.
> 
> 1- parallelism
> 
> Both processes work in parallel. It may be that the first read_line 
> returns nothing if the process did not have a chance to run yet.

That's really strange behavior. Typical behavior for read on a pipe is
to block until input is available, or an EOF occurs. While blocking
I/O isn't always what's wanted, it certainly solves this problem.

> Your loop should then look like:
> 
>         from
>                 p.output.read_line
>         until
>                 not p.output.is_connected
>         loop
>                 resultat.append(p.output.last_string)
>                 p.output.read_line
>         end

You mean the code to read data from a pipe is *different* than the
code to read data from a disk file? Yuch. That means I can't write
code that should work with either, which is something that command
line utilities *really* need to be able to do.

	<mike
-- 
Mike Meyer <[email protected]>		http://www.mired.org/consulting.html
Independent Network/Unix/Perforce consultant, email for more information.