[Eventmachine-talk] How to keep a pipe open

Roger Pack
2007-11-27T19:02:44Z

Maybe try it with a process where you can see what it receives more
easily?  Maybe the process is being interrupted...is your ruby program
terminating?
Take care.

On Nov 27, 2007 3:49 PM, Duane Johnson <canadaduane at gmail.com>
wrote:
> Hi all,
>
> I''ve been reading what I can from the list regarding
EventMachine::popen.
> The following two messages were helpful (for anyone else trying to use it):
>
> http://rubyforge.org/pipermail/eventmachine-talk/2007-June/000747.html
> http://rubyforge.org/pipermail/eventmachine-talk/2007-November/001227.html
>
> My question is this: How do I keep a pipe open for interactive-shell-type
> commands that "hang up"?
>
> I''m not sure I totally understand the mechanisms in place that are
causing
> this, so please feel free to chime in with obvious answers here.  As an
> example of the problem, take "TeX":
>
>
> EventMachine::run do
>   EventMachine::popen("tex -ipc", TexInstance)
> end
> This results in the following output (TexInstance simply forwards what it
> receives):
>
> received: This is TeX, Version 3.141592 (Web2C 7.5.6)
> received: **
> received: ! End of file on the terminal... why?
>
> This is the exact same message I receive if I start tex up and hit
"ctrl-d"
> on the keyboard... so by its appearance, it seems like my pipe is closing
> because tex is receiving an end-of-file character.
>
> Any ideas or workarounds?  Thanks!
>
> Duane Johnson
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>



--
-Roger Pack
For God hath not given us the spirit of fear; but of power, and of
love, and of a sound mind" -- 2 Timothy 1:7