From: "Ara.T.Howard" <Ara.T.Howard@...>
Date: 2005-09-17T07:01:35+09:00
Subject: Re: sending EOF portably

On Sat, 17 Sep 2005, Robert Klemme wrote:

> Ara.T.Howard <Ara.T.Howard@noaa.gov> wrote:
>> any way to send EOF down a pipe/io object in a portable fashion?  i
>> want to signal EOF to another process w/o closing/reopen.
>
> There seems to be ETX, EOT, EM, FS... in ASCII but I dunno how portable that 
> is.
> http://www.lookuptables.com/

yeah... but you can't actually send those...

> If you control both processes you can use whatever convention you like.
> Other than that it'll be difficult.

i don't think i can - the input/output could be any binary data so no sequence
of chars will do.

> Btw, why do you want to do that?  A named pipe where you want to disconnect
> a listener but keep the pipe is about the only reasonable scenario that I
> can think of at the moment.

see my acgi posts.  right now i have to do

   open environment
   load environment
   close environment

   open stdin
   new cgi using redirected stdin
   close stdin

   open stdout
   open stderr
   redirect stdout
   redirect stderr
   yield cgi
   close stdout
   close stderr

basically i need to be able to do

   io.close
   io.clearerr
   io.read

in both reading/writing scenarios.  i'm working on a clearerr module now ;-)

cheers.

-a
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