Re: zsocket help

["S. Cowles" <scowles@xxxxxxxx>]

thank you very much, peter.  and, yes, i _do_ have a purchased copy of 
your superb book.  cheers, sir.
sid


On Wed, 26 Sep 2007, Peter Stephenson wrote:

> Date: Wed, 26 Sep 2007 09:48:02 +0100
> From: Peter Stephenson <pws@xxxxxxx>
> To: zsh-users@xxxxxxxxxx
> Subject: Re: zsocket help
>
> "S. Cowles" wrote:
> > does anyone have a piece of sample code showing practical usage of
> > zsockets?  i'm not having success developing functioning zsocket code
> > using a current zsh cvs code pull.  i've been working from the zshall man
> > page and from the partial zsocket examples from zshlovers without success.
> > any help would be appreciated.  thanks.
>
> I got the following to work.
>
> In terminal A:
>
>  % typeset REPLY
>  % zmodload zsh/net/socket
>  % zsocket -l /tmp/zsocket
>  % print $REPLY
>  11
>  % zsocket -a 11
>
> This now blocks.  (I put the "typeset REPLY" at the start to ensure REPLY is
> created as a string, as you would naturally do in a function.)
>
> In terminal B:
>
>  % typeset REPLY
>  % zmodload zsh/net/socket
>  % zsocket /tmp/zsocket
>  % print $REPLY
>  3
>
> Terminal A returns at this point and I did:
>
>  % print $REPLY
>  3
>  % read -u3 && print $REPLY
>
> and in terminal B:
>
>  % print -u3 This is a message on the socket
>
> which produces in terminal A:
>
>  This is a message on the socket
>
> As far as I can see there's no way of closing the file descriptors using
> zsocket, which seems an omission.  Presumably you can use "exec 3>&-"
> etc. although to close a file descriptor over 9 you need to do something
> like:
>
>  % fd=11
>  % exec {fd}>&-
>
> --
> Peter Stephenson <pws@xxxxxxx>                  Software Engineer
> CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
> Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070