From: Roc Ho <hezepeng@...>
Date: 2008-07-03T18:43:05+09:00
Subject: Re: Detecting a connection loss && other network questions

1) you can check the recv msg  if msg==nil 
2) maybe the send msg must add "\0" at end


"David Leal" <dgleal@gmail.com> 写入邮件新闻:<928198f16881d4e14cef239836a9b3d1@ruby-forum.com>...
> Hello all,
> 
> I'm trying to get acquainted with network programming in Ruby and I'm
> facing several problems. The biggest 2 are
> 
> 1) How do I detect a connection loss when it happens while the client is
> blocking, waiting for data? According to Stevens, most tcp
> implementations time out after 11 minutes, but I disconnected my cable
> and waited long after that--nothing. Is this my fault? Is it a ruby
> problem?
> 
> 2) The client (an IRC bot) seems to be stuck sometimes. Suddenly, input
> stops, it stops logging data, everything stops. This happens on a
> particular IRC server (heinlein.freenode.net) in the middle of the MOTD,
> but happened a few days ago on another server during normal usage. The
> code I'm using is
> 
>   buffer = @socket.recvfrom(512).first
>   messages = buffer.split /\n/
> 
>   @messages.last << messages.shift \
>     if @messages.last && @messages.last[-1] != ?\r
> 
>   @messages += messages
> 
> An interesting twist is that this doesn't happen on heinlein upon
> connection if I print the contents of the array I get from recvfrom.
> Seems to be some kind of flushing problem, but I don't know enough about
> it to be sure.
> 
> Any ideas?
> 
> Cheers,
> 
> David
> -- 
> Posted via http://www.ruby-forum.com/.
>