From: Scott Cole <wsc@...>
Date: 2010-09-29T00:27:05+09:00
Subject: Re: TCP Socket: Connection reset, but Select says it's valid

Thanks for responding. I would expect to get some kind of EOF error on 
an EOF condition. Instead I see something like

error reading 'line' from #<TCPSocket:0x40e3f4>
Connection reset by peer (Errno::ECONNRESET)!

Selection is #<TCPSocket:0x40e3f4>



Brian Candler wrote:
> Scott Cole wrote:
>> I'm running a server that sometimes encounters a
>> connection-reset-by-peer error when reading data from a client. I'm
>> calling IO.Select to verify that there are characters to be read, but
>> occasionally the "rescue" below is activated when I do my gets.
> 
> Your code prints the exception class and message, what do you see?
>  I
>> presume this means the socket was closed after Select noticed there were
>> characters to be read but before I actually try to read them.
> 
> select returns true for an EOF-condition too. From `man 2 select`:
> 
>        Three  independent  sets of file descriptors are watched.  Those 
> listed
>        in readfds will be watched to see if characters  become 
> available  for
>        reading  (more  precisely, to see if a read will not block; in 
> particu‐
>        lar, a file descriptor is also ready on end-of-file)

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