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Re: socket-port



From: Takashi Kato <ktakashi@xxxxxxxxx>
Subject: Re: socket-port
Date: Tue, 18 Jun 2013 21:03:24 +0200

> I simply didn't consider non-R6RS implementations but if socket-ports
> returns 2 ports how could it be safely implemented? If the ports share
> the same socket descriptor then closing one port might cause SIGPIPE
> or something on the other port. (Might be too much detail but just
> popped up in my mind.)

Your logic is correct, so, in Gauche, closing one of the socket ports
does not close the socket descriptor (it does mark the Scheme-level
port structure as 'closed', and it does flush the output port).

I think returning a bidirectional port make things simpler.  Trade-off
is adoption of this srfi by implementations that doesn't have 
bidirectional ports.  I'm ambivalent now; it's not hard to add
bidirectional ports to Gauche (and if R7RS-large defines it, I sure will.)
So I don't object the current spec as is.  But I wonder what other
implementors do.

BTW, it hits me that the srfi may need to describe what happens to a
socket when you close the socket port, and what happens to a socket
port when the socket is closed.

--shiro