On Tue, 28 Jan 2014, Jonathan Masters wrote:

> - Calls ssize_t result = send(fd,0,0,0), if result == -1, assume
> disconnected, if so send a message and remove the connection from the cache.

That's not very portable. As the man page for send(2) says on my Linux: "No
indication of failure to deliver is implicit in a send().".

... and then I don't even think there's a guarantee that sending 0 bytes would
even do the check you want.

I would rather suggest you instead check if the socket is readable, as closed
sockets become readable. That's also why we do it that way in libcurl already
(lib/url.c:SocketIsDead).

-- 
  / daniel.haxx.se
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