mongodb/mongo-c-driver — pull request #136 by hanumantmk (2014-12-15 19:19:34+00:00)
Title: Check for closed sockets before attempting a rpc

Ensure that the socket we've selected has been read from within a
second. If it hasn't, check if it's closed by polling for readability
and if that works, MSG_PEEK'ing a single byte. If we get eof, or an
error, we can assume it's broken. This lets us avoid a large class of
transient network failures.