tree ece41e20b54b46227a849ad007c4b85dddfaa14a
parent 48c86b2fd0f4ed5c18bc2a3ffceb9acefe60aaab
author Avery Pennarun <apenwarr@gmail.com> 1468387649 -0400
committer Avery Pennarun <apenwarr@gmail.com> 1468388349 -0400

gstatic: don't abort just because one host has a connect() failure.

If IPv4 or IPv6 was down, we might abort early and return neither result,
which was wrong.

While we're here, fix up various other error handling mistakes.  In
particular, don't perror() when errno==0, or you might get the dreaded
"Error: success" message.  Add an overall alarm() to handle any blocking
syscalls that never return.  Don't use exceptfd in select(), since readfd
covers all the interesting types of exceptions, and removing it removes the
need to check readfd, which we hadn't been doing.

Change-Id: I75e839b0608d51bfee5e2a31c9a1ce2e4ece1e23