From: zdohnal <zdohnal@redhat.com>
Date: Thu, 14 Dec 2023 16:33:40 +0000 (+0100)
Subject: httpAddrConnect2: Check for error if POLLHUP is in valid revents
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c9fe54b5c54db7f2e620fbb3d17a627b5393a76a;p=thirdparty%2Fcups.git

httpAddrConnect2: Check for error if POLLHUP is in valid revents

Some Linux kernel versions put POLLOUT|POLLHUP into revents when client tries to connect with httpAddrConnect2(), which makes the connection fail.
Let's check the option SO_ERROR before scratching the attempt - if there is no error, remove POLLHUP from revents.

I've re-purposed previously Solaris-only code to be used everywhere if the conditions are met - this should prevent bigger delays than necessary.

Slightly different issue than #827, but with similar symptoms (kernel sending POLLOUT|POLLHUP).
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c9fe54b5c54db7f2e620fbb3d17a627b5393a76a