tree b73263c00172dd6d38fb8abba3febd3a70ff5637
parent 85d2ba6b78f12939ecaf8f3dcad8a693da1c8b66
author Willy Tarreau <w@1wt.eu> 1602603965 +0200
committer Willy Tarreau <w@1wt.eu> 1602605733 +0200
encoding latin1

BUG/MINOR: listener: detect and handle shared sockets stopped in other processes

It may happen that during a temporary listener pause resulting from a
SIGTTOU, one process gets one of its sockets disabled by another process
and will not be able to recover from this situation by itself. For the
protocols supporting this (TCPv4 and TCPv6 at the moment) this situation
is detectable, so when this happens, let's put the listener into the
PAUSED state so that it remains consistent with the real socket state.
One nice effect is that just sending the SIGTTIN signal to the process
is enough to recover the socket in this case.

There is no need to backport this, this behavior has been there forever
and the fix requires to reimplement the getsockopt() call there.