tree faee1563c7e269b68972593f5d6235d7dff12062
parent 5bc52b2c9347120da7a72c42ae1f49bc441e72a9
author Barret Rhoden <brho@cs.berkeley.edu> 1513370433 -0500
committer Barret Rhoden <brho@cs.berkeley.edu> 1513795028 -0500

net: rock: Mirror F_SETFL flags to all FDs (XCC)

When the application attempts a fcntl + F_SETFL on a Rock FD (which is a
data FD), we'll mirror those commands to the other FDs (ctl and listen).

The motivator for this is dropbear, which sets a socket O_NONBLOCK and then
polls with connect().  It expects the O_NONBLOCK set on the socket FD to
apply to the entire socket.  Recall that all of the files that make up a
Rock collectively are a socket.

Back before commit 765fc2a8270a ("Remove the O_NONBLOCK fcntl() intercept
(XCC)"), we handled O_NONBLOCK in userspace.  This commit is somewhat
similar in that we need to do special Rock processing, but we still just do
fcntls.

Rebuild glibc.

Signed-off-by: Barret Rhoden <brho@cs.berkeley.edu>