Hopefully this version is an acceptable compromise to the comments thus far.


This patch enables TCP keepalives on VNC connections and TCP-based char
devices.

Changes v4 -> v5
- removed settings for the timers and counter such that OS defaults are
used once the keepalive option is enabled
- enabling keepalives is now an option for TCP char devices
(piggy-backed on the nodelay option Paul mentioned)
- forced on for vnc (making it an option for vnc is a big can of works
that does not need to be opened)

Signed-off-by: David Ahern <dsahern@gmail.com>


david