dbus: don't dispatch dbus events on select() EINTR

wakeup handlers are called even when select() returns EINTR,
and when they're called the passed fd set is undefined.

This commit fixes the dbus wakeup handler to avoid dispatching
into dbus spuriously.

Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Ray Strode <rstrode@redhat.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
selinux: don't checkout for AVCs on select() EINTR

wakeup handlers are called even when select() returns EINTR,
and when they're called the passed fd set is undefined.

This commit fixes the selinux wakeup handler to avoid checking
for AVCs over the netlink socket spuriously.

Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Ray Strode <rstrode@redhat.com>
Signed-off-by: Keith Packard <keithp@keithp.com>
os: Add -displayfd into -help text

Add -displayfd into -help text. It was mentioned in the man page but seem to have been missed from the -help text.

Signed-off-by: Keith Packard <keithp@keithp.com>