[PATCH v4 00/12] Allow registering only wakeup or block handler

[Pauli]

From: Pauli Nieminen <ext-pauli.nieminen at nokia.com>

And now I did reread the logic after night. I again found a serious bug that
could have resulted to NULL pointer call if not yet called block handlers would
be removed in handler. Solution is to check select deletion path depending on
if call has been already made.

I hope this version of the implementation doesn't have any more major bugs in
some corner cases like previous implementations. I probably should do these
after night self reviews before sending to list at first place.

I also added Alan's SOB to the 2nd patch.

I didn't add r-b because of fundamental change in the code. But here is list
of offered for previous version:
Reviewed-by: Adam Jackson <ajax at redhat.com>
Reviewed-by: Mark Kettenis <kettenis at openbsd.org>
Reviewed-by: Daniel Stone <daniel at fooishbar.org>

Pauli Nieminen (12):
  dix: Refactor block and wakup handlers
  doc: Update documentation to match the extended API
  udev: Don't register empty block handler
  dbus: Don't register empty block handler
  ephyr: Don't register empty wakeup handler
  kdrive/linux: Don't register empty block handler
  vfb: Don't register empty wakeup handler
  xfree86: Don't register empty block handler
  dmx: Don't register empty wakeup handler
  rootless: Don't register empty wakeup handler
  shadow: Don't register empty wakeup handler
  selinux: Don't register empty block handler

 Xext/xselinux_hooks.c           |   11 +--
 config/dbus-core.c              |    9 +--
 config/udev.c                   |    9 +--
 dix/dixutils.c                  |  226 ++++++++++++++++++++++++++-------------
 doc/xml/Xserver-spec.xml        |   42 +++++++-
 hw/dmx/dmxsync.c                |    9 +--
 hw/kdrive/ephyr/ephyr.c         |   14 +--
 hw/kdrive/linux/linux.c         |    9 +--
 hw/vfb/InitOutput.c             |   10 +--
 hw/xfree86/common/xf86Init.c    |    3 +-
 include/dix.h                   |   16 +++
 miext/rootless/rootlessScreen.c |   12 +--
 miext/shadow/shadow.c           |   11 +--
 13 files changed, 223 insertions(+), 158 deletions(-)