[PATCH v8 00/25] libxl: subprocess handling

[Ian Jackson <ian.jackson@eu.citrix.com>]

This incorporates changes from review.

These have already been acked, apart from 04/25, and could go into the
tree very soon:

  01/25 libxl: handle POLLERR, POLLHUP, POLLNVAL properly
  02/25 libxl: support multiple libxl__ev_fds for the same fd
  03/25 libxl: event API: new facilities for waiting for subprocesses
! 04/25 autoconf: trim the configure script; use autoheader
  05/25 autoconf: New test for openpty et al.
  06/25 libxl: provide libxl__remove_file et al.
  07/25 libxl: Introduce libxl__sendmsg_fds and libxl__recvmsg_fds
  08/25 libxl: Clean up setdefault in do_domain_create
  09/25 libxl: provide libxl__datacopier_*
  10/25 libxl: provide libxl__openpty_*
  11/25 libxl: ao: Convert libxl_run_bootloader
  12/25 libxl: make libxl_create_logfile const-correct
  13/25 libxl: log bootloader output
  14/25 libxl: Allow AO_GC and EGC_GC even if not used
  15/25 libxl: remove ctx->waitpid_instead

These are the remaining meat; all except 19/25 have been posted before
and some have been acked:
  
  16/25 libxl: change some structures to unit arrays
  17/25 libxl: ao: convert libxl__spawn_*
  18/25 libxl: make libxl_create run bootloader via callback
* 19/25 libxl: Fix an ao completion bug; document locking policy
  20/25 libxl: provide progress reporting for long-running operations
  21/25 libxl: remove malloc failure handling from NEW_EVENT
  22/25 libxl: convert console callback to libxl_asyncprogress_how
  23/25 libxl: clarify definition of "slow" operation
  24/25 libxl: child processes cleanups
  25/25 libxl: aborting bootloader invocation when domain dioes