[CRIU] [PATCH 00/19] files: Allow to send unix sockets

[Kirill Tkhai]

This patchset allow to send unix sockets over unix sockets.
The main thing, done in it, is plitting restore of unix
sockets in two stages, e.g., delay the time when receive
queue is restored. This solves the problem of circular
dependencies: when we have two stages, and the first stage
is independent of anything else, we may wait its finish in
the second stage. E.g., there is a standard scheme: 1)make
a fle is FLE_OPEN, and 2)everything else.

https://travis-ci.org/tkhai/criu/builds/335199619

---

Kirill Tkhai (19):
      zdtm: Add scm05 test
      files: Allow epolls sent over unix socket
      unix: Move post_open_unix_sk() to open_unixsk_standalone() and rename it
      files: Add force_master argument to collect_desc_fle()
      unix: Generalize get_fle_for_scm()
      sk-unix: Remove unused code in interconnected_pair()
      unix: Add fake interconnected sockets
      files: Export setup_and_serve_out()
      unix: Rework peer transfer in open_unixsk_pair_master()
      unix: Move queue restore of interconnected pair to post open
      unix: Make unix_sk_info::queuer pointer
      unix: Postpone restore_sk_common() of standalone sockets
      files: Implement find_unused_file_desc_id()
      unix: Split collect_one_unixsk()
      unix: Add fake queuer for standalone stream sockets in established state
      unix: Add fake queuer for standalone dgram sockets
      unix: Move dump_sk_queue() before peer resolution
      files: Allow to send unix sockets over unix sockets
      zdtm: Add scm06 test


 criu/cr-restore.c           |    4 
 criu/files.c                |   37 +++-
 criu/include/files.h        |    5 -
 criu/include/sockets.h      |    1 
 criu/sk-queue.c             |   10 -
 criu/sk-unix.c              |  386 +++++++++++++++++++++++++++++++------------
 test/zdtm/static/Makefile   |    2 
 test/zdtm/static/scm05.c    |  139 +++++++++++++++
 test/zdtm/static/scm06.c    |  122 ++++++++++++++
 test/zdtm/static/scm06.desc |    1 
 10 files changed, 583 insertions(+), 124 deletions(-)
 create mode 100644 test/zdtm/static/scm05.c
 create mode 100644 test/zdtm/static/scm06.c
 create mode 100644 test/zdtm/static/scm06.desc

--
Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>