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* Skill level: beginner
* Skill level: beginner
* Language: Python
* Language: Python
+
+=== Add support for checkpoint/restore of CORK-ed UDP socket ===
+'''Summary:''' Support C/R of corked UDP socket
+There's UDP_CORK option for sockets. As man page says:
+<pre>
+ If this option is enabled, then all data output on this socket
+ is accumulated into a single datagram that is transmitted when
+ the option is disabled. This option should not be used in
+ code intended to be portable.
+</pre>
+
+Currently criu refuses to dump this case, so it's effectively a bug. Supporting
+this will need extending the kernel API to allow criu read back the write queue
+of the socket (see [[TCP connection|how it's done]] for TCP sockets, for example). Then
+the queue is written into the image and is restored into the socket (with the CORK
+bit set too).
+'''Links:'''
+* https://github.com/checkpoint-restore/criu/issues/409
+* https://github.com/criupatchwork/criu/commit/a532312
+* [[Sockets]], [[TCP connection]]
+* [[https://groups.google.com/forum/#!topic/comp.os.linux.networking/Uz8PYiTCZSg UDP cork explained]]
+'''Details:'''
+* Skill level: intermediate (+linux kernel)
+* Language: C
+* Expected size: 350 hours
+* Mentors: Alexander Mikhalitsyn <alexander@mihalicyn.com>, Pavel Tikhomirov <ptikhomirov@virtuozzo.com>, Andrei Vagin <avagin@gmail.com>