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Build # 1104

Build Type

push

travis-ci

Committed by xemul

Commit Message

SCM: Dump and restore SCM_RIGHTs

Most of the pieces has already been described in the previous patches :)
so here's the summary.

* Dump:

When receiving a message, also receive any SCM-s (already there) and when
SCM_RIGHTs one is met -- go ahead and just dump received descriptors using
regular code, but taking current as the victim task.

Few words about file paths resolution -- since we do dump path-ed files
by receiving them from victim's parasite, such files sent via sockets
should still work OK, as we still receive them, just from another socket.

Several problems here:

1. Unix sockets sent via unix sockets form knots. Not supported.
2. Eventpolls sent via unix might themseves poll unix sockets. Knots
   again. Not supported either.

* Restore:

On restore we need to make unix socket wait for the soon-to-be-scm-sent
descriptors to get restored, so we need to find them, then put a dependency.
After that, the fake fdinfo entry is attached to the respective file
descs, when sent the respective descriptors are closed.

For now more than one cmsg header in the message is not resotred. The
proper check for this must be in dump, but the plan is to support it
before master merege.

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

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