dotcloud/docker — pull request #5511 by crosbymichael (2014-04-30 22:59:17+00:00)
Title: Refactor: remove statewriter type and all callback for process start

This is a small prereq. for the runtime ( foreground mode ) and brings libcontainer to act more like a proper lib.

From a commit:

This temp. expands the Exec method's signature but adds a more robust
way to know when the container's process is actually released and begins
to run. The network interfaces are not guaranteed to be up yet but this
provides a more accurate view with a single callback at this time.