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This is needed for Send/Recieve to correctly handle borders between the messages. The framing uses a single 32bit uint32 length for each frame, of which the high bit is used to indicate whether the message contains a file descriptor or not. This is enough to separate out each message sent and to decide to which message each file descriptors belongs, even though multiple Sends may be coalesced into a single read, and/or one Send can be split into multiple writes. Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson) Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes) Upstream-commit: 24f9187a0467ca66c30e26c3d9e3ee58daeb720f Component: engine
pkg/ is a collection of utility packages used by the Docker project without being specific to its internals.
Utility packages are kept separate from the docker core codebase to keep it as small and concise as possible. If some utilities grow larger and their APIs stabilize, they may be moved to their own repository under the Docker organization, to facilitate re-use by other projects. However that is not the priority.
The directory pkg is named after the same directory in the camlistore project. Since Brad is a core
Go maintainer, we thought it made sense to copy his methods for organizing Go code :) Thanks Brad!
Because utility packages are small and neatly separated from the rest of the codebase, they are a good place to start for aspiring maintainers and contributors. Get in touch if you want to help maintain them!