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Mq serves a 9p file tree representing groups of buffered two-way datastreams for multiple readers and writers accessible through thestandard read(2) and write(2) file I/O interface.

Streams may be organized within an arbitrary file tree structure, whichprovides a means of namespacing and grouping.

<group><group>*<stream>*orderctl

A directory denotes a group of streams. Any number of streams andsub-groups may be created within a group. Grouped streams shareconfiguration and an order file.

The read-only meta-stream called order provides ordering information fordata written to streams within a group. Special readers such asmq-cat(1) can tap into this stream to retrieve data coming frommultiple streams in the same order it was written.

See themq(4) manual page for a completedescription of supported data modes, queue replay options, usage reference,and other details.

Mount themq(4) file server and use it to persist anrc(1) shell session.

mq -s detachmount -c /srv/detach /n/detachmkdir /n/detach/rccd /n/detach/rcecho replay all >ctltouch fd0 fd1 fd2rc -i <fd0 >>fd1 >>[2]fd2 &

Attach to the shell:

cat fd1 & cat fd2 & cat >>fd0

The programpin(1) provides a polished interface for persistingprogram sessions. It also makes use of the data ordering feature forfaithful reproduction of session history.

The programmq-cat(1) is an example of an ordered multi-stream reader.