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mq(4) — message queue
Mq serves a 9p file tree representing groups of buffered two-way data
streams for multiple readers and writers accessible through the
standard read(2) and write(2) file I/O interface.
Streams may be organized within an arbitrary file tree structure, which
provides a means of namespacing and grouping.
A directory denotes a group of streams. Any number of streams and
sub-groups may be created within a group. Grouped streams share
configuration and an order file.
The read-only meta-stream called order provides ordering information for
data written to streams within a group. Special readers such as
`mq-cat(1)` can tap into this stream to retrieve data coming from
multiple streams in the same order it was written.
See the [`mq(4)`][mq] manual page for a complete
description of supported data modes, queue replay options, usage reference,
and other details.
Mount the `mq(4)` file server and use it to persist an `rc(1)` shell session.
mq -s detach
mount -c /srv/detach /n/detach
echo replay all >ctl
touch fd0 fd1 fd2
rc -i <fd0 >>fd1 >>fd2 &
Attach to the shell:
cat fd1 & cat fd2 & cat >>fd0
The program [`pin(1)`][pin] provides a polished interface for persisting
program sessions. It also makes use of the data ordering feature for
faithful reproduction of session history.
The program `mq-cat(1)` is an example of an ordered multi-stream reader.