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Linux supports two kinds of message queues: POSIX (i.e., those created by mq_open), and System V (i.e., those created by msgget). For POSIX message queues, mq_overview(7) documents that you can enumerate them via the mqueue virtual filesystem, usually mounted at /dev/mqueue. However, System V message queues don't show up there. How can I enumerate them?

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The proc virtual filesystem holds this information: /proc/sysvipc/msg is a file containing a list of all System V message queues. The ipcs program uses this file and shows you the same information, but in a more human-readable format.

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