POSIX message queue file system
To link into kernel:
To load as a kernel loadable module:
module will permit the
kernel to support POSIX message queue. The
module contains system calls to manipulate POSIX message queues. It also
contains a file system to implement a view for all message queues of the
system. This helps users to keep track of their message queues and make it
more easily usable without having to invent additional tools.
The most common usage is as follows:
mount -t mqueuefs null
is a mount point.
It is possible to define an entry in
that looks similar to:
null /mnt/mqueue mqueuefs rw 0 0
This will mount
mount point during system boot.
as a permanent mount
point is not advised as its intention has always been to be a temporary mount
for more information on FreeBSD
Some common tools can be used on the file system, e.g.:
etc. To use only the message queue system calls, it is not necessary for user
to mount the file system, just load the module or compile it into the kernel.
Manually creating a file, for example, “
”, will create a message queue named
in the kernel, default message
queue attributes will be applied to the queue. It is not advised to use this
method to create a queue; it is better to use the
system call to create a queue as it allows the user to specify different
To see the queue's attributes, just read the file:
This manual page was written by David Xu