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MQUEUEFS(5)		    BSD	File Formats Manual		   MQUEUEFS(5)

     mqueuefs -- POSIX message queue file system

     To	link into kernel:

	   options P1003_1B_MQUEUE

     To	load as	a kernel loadable module:

	   kldload mqueuefs

     The mqueuefs module will permit the FreeBSD kernel	to support POSIX mes-
     sage queue.  The module contains system calls to manipulate POSIX message
     queues.  It also contains a file system to	implement a view for all mes-
     sage queues of the	system.	 This helps users to keep track	of their mes-
     sage queues and make it more easily usable	without	having to invent addi-
     tional tools.

     The most common usage is as follows:

	   mount -t mqueuefs null /mnt/mqueue

     where /mnt/mqueue is a mount point.

     It	is possible to define an entry in /etc/fstab that looks	similar	to:

     null    /mnt/mqueue     mqueuefs	     rw	     0	     0

     This will mount mqueuefs at the /mnt/mqueue mount point during system
     boot.  Using /mnt/mqueue as a permanent mount point is not	advised	as its
     intention has always been to be a temporary mount point.  See hier(7) for
     more information on FreeBSD directory layout.

     Some common tools can be used on the file system, e.g.: cat(1), chmod(1),
     chown(8), ls(1), rm(1), etc.  To use only the message queue system	calls,
     it	is not necessary for user to mount the file system, just load the mod-
     ule or compile it into the	kernel.	 Manually creating a file, for exam-
     ple, "touch /mnt/mqueue/myqueue", will create a message queue named
     myqueue 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 mq_open(2) system call to create a queue as it al-
     lows the user to specify different	attributes.

     To	see the	queue's	attributes, just read the file:

	   cat /mnt/mqueue/myqueue

     mq_open(2), nmount(2), unmount(2),	mount(8), umount(8)

     This manual page was written by David Xu <>.

BSD			       November	30, 2005			   BSD


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