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man pages section 8: System Administration Commands

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Updated: Wednesday, July 27, 2022



rmmount - removable media mounter for CD-ROM, Jaz drive, and others


/usr/sbin/rmmount [-D]


The rmmount utility is a removable media mounter that is executed by volume management whenever a removable medium, such as a CD-ROM is inserted. Removable media is managed by an application or a volume manager. rmmount can also be called by using volrmmount(1).

Upon insertion of a medium and following invocation of the volcheck(1) command, rmmount determines what type of file system (if any) is on that medium. If a file system is present, rmmount mounts the file system in one of the locations listed below.

For a CD-ROM or a DVD-ROM:


symbolic link to mounted CD-ROM in local CD-ROM drive


mounted named CD-ROM


mounted named CD-ROM with partitioned file system


mounted unnamed CD-ROM

For a Zip drive:


symbolic link to mounted Zip medium in local Zip drive


mounted named Zip medium


mounted named Zip medium with partitioned file system


mounted unnamed Zip medium

For a Jaz drive:


symbolic link to mounted Jaz medium in local Jaz drive


mounted named Jaz medium


mounted named Jaz medium with partitioned file system


mounted unnamed Jaz medium

For a generic “rmdisk” drive:


symbolic link to mounted removable medium in local removable medium drive


mounted named removable medium


mounted named removable medium with partitioned file system


mounted unnamed removable medium

If the media is read-only (for example, a CD-ROM ), the file system is mounted read-only.

If a file system is not identified, rmmount does not mount a file system.

If a file system type has been determined, it is then checked to see that it is “clean.” If the file system is “dirty,” fsck –p (see fsck(8)) is run in an attempt to clean it. If fsck fails, the file system is mounted read-only.

After the mount is complete, “actions” associated with the media type are executed. These actions allow for the notification to other programs that new media are available.

Actions are executed in the order in which they appear in the configuration file. The action function can return either 1 or 0. If it returns 0, no further actions will be executed. This allows the function to control which applications are executed.

In order to execute an action, rmmount performs a dlopen(3C) on the shared object and calls the action function defined within it. The definition of the interface to actions can be found in /usr/include/rmmount.h.

File systems mounted by rmmount are always mounted with the nosuid flag set, thereby disabling setuid programs and access to block or character devices in that file system. Upon ejection, rmmount unmounts mounted file systems and executes actions associated with the media type. If a file system is “busy” (that is, it contains the current working directory of a live process), the ejection will fail.



Turn on the debugging output from the rmmount dprintf calls.



shared objects used by rmmount.


See attributes(7) for descriptions of the following attributes:


See Also

volcheck(1), volrmmount(1), dlopen(3C), attributes(7), fsck(8)