The rmmount utility is a removable media mounter that is executed by volume management whenever a removable medium, such as a CD-ROM or a floppy, 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 diskette (floppy):
symbolic link to mounted floppy in local floppy drive
mounted named floppy
mounted unnamed floppy
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 or a floppy with write-protect tab set), the file system is mounted read-only.
If a file system is not identified, rmmount does not mount a file system. See the System Administration Guide: Basic Administration for more information on the location of CD-ROM, floppy, and other media without file systems.
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(1M)) 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.
See attributes(5) for descriptions of the following attributes: