Device allocation reserves the use of a device to one user at a time. Devices that require a mount point must be mounted.
Device allocation must be enabled, as described in How to Make a Device Allocatable. If authorization is required, the user must have the authorization.
Allocate the device.
Specify the device by device name.
% allocate device-name |
Verify that the device is allocated.
Run the identical command.
% allocate device-name allocate. Device already allocated. |
In this example, the user jdoe allocates a microphone, audio.
% whoami jdoe % allocate audio |
In this example, a user allocates a printer. No one else can print to printer-1 until the user deallocates it, or until the printer is forcibly allocated to another user.
% allocate /dev/lp/printer-1 |
For an example of forcible deallocation, see Forcibly Deallocating a Device.
In this example, the user jdoe allocates a tape drive, st0.
% whoami jdoe % allocate st0 |
If the allocate command cannot allocate the device, an error message is displayed in the console window. For a list of allocation error messages, see the allocate(1) man page.
The user or role has allocated the device. To mount a device, the user or role must have the privileges that are required for mounting the device. To give the required privileges, see How to Authorize Users to Allocate a Device.
Assume a role that can allocate and mount a device.
% su - role-name Password: <Type role-name password> $ |
Create and protect a mount point in the role's home directory.
You only need to do this step the first time you need a mount point.
$ mkdir mount-point ; chmod 700 mount-point |
List the allocatable devices.
$ list_devices -l List of allocatable devices |
Allocate the device.
Specify the device by device name.
$ allocate device-name |
Mount the device.
$ mount -o ro -F filesystem-type device-path mount-point |
where
Indicates that the device is to be mounted read-only. Use-o rw to indicate that you should be able to write to the device.
Indicates the file system format of the device. Typically, a CD-ROM is formatted with an HSFS file system. A diskette is typically formatted with a PCFS file system.
Indicates the path to the device. The output of the list_devices -l command includes the device-path.
Indicates the mount point that you created in Step 2.
In this example, a user assumes a role that can allocate and mount a diskette drive, fd0. The diskette is formatted with a PCFS file system.
% roles devicealloc % su - devicealloc Password: <Type devicealloc password> $ mkdir /home/devicealloc/mymnt $ chmod 700 /home/devicealloc/mymnt $ list_devices -l ... device: fd0 type: fd files: /dev/diskette /dev/rdiskette /dev/fd0a ... $ allocate fd0 $ mount -o ro -F pcfs /dev/diskette /home/devicealloc/mymnt $ ls /home/devicealloc/mymnt List of the contents of diskette |
In this example, a user assumes a role that can allocate and mount a CD-ROM drive, sr0. The drive is formatted as an HSFS file system.
% roles devicealloc % su - devicealloc Password: <Type devicealloc password> $ mkdir /home/devicealloc/mymnt $ chmod 700 /home/devicealloc/mymnt $ list_devices -l ... device: sr0 type: sr files: /dev/sr0 /dev/rsr0 /dev/dsk/c0t2d0s0 ... ... $ allocate sr0 $ mount -o ro -F hsfs /dev/sr0 /home/devicealloc/mymnt $ cd /home/devicealloc/mymnt ; ls List of the contents of CD-ROM |
If the mount command cannot mount the device, an error message is displayed: mount: insufficient privileges. Check the following:
Make sure that you are executing the mount command in a profile shell. If you have assumed a role, the role has a profile shell. If you are a user who has been assigned a profile with the mount command, you must create a profile shell. The commands pfsh, pfksh, and pfcsh create a profile shell.
Make sure that you own the specified mount point. You should have read, write, and execute access to the mount point.
Contact your administrator if you still cannot mount the allocated device.
Deallocation enables other users to allocate and use the device when you are finished.
You must have allocated the device.
If the device is mounted, unmount the device.
$ cd $HOME $ umount mount-point |
Deallocate the device.
$ deallocate device-name |
In this example, the user jdoe deallocates the microphone, audio.
% whoami jdoe % deallocate audio |
In this example, the Device Allocator role deallocates a CD-ROM drive. After the message is printed, the CD-ROM is ejected.
$ whoami devicealloc $ cd /home/devicealloc $ umount /home/devicealloc/mymnt $ ls /home/devicealloc/mymnt $ $ deallocate sr0 /dev/sr0: 326o /dev/rsr0: 326o … sr_clean: Media in sr0 is ready. Please, label and store safely. |