UPDATE_DRV(8) Maintenance Procedures UPDATE_DRV(8)


update_drv - modify device driver attributes


update_drv [-f | -v] [-n] driver_module

update_drv [-b basedir] [-f | -v] [-n] -a [-m 'permission']
[-i 'identify-name'] [-P 'privilege'] [-p 'policy'] driver_module

update_drv [-b basedir] [-f | -v] [-n] -d [-m 'permission']
[-i 'identify-name'] [-P 'privilege'] [-p 'policy'] driver_module


The update_drv command informs the system about attribute changes to an
installed device driver. It can be used to re-read the driver.conf(5)
file, or to add, modify, or delete a driver's minor node permissions or

Without options, update_drv reloads the driver.conf file.

Upon successfully updating the aliases, the driver binding takes effect
upon reconfig boot or hotplug of the device.

Upon successfully updating the permissions, only the new driver minor
nodes get created with the modified set of file permissions. Existing
driver minor nodes do not get modified.


The following options are supported:


Add a permission, aliases, privilege or policy entry.

With the -a option specified, a permission entry (using the -m
option), or a driver's aliases entry (using the -i option), a device
privilege (using the -P option) or a a device policy (using the -p
option), can be added or updated. If a matching minor node
permissions entry is encountered (having the same driver name and the
minor node), it is replaced. If a matching aliases entry is
encountered (having a different driver name and the same alias), an
error is reported.

The -a and -d options are mutually exclusive.

-b basedir

Installs or modifies the driver on the system with a root directory
of basedir rather than installing on the system executing update_drv.

Note -

The root file system of any non-global zones must not be referenced
with the -b option. Doing so might damage the global zone's file
system, might compromise the security of the global zone, and might
damage the non-global zone's file system. See zones(7).


Delete a permission, aliases, privilege or policy entry.

The -m permission, -i identify-name, -P privilege or the -p policy
option needs to be specified with the -d option.

The -d and -a options are mutually exclusive.

If the entry doesn't exist update_drv returns an error.


Force the system to reread the driver.conf file even if the driver
module cannot be unloaded. See NOTES section for details.

Without this option, when removing an alias for a driver, update_drv
updates the binding files for the next boot, but returns an error if
one or more devices that reference the driver-alias binding remains.
With the -f option, update_drv does not return an error if such
devices remain.

-i 'identify-name'

A white-space separated list of aliases for the driver. If -a or -d
option is not specified then this option is ignored. The identify-
name string is mandatory. If all aliases need to be removed,
rem_drv(8) is recommended.

-m 'permission'

Specify a white-space separated list of file system permissions for
the device node of the device driver. If -a or -d option is not
specified then, this option is ignored. The permission string is


Do not try to load and attach device_driver, just modify the system
configuration files for that driver.

-p 'policy'

With the -a option, policy is a white-space separated list of
complete device policies. For the -d option, policy is a white space
separated list of minor device specifications. The minor device
specifications are matched exactly against the entries in
/etc/security/device_policy, that is, no wildcard matching is

-P 'privilege'

With the -a option, privilege is a comma separated list of additional
driver privileges. For the -d option, privilege is a single
privilege. The privileges are added to or removed from the
/etc/security/extra_privs file.




Example 1: Adding or Modifying an Existing Minor Permissions Entry

The following command adds or modifies the existing minor permissions
entry of the clone driver:

example# update_drv -a -m 'llc1 777 joe staff' clone

Example 2: Removing All Minor Permissions Entries

The following command removes all minor permission entries of the usbprn
driver, the USB printer driver:

example# update_drv -d -m '* 0666 root sys' usbprn

Example 3: Adding a Driver Aliases Entry

The following command adds a driver aliases entry of the ugen driver with
the identity string of usb459,20:

example# update_drv -a -i '"usb459,20"' ugen

Example 4: Re-reading the driver.conf File For the ohci Driver

The following command re-reads the driver.conf(5) file.

example# update_drv ohci

Example 5: Requiring a Self-defined Privilege to Open a tcp Socket

The following command requires a self-defined privilege to open a tcp

example# update_drv -a -P net_tcp -p \
'write_priv_set=net_tcp read_priv_set=net_tcp' tcp

Example 6: Establishing a Path-oriented Alias

The following command establishes a path-oriented alias to force a
specific driver, qlt, to be used for a particular device path:

example# update_drv -a -i '"/pci@8,600000/SUNW,qlc@4"' qlt


The following exit values are returned:


Successful completion.


An error occurred.


driver.conf(5), attributes(7), privileges(7), add_drv(8), modunload(8),


If -a or -d options are specified, update_drv does not reread the
driver.conf file.

A forced update of the driver.conf file reloads the driver.conf file
without reloading the driver binary module. In this case, devices which
cannot be detached reference driver global properties from the old
driver.conf file, while the remaining driver instances reference global
properties in the new driver.conf file.

It is possible to add an alias , which changes the driver binding of a
device already being managed by a different driver. A force update with
the -a option tries to bind to the new driver and report error if it
cannot. If you specify more than one of the -m, -i, -P or -p options, a
force flag tries to modify aliases or permissions. This is done even if
the other operation fails and vice-versa.

August 29, 2021 UPDATE_DRV(8)