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usbd.conf - usbd(8) configuration file


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The usbd.conf file is the configuration file for the usbd(8) daemon. It provides information to allow execution of userland commands on events reported by the usb(4) subsystem in the kernel. Currently the only events are device attach and detach, but could in the future be extended to include power management functions.

The configuration file consists of a sorted list of entries. Each entry describes a set of criteria commands. When an event occurs, the criteria are checked and if met, the commands for that event are executed through a shell. The list is sorted and scanned from top to bottom. The first matching entry is used for an event.

Each entry contains a number of fields. There are 3 types of fields: descriptive fields, selection criteria and commands to execute on events. The field names are case sensitive and should be all lower case. Each field can have one or more arguments.

The following fields are available:

device string Start a new entry. string is an arbitrary string used for pretty printing.
product id Product Id
vendor id Vendor Id
release id Release Id, also called revision Id sometimes.
class id Device Class
subclass id Device Subclass
protocol id Device Protocol
devname string Device name, for example umass2, or ums0. These device names can contain regular expressions. See regex(3) and re_format(7). The device name that is matched can be used in the commands below through adding ${DEVNAME} somewhere in that string.

String arguments may be quoted. If a string argument contains a space or tab character it needs to be enclosed in single or double quotes. If an argument contains a single or double quote, that quote needs to be enclosed in double or single quotes respectively. See below for examples.

Numeric arguments can either be specified in decimal (42), octal (052) or hexadecimal (0x2a).

The values for the fields product, vendor, release, class, subclass and protocol can be retrieved by killing the usbd daemon and running it with the -d and -v flags.

Commands to be executed when the action is matched:

attach string Shell command to execute when a device is attached.
detach string Shell command to execute when a device is detached.


The usbd configuration file.


A sample entry to rescan the SCSI bus on connection of a "Iomega USB Zip Drive":
device "USB Zip drive"
product 0x0001
vendor 0x059b
release 0x0100
attach "/usr/bin/camcontrol rescan 0"

To start up moused for a newly attached mouse:
device "Mouse"
devname "ums[0-9]+"
attach "/usr/sbin/moused -p /dev/${DEVNAME} -I /var/run/moused.${DEVNAME}.pid"


usb(4), usbd(8), usbdevs(8)



Created by Blin Media, 2008-2013