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usbd - supervise USB attach/detach


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usbd [-c configfile] [-d] [-e] [-f device] [-n] [-t timeout] [-v]


The usbd utility handles USB device attachment and detachment. It does two things. Through opening the /dev/usb0, /dev/usb1, etc. devices, it enables the kernel to handle change requests from attached hubs. This functionality will be removed when the kernel has kernel threads. The (multiple) -f device command line options specify which controllers it should handle. Normally this option is not needed.

If the "usb", "ohci" and "uhci" modules are not loaded, usbd will load them automatically.

The second part is the handling of the attachment and detachment of USB devices. The device /dev/usb is opened and events are read from it. Whenever a device is attached or detached the list of actions read from /etc/usbd.conf is searched for a matching entry. If found, the corresponding action is executed.

The command line options are as follows:

-c filename
Name of configuration file. The default is /etc/usbd.conf.
-d Enable debugging to the standard output, and do not disassociate from the controlling terminal.
-e Do one device tree exploration, no event queue handling and then exit.
-f device
Specify the pathname of a USB controller device file. The flag may be repeated to watch more than one USB controller. The default is /dev/usb0 through /dev/usb3. Do not specify the device /dev/usb here. It is used for events only.
-n Do not handle the event queue on /dev/usb.
-t timeout
Set the timeout interval (in seconds) before an exploration happens without being triggered by a connect or disconnect. A timeout of 0 means that there is no timeout. The default is 30.
-v Be verbose. Repeating the flag makes usbd more verbose.




usb(4), usbd.conf(5)



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