.TH USBD 4
.SH NAME
usbd \- Universal Serial Bus daemon
.SH SYNOPSIS
.B usbd
[
.B -DfV
] [
.B -d
.I bitmask
] [
.B -u
root-hub-num
]
.SH DESCRIPTION
.I Usbd
manages the USB infrastructure, polls all ports, configures hubs and
provides access to USB devices through a file system in
.BR #U .
It monitors all ports, active or inactive and acts on state changes
by configuring devices when they are plugged in or turned on and
unconfiguring them when they are pulled out or switched off.
.PP
.B Usbd
recognizes the following options:
.TP
.B d
Set USB library debugging option
.IR bitmask .
A value of 1 sets
.BI Dbginfo ,
2 sets
.BI Dbgfs ,
4 sets
.BI Dbgproc ,
and 8 sets
.BI Dbgcontrol ;
they may be added to set multiple options.
.TP
.B D
Debug; print the bytes in each message sent or received.
.TP
.B f
Don't fork.
.TP
.B u
Specifies the controller number of the root hub.
.TP
.B V
Verbose; print configuration information and device status as they change.
.SH SOURCE
.B /sys/src/cmd/usb/usbd
.SH "SEE ALSO"
.IR usb (3),
.IR usb (4)