100 lines
2.8 KiB
Groff
100 lines
2.8 KiB
Groff
.TH UDEV 8 "October 2003" "" "Linux Administrator's Manual"
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.SH NAME
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udev \- Linux configurable dynamic device naming support
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.SH SYNOPSIS
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.B udev
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.SH "DESCRIPTION"
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.B udev
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creates or removes device node files usually located in the /dev directory.
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As part of the
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.B hotplug
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subsystem,
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.B udev
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is exectuted if a kernel device is added or removed from the system.
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.P
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On device creation,
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.B udev
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reads the sysfs directory of the given device, to collect device attributes
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like label, serial number or bus device number.
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These attributes are passed as a key to the namedev subsystem
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to receive a unique name for device file creation.
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namedev maintains a database for devices present on the system.
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.P
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On device removal,
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.B udev
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queries the namedev database for the name of the device file to delete.
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.P
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namedev expects its configuration at
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.I /etc/udev/namedev.config.
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The file consists of a set of lines. All empty lines and
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lines beginning with a '#' will be ignored.
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.br
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Every line defines the mapping between device attributes and the device file
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name. It starts with a keyword defining the method used to match, followed by
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one ore more keys to compare, optional ownwership and permission settings and
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the filename for the device. If no matching configuration is found,
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the default kernel device name is used.
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.P
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.I method, key,[key,...] [owner,] [group,] [mode,] name
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.TP
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.B LABEL
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device label or serial number, like USB serial number, SCSI UUID or
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file system label
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.br
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keys: \fBBUS\fP, \fIsysfs_attribute\fP
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.TP
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.B NUMBER
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device number on the bus, like PCI bus id
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.br
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keys: \fBBUS\fP, \fBID\fP
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.TP
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.B TOPOLOGY
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device position on bus, like physical port of USB device
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.br
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keys: \fBBUS\fP, \fBPLACE\fP
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.TP
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.B REPLACE
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string replacement of the kernel device name
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.br
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key: \fBKERNEL_NAME\fP
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.TP
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.B CALLOUT
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calling external program, that returns a string to match
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.br
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keys: \fBBUS\fP, \fBPROGRAM\fP, \fBID\fP
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.SH "EXAMPLE"
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.nf
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# USB printer to be called lp_color
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LABEL, BUS="usb", serial="W09090207101241330", NAME="lp_color"
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# sound card with PCI bus id 00:0b.0 to be called dsp
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NUMBER, BUS="pci", ID="00:0b.0", NAME="dsp"
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# USB mouse at third port of the second hub to be called mouse1
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TOPOLOGY, BUS="usb", PLACE="2.3", NAME="mouse1"
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# ttyUSB1 should always be called pda
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REPLACE, KERNEL="ttyUSB1", NAME="pda"
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# if /sbin/dev_id returns "V0815" device will be called dev0815
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CALLOUT, PROGRAM="/sbin/dev_id", BUS="pci", ID="V0815", NAME="dev0815"
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.fi
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.SH "FILES"
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.nf
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.ft B
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.ft
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/sbin/udev udev program
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/etc/udev/* udev config and database files
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/etc/hotplug.d/default/udev.hotplug hotplug symlink to udev program
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.fi
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.LP
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.SH "SEE ALSO"
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.B hotplug (8)
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.PP
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The
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.I http://linux-hotplug.sourceforge.net/
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web site.
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.SH AUTHORS
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udev was developed by Greg Kroah-Hartman <greg@kroah.com> with much help from
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Dan Stekloff <dsteklof@us.ibm.com> and many others.
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