-.TH UDEV 8 "October 2003" "" "Linux Programmer's Manual"
+.TH UDEV 8 "October 2003" "" "Linux Administrator's Manual"
.SH NAME
-udev \- Linux dynamic device naming support
+udev \- Linux configurable dynamic device naming support
.SH SYNOPSIS
.B udev
.SH "DESCRIPTION"
.B udev
-is a wonderful program whose man page has not been written yet.
+creates or removes device node files usually located in the /dev directory.
+As part of the
+.B hotplug
+subsystem,
+.B udev
+is exectuted if a kernel device is added or removed from the system.
+.P
+On device creation,
+.B udev
+reads the sysfs directory of the given device, to collect device attributes
+like label, serial number or bus device number.
+These attributes are passed as a key to the namedev subsystem
+to receive a unique name for device file creation.
+namedev maintains a database for devices present on the system.
+.P
+On device removal,
+.B udev
+queries the namedev database for the name of the device file to delete.
+.P
+namedev expects its configuration at
+.I /etc/udev/namedev.config.
+The file consists of a set of lines. All empty lines and
+lines beginning with a '#' will be ignored.
+.br
+Every line defines the mapping between device attributes and the device file
+name. It starts with a keyword defining the method used to match, followed by
+one ore more keys to compare, optional ownwership and permission settings and
+the filename for the device. If no matching configuration is found,
+the default kernel device name is used.
+.P
+.I method, key,[key,...] [owner,] [group,] [mode,] name
+.TP
+.B LABEL
+device label or serial number, like USB serial number, SCSI UUID or
+file system label
+.br
+keys: \fBBUS\fP, \fIsysfs_attribute\fP
+.TP
+.B NUMBER
+device number on the bus, like PCI bus id
+.br
+keys: \fBBUS\fP, \fBID\fP
+.TP
+.B TOPOLOGY
+device position on bus, like physical port of USB device
+.br
+keys: \fBBUS\fP, \fBPLACE\fP
+.TP
+.B REPLACE
+string replacement of the kernel device name
+.br
+key: \fBKERNEL_NAME\fP
+.TP
+.B CALLOUT
+calling external program, that returns a string to match
+.br
+keys: \fBBUS\fP, \fBPROGRAM\fP, \fBID\fP
+.SH "EXAMPLE"
+.nf
+# USB printer to be called lp_color
+LABEL, BUS="usb", serial="W09090207101241330", NAME="lp_color"
+
+# sound card with PCI bus id 00:0b.0 to be called dsp
+NUMBER, BUS="pci", ID="00:0b.0", NAME="dsp"
+
+# USB mouse at third port of the second hub to be called mouse1
+TOPOLOGY, BUS="usb", PLACE="2.3", NAME="mouse1"
+
+# ttyUSB1 should always be called pda
+REPLACE, KERNEL="ttyUSB1", NAME="pda"
+
+# if /sbin/dev_id returns "V0815" device will be called dev0815
+CALLOUT, PROGRAM="/sbin/dev_id", BUS="pci", ID="V0815", NAME="dev0815"
+.fi
.SH "FILES"
.nf
.ft B
.fi
.LP
.SH "SEE ALSO"
-.BR hotplug "(8)"
+.B hotplug (8)
.PP
The
.I http://linux-hotplug.sourceforge.net/
~ianmdlvl / elogind.git / blobdiff