Section: Linux System Administrator's Manual (5)
Updated: 1 November 2002
makedev.d - configuration files for devices creation through makedev
The behavior of
is instrumented by the configuration files in
directory. They're read and "executed" by
on post installation of the MAKEDEV package.
These configuration file consists of a set of lines.
All empty lines, and all text on a line after a '#', will be ignored.
The remaining lines should all conform to one of the following formats:
This is a description of the four basic legal directives.
- =NAME expanded text
this define a macro. eg:
=BURNER 660 root cdwriter
- b mask owner group major minor minor_step dev_number root_name base
this directive define some
(``b'') device(s) creation. They will be owned by
and will have the
as major and minor numbers.
arguments define how many devices will be created. If
is different from 1, then
devices will be created, their minor number being incremented by
at each step.
If only one device is created, it will be named root_name. Else,
the devices will be named with regards to the following rules :
does not contains ``%d'', then ```%d'' is appended to its end.
is not set, it is initialized to zero.
Then, at each step, the name of the device we have to created is obtained
and replacing ``%d'' by base. This is equivament to these statements :
$base++; $file = sprintf($name, $base);
- c mask owner group major minor minor_step dev_number root_name base
is quite the same directive as the previous one, exept its purpose is
devices (``c'') creation.
- l destination source
Since there is currently no standardization in what names are used for
system users and groups, it is possible that you may need to modify
's configuration files to reflect your site's settings.
# /etc/makedev.d/test sample
# the following line create (```c'') the famous /dev/null entry
# with 666 mask (file access permissions), with 1 as major and
# 3 as minor
c 666 root root 1 3 1 1 null
# the following line define the STORAGE macro that specify a 660
# mask for file permissions, root as owner and disk as group
=STORAGE 660 root disk
# the following line create 16 /dev/hdaX entries (/dev/hda0 to
# /dev/hda15) with the permissions and ownership defined above,
# and with 22 as major
b $STORAGE 22 0 1 16 hda%d
# this one link /dev/snd on alsa entry in procfs
# (usually mounted in /proc)
l snd ../proc/asound/dev
The name of the file may contain some ``/
'' characters :
will create the necessary directories if the node to create must be
in a sub directory.
Comments must begin on first line character.
Files are parsed one by one, after having been sorted by name in alphabetical order.
files contains instructions that instrument
to create the device files in /dev. Especially,
define most frequently used macros.
Linux Allocated Devices, maintained by H. Peter Anvin,
It is ususally found in
if kernel-source package is installed
if kernel-doc package is installed. <VERSION> is the version number
of the installed kernel (eg: 2.4.19).
Thierry Vignaud <firstname.lastname@example.org
The device database is heavily inspirated by Redhat one.