.\" $Id$
.TH MAKEDEV 8 "14th August 1994" Linux "Linux Programmer's Manual"
.SH NAME
MAKEDEV \- create devices
.SH SYNOPSIS
.B "cd dev; ./MAKEDEV -V"
.br
.B "cd dev; ./MAKEDEV [ -n ] [ -v ] update"
.br
.BI "cd dev; ./MAKEDEV [ -n ] [ -v ] [ -d ]" " device ..."
.SH DESCRIPTION
.B MAKEDEV
is a script that will create the devices in \fC/dev\fP used to interface
with drivers in the kernel.
.PP
This man page is woefully out of date.  A large number of devices are supported
that are not documented here.
.PP
Note that programs giving the error ``ENOENT: No such file or
directory'' normally means that the device file is missing, whereas
``ENODEV: No such device'' normally means the kernel does not have the
driver configured or loaded.
.SH OPTIONS
.TP
.B \-V
Print out version (actually RCS version information) and exit.
.TP
.B \-n
Do not actually update the devices, just print the actions that would be
performed.
.TP
.B \-d
Delete the devices.  The main use for this flag is by
.B MAKEDEV
itself.
.TP
.B \-v
Be verbose.  Print out the actions as they are performed.  This is the
same output as produced by
.BR \-n .
.SH CUSTOMISATION
Since there is currently no standardisation in what names are used for
system users and groups, it is possible that you may need to modify
.B MAKEDEV
to reflect your site's settings.  Near the top of the file is a mapping
from device type to user, group and permissions (e.g. all CD-ROM devices
are set from the \fC$cdrom\fP variable).  If you wish to change the
defaults, this is the section to edit.
.SH DEVICES
.TP
.B General Options
.TP
.B update
This only works on kernels which have \fC/proc/interrupts\fP (introduced
during 1.1.x).  This file is scanned to see what devices are currently
configured into the kernel, and this is compared with the previous
settings stored in the file called \fCDEVICES\fP.
Devices which are new since then or have a different major number are
created, and those which are no longer configured are deleted.
.TP
.B generic
Create a generic subset of devices.  This is the standard devices, plus
floppy drives, various hard drives, pseudo-terminals, console devices,
basic serial devices, busmice, and printer ports.
.TP
.B
std
Standard devices.
These are:
.B mem
\- acess to physical memory;
.B kmem
\- access to kernel virtual memory;
.B null
\- null device (infinite sink);
.B port
\- access to I/O ports;
.B zero
\- null byte source (infinite source);
.B core
\- symlink to /proc/kcore (for kernel debugging);
.B full
\- always returns ENOSPACE on write;
.B ram
\- ramdisk;
.B tty
\- to access the controlling tty of a process.
.TP 
.B local
This simply runs 
.BR MAKEDEV.local .
This is a script that can create any local devices.
.TP
.B Virtual Terminals
.TP
.I console
This creates the devices associated with the console.  This is the virtual
terminals
.RI tty x ,
where
.I x
can be from 0 though 63.  The device tty0 is the currently active vt, and
is also known as \fCconsole\fP.  For each vt, there are two devices
.RI vcs x
and
.RI vcsa x ,
which are used to generate screen-dumps of the vt (the
.BI vcs x
is just the text,
and
.BI vcsa x
includes the attributes).
.TP
.B Serial Devices
.TP
.I ttyS{0..63}
Serial ports and corresponding dialout device.  For device
.BI ttyS x ,
there is also the device
.BI cua x
which is used to dial out with.  This can avoid the need for cooperative
locks in simple situations.
.TP
.I cyclades
Dial-in and dial-out devices for the cyclades intelligent I/O serial card.
The dial in device is
.BI ttyC x
and the corresponding dial-out device is
.BI cub x 
Devices for 32 lines are created.
.TP
.B Pseudo Terminals
.TP
.I pty[p-s]
Each possible argument will create a bank of 16 master and slave
pairs.  The current kernel (1.2) is limited to 64 such pairs.
The master pseudo-terminals are 
.BR pty[p-s][0-9a-f] ,
and the slaves are
.BR tty[p-s][0-9a-f] .
.TP
.B Parallel Ports
.TP
.I lp
Standard parallel ports.  The devices are created 
.BR lp0 , 
.BR lp1 ,
and 
.BR lp2 .
These correspond to ports at 0x3bc, 0x378 and 0x278.
Hence, on some machines, the first printer port may actually be
.BR lp1 .
.TP
.I par
Alternative to
.IR lp .
Ports are named
.BI par x
instead of
.BI lp x .
.TP
.B Bus Mice
.TP
.I busmice
The various bus mice devices.  This creates the following devices:
.B logimouse
(Logitech bus mouse),
.B psmouse
(PS/2-style mouse),
.B msmouse
(Microsoft Inport bus mouse) and
.B atimouse
(ATI XL bus mouse) and
.B jmouse
(J-mouse).
.TP
.B Joystick Devices
.TP
.I js
Joystick.  Creates 
.B js0
and 
.BR js1 .
.TP
.B Disk Devices
.TP
.I fd[0-7]
Floppy disk devices.  The device
.BI fd x
is the device which autodetects the format, and the additional devices are
fixed format (whose size is indicated in the name).
The other devices are named as
.BI fd xLn .
The single letter
.I L
identifies the type of floppy disk (d = 5.25" DD, h = 5.25" HD, D = 3.5"
DD, H = 3.5" HD, E = 3.5" ED).  The number
.I n
represents the capacity of that format in K.  Thus the standard formats
are
.BI fd x d360 ,
.BI fd x h1200 ,
.BI fd x D720 ,
.BI fd x H1440 ,
and
.RI fd x E2880 .
.IP
For more information see Alain Knaff's fdutils package.
.IP
Devices
.BI fd0 *
through
.BI fd3 *
are floppy disks on the first controller, and devices
.BI fd4 *
through
.BI fd7 *
are floppy disks on the second controller.
.TP
.I hd[a-d]
AT hard disks.  The device
.BI hd x
provides access to the whole disk, with the partitions being
.BI hd x [0-20].
The four primary partitions are
.BI hd x 1
through
.BI hd x 4,
with the logical partitions being numbered from
.BI hd x 5
though
.BI hd x 20.
(A primary partition can be made into an extended partition, which can hold
4 logical partitions).
By default, only the devices for 4 logical partitions are made.  The
others can be made by uncommenting them.
.IP
Drives hda and hdb are the two on the first controller.  If using the new
IDE driver (rather than the old HD driver), then hdc and hdd are the two
drives on the secondary controller.  These devices can also be used to
acess IDE CDROMs if using the new IDE driver.
.TP
.I xd[a-d] 
XT hard disks.  Partitions are the same as IDE disks.
.TP
.I sd[a-h]
SCSI hard disks.  The partitions are similar to the IDE disks, but there
is a limit of 11 logical partitions
.RI (sd x 5
through
.RI sd x 15).
This is to allow there to be 8 SCSI disks.
.TP
.I loop
Loopback disk devices.  These allow you to use a regular file as a
block device.  This means that images of filesystems can be mounted,
and used as normal.  This creates 8 devices loop0 through loop7.
.TP
.B Tape Devices
.TP
.I st[0-7]
SCSI tapes.  This creates the rewinding tape device
.BI st x
and the non-rewinding tape device
.BI nst x .
.TP
.I qic
QIC-80 tapes.  The devices created are
.BR rmt8 ,
.BR rmt16 ,
.BR tape-d ,
and
.BR tape-reset .
.TP
.I ftape
Floppy driver tapes (QIC-117).  There are 4 methods of access depending on
the floppy tape drive.  For each of access methods 0, 1, 2 and 3, the
devices
.BI rft x
(rewinding) and
.BI nrft x
(non-rewinding) are created.  For compatability, devices
.B ftape
and
.B nftape
are symlinks to
.B rft0
and
.B nrft0
respectively.
.TP
.B CDROM Devices
.TP
.I scd[0-7]
SCSI CD players.
.TP
.I sonycd
Sony CDU-31A CD player.
.TP
.I mcd
Mitsumi CD player.
.TP
.I cdu535
Sony CDU-535 CD player.
.TP
.I lmscd
LMS/Philips CD player.
.TP
.I sbpcd{,1,2,3}
Sound Blaster CD player.  The kernel is capable of supporting 16 CDROMs,
each of which is accessed as
.BR sbpcd[0-9a-f] .
These are assigned in groups of 4 to each controller.
.B sbpcd
is a symlink to
.BR sbpcd0 .
.\" .TP
.\" .I idecd
.\" NEC CDR-260 (note: this will probably be obsoleted by the new IDE driver).
.TP
.B Scanner
.TP
.I logiscan
Logitech ScanMan32 & ScanMan 256.
.TP
.I m105scan
Mustek M105 Handscanner.
.TP
.I ac4096
A4Tek Color Handscanner.
.TP
.B Audio
.TP
.I audio
This creates the audio devices used by the sound driver.  These include
.BR mixer ,
.BR sequencer ,
.BR dsp ,
and
.BR audio .
.TP
.I pcaudio
Devices for the PC Speaker sound driver.  These are
.BR pcmixer .
.BR pxsp ,
and
.BR pcaudio .
.TP
.B Miscellaneous
.TP
.I sg
Generic SCSI devices.  The devices created are 
.B sg0 through 
.BR sg7 .
These
allow arbitary commands to be sent to any SCSI device.  This allows for
querying information about the device, or controlling SCSI devices that
are not one of disk, tape or CDROM (e.g. scanner, writeable CDROM).
.TP
.I fd
To allow an arbitary program to be fed input from file descriptor
.IR x ,
use
.BI /dev/fd/ x
as the file name.  This also creates 
BR /dev/stdin ,
BR /dev/stdout ,
and
BR /dev/stderr .
(Note, these are just symlinks into /proc/self/fd).
.TP
.I ibcs2
Devices (and symlinks) needed by the IBCS2 emulation.
.TP
.I apm
Devices for power management.
.TP
.I dcf
Driver for DCF-77 radio clock.
.TP
.I helloworld
Kernel modules demonstration device.  See the modules source.
.TP
.B "Network Devices"
Linux used to have devices in /dev for controlling network devices, but
that is no longer the case.  To see what network devices are known by the
kernel, look at /proc/net/dev.
.SH "SEE ALSO"
Linux Allocated Devices, maintained by H.\ Peter Anvin,
<Peter.Anvin@linux.org>.
.SH AUTHOR
Nick Holloway