144 lines
4.1 KiB
Groff
144 lines
4.1 KiB
Groff
.\" $OpenBSD: mknod.8,v 1.22 2016/10/06 11:43:30 schwarze Exp $
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.\" $NetBSD: mknod.8,v 1.9 1995/08/10 23:47:32 jtc Exp $
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.\"
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)mknod.8 8.2 (Berkeley) 12/11/93
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.\"
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.Dd $Mdocdate: October 6 2016 $
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.Dt MKNOD 8
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.Os
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.Sh NAME
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.Nm mknod
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.Nd make device special files
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.Sh SYNOPSIS
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.Nm mknod
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.Op Fl m Ar mode
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.Ar name
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.Cm b Ns | Ns Cm c
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.Ar major minor
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.Nm mknod
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.Op Fl m Ar mode
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.Ar name
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.Cm p
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.Sh DESCRIPTION
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The
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.Nm
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command creates device special files.
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Normally the shell script
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.Pa /dev/MAKEDEV
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is used to create special files for commonly known devices; it executes
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.Nm
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with the appropriate arguments and can make all the files required for the
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device.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl m Ar mode
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Set the file permission bits of newly created device special files to
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.Ar mode .
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The mode argument can be in any of the formats specified to the
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.Xr chmod 1
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utility.
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If a symbolic mode is specified, the operators
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.Ql +
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and
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.Ql -
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are interpreted relative to an initial mode of
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.Dq a=rw .
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.El
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.Pp
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To make nodes manually, the arguments are:
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.Bl -tag -width majorx
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.It Ar name
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Device or FIFO name.
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For example
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.Dq sd
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for a SCSI disk or a
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.Dq pty
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for pseudo-devices.
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FIFOs may be named arbitrarily by the user.
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.It Cm b | c | p
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Type of device or FIFO.
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If the device is a block type device such as a tape or disk drive which needs
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both cooked and raw special files,
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the type is
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.Cm b .
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All other devices are character type devices, such as terminal
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and pseudo devices, and are type
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.Cm c .
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A FIFO (also known as a named pipe) is type
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.Cm p .
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.It Ar major
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The major device number is an integer number which tells the kernel
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which device driver entry point to use.
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To learn what major device number to use for a particular device,
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check the file
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.Pa /dev/MAKEDEV
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to see if the device is known.
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.It Ar minor
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The minor device number tells the kernel which subunit
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the node corresponds to on the device; for example,
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a subunit may be a filesystem partition
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or a tty line.
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.Pp
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Major and minor device numbers can be given in any format acceptable to
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.Xr strtoul 3 ,
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so that a leading
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.Dq 0x
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indicates a hexadecimal number, and a leading
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.Dq 0
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will cause the number to be interpreted as octal.
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.El
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.Sh SEE ALSO
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.Xr chmod 1 ,
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.Xr mkfifo 1 ,
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.Xr mkfifo 2 ,
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.Xr mknod 2 ,
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.Xr MAKEDEV 8
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.Sh STANDARDS
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As an extension,
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.Nm
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can also take multiple lists of parameters in one go.
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Note that
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.Fl m
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is not reset from one list to the next so, for example, in
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.Pp
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.Dl mknod -m 700 name b 12 5 name2 b 12 6
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.Pp
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both
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.Ar name
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and
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.Ar name2
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will be mode 700.
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v4 .
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