fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
183 lines
5.1 KiB
Groff
183 lines
5.1 KiB
Groff
.\" 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.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd January 16, 2011
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.Dt MKNOD 2
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.Os
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.Sh NAME
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.Nm mknod ,
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.Nm mknodat
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.Nd make a special file node
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/stat.h
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.Ft int
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.Fn mknod "const char *path" "mode_t mode" "dev_t dev"
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.Ft int
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.Fn mknodat "int fd" "const char *path" "mode_t mode" "dev_t dev"
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.Sh DESCRIPTION
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The file system node
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.Fa path
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is created with the file type and access permissions specified in
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.Fa mode .
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The access permissions are modified by the process's umask value.
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.Pp
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If
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.Fa mode
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indicates a block or character special file,
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.Fa dev
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is a configuration dependent specification denoting a particular device
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on the system.
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Otherwise,
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.Fa dev
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is ignored.
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.Pp
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The
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.Fn mknod
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system call
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requires super-user privileges.
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.Pp
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The
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.Fn mknodat
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system call is equivalent to
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.Fn mknod
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except in the case where
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.Fa path
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specifies a relative path.
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In this case the newly created device node is created relative to the
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directory associated with the file descriptor
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.Fa fd
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instead of the current working directory.
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If
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.Fn mknodat
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is passed the special value
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.Dv AT_FDCWD
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in the
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.Fa fd
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parameter, the current working directory is used and the behavior is
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identical to a call to
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.Fn mknod .
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.Sh RETURN VALUES
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.Rv -std mknod
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.Sh ERRORS
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The
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.Fn mknod
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system call
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will fail and the file will be not created if:
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.Bl -tag -width Er
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.It Bq Er ENOTDIR
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A component of the path prefix is not a directory.
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.It Bq Er ENAMETOOLONG
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A component of a pathname exceeded 255 characters,
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or an entire path name exceeded 1023 characters.
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.It Bq Er ENOENT
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A component of the path prefix does not exist.
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.It Bq Er EACCES
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Search permission is denied for a component of the path prefix.
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.It Bq Er ELOOP
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Too many symbolic links were encountered in translating the pathname.
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.It Bq Er EPERM
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The process's effective user ID is not super-user.
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.It Bq Er EIO
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An I/O error occurred while making the directory entry or allocating the inode.
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.It Bq Er ENOSPC
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The directory in which the entry for the new node is being placed
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cannot be extended because there is no space left on the file
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system containing the directory.
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.It Bq Er ENOSPC
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There are no free inodes on the file system on which the
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node is being created.
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.It Bq Er EDQUOT
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The directory in which the entry for the new node
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is being placed cannot be extended because the
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user's quota of disk blocks on the file system
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containing the directory has been exhausted.
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.It Bq Er EDQUOT
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The user's quota of inodes on the file system on
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which the node is being created has been exhausted.
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.It Bq Er EROFS
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The named file resides on a read-only file system.
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.It Bq Er EEXIST
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The named file exists.
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.It Bq Er EFAULT
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The
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.Fa path
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argument
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points outside the process's allocated address space.
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.It Bq Er EINVAL
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Creating anything else than a block or character special
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file (or a
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.Em whiteout )
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is not supported.
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.El
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.Pp
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In addition to the errors returned by the
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.Fn mknod ,
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the
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.Fn mknodat
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may fail if:
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.Bl -tag -width Er
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.It Bq Er EBADF
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The
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.Fa path
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argument does not specify an absolute path and the
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.Fa fd
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argument is neither
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.Dv AT_FDCWD
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nor a valid file descriptor open for searching.
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.It Bq Er ENOTDIR
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The
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.Fa path
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argument is not an absolute path and
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.Fa fd
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is neither
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.Dv AT_FDCWD
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nor a file descriptor associated with a directory.
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.El
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.Sh SEE ALSO
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.Xr chmod 2 ,
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.Xr mkfifo 2 ,
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.Xr stat 2 ,
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.Xr umask 2
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.Sh STANDARDS
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The
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.Fn mknodat
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system call follows The Open Group Extended API Set 2 specification.
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.Sh HISTORY
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The
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.Fn mknod
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function appeared in
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.At v6 .
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The
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.Fn mknodat
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system call appeared in
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.Fx 8.0 .
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