1.\" $OpenBSD: mknod.2,v 1.12 2007/05/31 19:19:33 jmc Exp $ 2.\" $NetBSD: mknod.2,v 1.6 1995/02/27 12:34:33 cgd Exp $ 3.\" 4.\" Copyright (c) 1980, 1991, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)mknod.2 8.1 (Berkeley) 6/4/93 32.\" 33.Dd $Mdocdate: May 31 2007 $ 34.Dt MKNOD 2 35.Os 36.Sh NAME 37.Nm mknod 38.Nd make a special file node 39.Sh SYNOPSIS 40.Fd #include <sys/stat.h> 41.Ft int 42.Fn mknod "const char *path" "mode_t mode" "dev_t dev" 43.Sh DESCRIPTION 44The device special file 45.Fa path 46is created with the major and minor 47device numbers extracted from 48.Fa mode . 49The access permissions of 50.Fa path 51are descendant from the 52.Xr umask 2 53of the parent process. 54.Pp 55If 56.Fa mode 57indicates a block or character special file, 58.Fa dev 59is a configuration dependent specification of a character or block 60I/O device and the superblock of the device. 61If 62.Fa mode 63does not indicate a block special or character special device, 64.Fa dev 65is ignored. 66.Pp 67.Fn mknod 68requires superuser privileges. 69.Sh RETURN VALUES 70Upon successful completion a value of 0 is returned. 71Otherwise, a value of \-1 is returned and 72.Va errno 73is set to indicate the error. 74.Sh ERRORS 75.Fn mknod 76will fail and the file will be not created if: 77.Bl -tag -width Er 78.It Bq Er ENOTDIR 79A component of the path prefix is not a directory. 80.It Bq Er ENAMETOOLONG 81A component of a pathname exceeded 82.Dv {NAME_MAX} 83characters, or an entire path name exceeded 84.Dv {PATH_MAX} 85characters. 86.It Bq Er ENOENT 87A component of the path prefix does not exist. 88.It Bq Er EACCES 89Search permission is denied for a component of the path prefix. 90.It Bq Er ELOOP 91Too many symbolic links were encountered in translating the pathname. 92.It Bq Er EPERM 93The process's effective user ID is not superuser. 94.It Bq Er EIO 95An I/O error occurred while making the directory entry or allocating the inode. 96.It Bq Er ENOSPC 97The directory in which the entry for the new node is being placed 98cannot be extended because there is no space left on the file 99system containing the directory. 100.It Bq Er ENOSPC 101There are no free inodes on the file system on which the 102node is being created. 103.It Bq Er EDQUOT 104The directory in which the entry for the new node 105is being placed cannot be extended because the 106user's quota of disk blocks on the file system 107containing the directory has been exhausted. 108.It Bq Er EDQUOT 109The user's quota of inodes on the file system on 110which the node is being created has been exhausted. 111.It Bq Er EROFS 112The named file resides on a read-only file system. 113.It Bq Er EEXIST 114The named file exists. 115.It Bq Er EFAULT 116.Fa path 117points outside the process's allocated address space. 118.It Bq Er EINVAL 119The process is running within an alternate root directory, as 120created by 121.Xr chroot 2 . 122.El 123.Sh SEE ALSO 124.Xr chmod 2 , 125.Xr chroot 2 , 126.Xr stat 2 , 127.Xr umask 2 128.Sh HISTORY 129A 130.Fn mknod 131function call appeared in 132.At v6 . 133