1.\" $OpenBSD: mknod.2,v 1.10 2000/10/18 05:12:10 aaron 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. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)mknod.2 8.1 (Berkeley) 6/4/93 36.\" 37.Dd June 4, 1993 38.Dt MKNOD 2 39.Os 40.Sh NAME 41.Nm mknod 42.Nd make a special file node 43.Sh SYNOPSIS 44.Fd #include <sys/stat.h> 45.Ft int 46.Fn mknod "const char *path" "mode_t mode" "dev_t dev" 47.Sh DESCRIPTION 48The device special file 49.Fa path 50is created with the major and minor 51device numbers extracted from 52.Fa mode . 53The access permissions of 54.Fa path 55are descendant from the 56.Xr umask 2 57of the parent process. 58.Pp 59If 60.Fa mode 61indicates a block or character special file, 62.Fa dev 63is a configuration dependent specification of a character or block 64I/O device and the superblock of the device. 65If 66.Fa mode 67does not indicate a block special or character special device, 68.Fa dev 69is ignored. 70.Pp 71.Fn mknod 72requires superuser privileges. 73.Sh RETURN VALUES 74Upon successful completion a value of 0 is returned. 75Otherwise, a value of \-1 is returned and 76.Va errno 77is set to indicate the error. 78.Sh ERRORS 79.Fn mknod 80will fail and the file will be not created if: 81.Bl -tag -width Er 82.It Bq Er ENOTDIR 83A component of the path prefix is not a directory. 84.It Bq Er ENAMETOOLONG 85A component of a pathname exceeded 86.Dv {NAME_MAX} 87characters, or an entire path name exceeded 88.Dv {PATH_MAX} 89characters. 90.It Bq Er ENOENT 91A component of the path prefix does not exist. 92.It Bq Er EACCES 93Search permission is denied for a component of the path prefix. 94.It Bq Er ELOOP 95Too many symbolic links were encountered in translating the pathname. 96.It Bq Er EPERM 97The process's effective user ID is not superuser. 98.It Bq Er EIO 99An I/O error occurred while making the directory entry or allocating the inode. 100.It Bq Er ENOSPC 101The directory in which the entry for the new node is being placed 102cannot be extended because there is no space left on the file 103system containing the directory. 104.It Bq Er ENOSPC 105There are no free inodes on the file system on which the 106node is being created. 107.It Bq Er EDQUOT 108The directory in which the entry for the new node 109is being placed cannot be extended because the 110user's quota of disk blocks on the file system 111containing the directory has been exhausted. 112.It Bq Er EDQUOT 113The user's quota of inodes on the file system on 114which the node is being created has been exhausted. 115.It Bq Er EROFS 116The named file resides on a read-only file system. 117.It Bq Er EEXIST 118The named file exists. 119.It Bq Er EFAULT 120.Fa path 121points outside the process's allocated address space. 122.It Bq Er EINVAL 123The process is running within an alternate root directory, as 124created by 125.Xr chroot 2 . 126.El 127.Sh SEE ALSO 128.Xr chmod 2 , 129.Xr chroot 2 , 130.Xr stat 2 , 131.Xr umask 2 132.Sh HISTORY 133A 134.Fn mknod 135function call appeared in 136.At v6 . 137