1.\" Copyright (c) 1980, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)mknod.2 8.1 (Berkeley) 06/04/93 7.\" 8.Dd 9.Dt MKNOD 2 10.Os BSD 4 11.Sh NAME 12.Nm mknod 13.Nd make a special file node 14.Sh SYNOPSIS 15.Fd #include <unistd.h> 16.Ft int 17.Fn mknod "const char *path" "mode_t mode" "dev_t dev" 18.Sh DESCRIPTION 19The device special file 20.Fa path 21is created with the major and minor 22device numbers extracted from 23.Fa mode. 24The access permissions of 25.Fa path 26are descendant from the 27.Xr umask 2 28of the parent process. 29.Pp 30If 31.Fa mode 32indicates a block or character special file, 33.Fa dev 34is a configuration dependent specification of a character or block 35I/O device and the superblock of the device. If 36.Fa mode 37does not indicate a block special or character special device, 38.Fa dev 39is ignored. 40.Pp 41.Fn Mknod 42requires super-user privileges. 43.Sh RETURN VALUES 44Upon successful completion a value of 0 is returned. 45Otherwise, a value of -1 is returned and 46.Va errno 47is set to indicate the error. 48.Sh ERRORS 49.Fn Mknod 50will fail and the file will be not created if: 51.Bl -tag -width Er 52.It Bq Er ENOTDIR 53A component of the path prefix is not a directory. 54.It Bq Er EINVAL 55The pathname contains a character with the high-order bit set. 56.It Bq Er ENAMETOOLONG 57A component of a pathname exceeded 255 characters, 58or an entire path name exceeded 1023 characters. 59.It Bq Er ENOENT 60A component of the path prefix does not exist. 61.It Bq Er EACCES 62Search permission is denied for a component of the path prefix. 63.It Bq Er ELOOP 64Too many symbolic links were encountered in translating the pathname. 65.It Bq Er EPERM 66The process's effective user ID is not super-user. 67.It Bq Er EPERM 68The pathname contains a character with the high-order bit set. 69.It Bq Er EIO 70An I/O error occurred while making the directory entry or allocating the inode. 71.It Bq Er ENOSPC 72The directory in which the entry for the new node is being placed 73cannot be extended because there is no space left on the file 74system containing the directory. 75.It Bq Er ENOSPC 76There are no free inodes on the file system on which the 77node is being created. 78.It Bq Er EDQUOT 79The directory in which the entry for the new node 80is being placed cannot be extended because the 81user's quota of disk blocks on the file system 82containing the directory has been exhausted. 83.It Bq Er EDQUOT 84The user's quota of inodes on the file system on 85which the node is being created has been exhausted. 86.It Bq Er EROFS 87The named file resides on a read-only file system. 88.It Bq Er EEXIST 89The named file exists. 90.It Bq Er EFAULT 91.Fa Path 92points outside the process's allocated address space. 93.El 94.Sh SEE ALSO 95.Xr chmod 2 , 96.Xr stat 2 , 97.Xr umask 2 98.Sh HISTORY 99A 100.Nm 101function call appeared in Version 6 AT&T UNIX. 102