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.\"     @(#)mknod.2	8.1 (Berkeley) 6/4/93
.\"
.Dd July 3, 2011
.Dt MKNOD 2
.Os
.Sh NAME
.Nm mknod
.Nd make a special file node
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/stat.h
.Ft int
.Fn mknod "const char *path" "mode_t mode" "dev_t dev"
.Sh DESCRIPTION
The device special file
.Fa path
is created with the major and minor
device numbers specified by
.Fa dev .
The access permissions of
.Fa path
are extracted from
.Fa mode ,
modified by the
.Xr umask 2
of the parent process.
.Pp
.Fn mknod
requires super-user privileges.
.Sh RETURN VALUES
Upon successful completion a value of 0 is returned.
Otherwise, a value of \-1 is returned and
.Va errno
is set to indicate the error.
.Sh ERRORS
.Fn mknod
will fail and the file will be not created if:
.Bl -tag -width Er
.It Bq Er EACCES
Search permission is denied for a component of the path prefix.
.It Bq Er EDQUOT
The directory in which the entry for the new node
is being placed cannot be extended because the
user's quota of disk blocks on the file system
containing the directory has been exhausted; or
the user's quota of inodes on the file system on
which the node is being created has been exhausted.
.It Bq Er EEXIST
The named file exists.
.It Bq Er EFAULT
.Fa path
points outside the process's allocated address space.
.It Bq Er EINVAL
The supplied
.Fa mode
or
.Fa dev
is invalid.
.It Bq Er EIO
An I/O error occurred while making the directory entry or allocating the inode.
.It Bq Er ELOOP
Too many symbolic links were encountered in translating the pathname.
.It Bq Er ENAMETOOLONG
A component of a pathname exceeded
.Brq Dv NAME_MAX
characters, or an entire path name exceeded
.Brq Dv PATH_MAX
characters.
.It Bq Er ENOENT
A component of the path prefix does not exist.
.It Bq Er ENOSPC
The directory in which the entry for the new node is being placed
cannot be extended because there is no space left on the file
system containing the directory; or
there are no free inodes on the file system on which the
node is being created.
.It Bq Er ENOTDIR
A component of the path prefix is not a directory.
.It Bq Er EPERM
The process's effective user ID is not super-user.
.It Bq Er EROFS
The named file resides on a read-only file system.
.El
.Sh SEE ALSO
.Xr chmod 2 ,
.Xr mkfifo 2 ,
.Xr stat 2 ,
.Xr umask 2
.Sh HISTORY
A
.Fn mknod
function call appeared in
.At v6 .