V10/man/man2/mknod.2

.TH MKNOD 2
.CT 2 sa
.SH NAME
mknod \(mi make a directory or a special file
.SH SYNOPSIS
.nf
.B int mknod(name, mode, addr)
.B char *name;
.nf
.SH DESCRIPTION
.I Mknod
creates a new file
whose name is the null-terminated string pointed
to by
.IR name .
The mode of the new file
(including directory and special file bits)
is initialized from
.IR mode .
(The protection part of the mode
is modified by the process's mode mask; see
.IR stat (2)
and
.IR umask (2)).
The first block pointer of the inode
is initialized from
.IR addr .
For ordinary files and directories
.I addr
is normally zero.
For a special file,
.I addr
is the device number;
see
.IR mknod (8)
and the writeups in section 4.
.PP
.I Mknod
may be invoked only by the super-user.
.SH "SEE ALSO"
.IR open (2)
for
.IR creat ,
.IR mkdir (2), 
.IR stat (2),
.IR umask (2),
.IR filsys (5),
.IR mknod (8)
.SH DIAGNOSTICS
.BR EEXIST ,
.BR EFAULT ,
.BR EIO ,
.BR ELOOP ,
.BR ENOENT ,
.BR ENOTDIR ,
.BR EPERM ,
.BR EROFS