.\"	$OpenBSD: dev_mkdb.8,v 1.8 2015/11/30 17:03:05 jmc Exp $
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.\"	from: @(#)dev_mkdb.8	8.1 (Berkeley) 6/6/93
.\"
.Dd $Mdocdate: November 30 2015 $
.Dt DEV_MKDB 8
.Os
.Sh NAME
.Nm dev_mkdb
.Nd create /dev database
.Sh SYNOPSIS
.Nm dev_mkdb
.Sh DESCRIPTION
The
.Nm
command creates a
.Xr hash 3
access method Berkeley database in
.Dq Pa /var/run/dev.db
which contains the names of all of the character and block special
files in the
.Dq Pa /dev
directory, using the file type and the
.Va st_rdev
field as the key.
.Pp
Keys are a structure containing a
.Tn mode_t
followed by a
.Tn dev_t ,
with any padding zeroed out.
The former is the type of the file
.Pq st_mode & S_IFMT ,
the latter is the
.Va st_rdev
field.
.Sh FILES
.Bl -tag -width /var/run/dev.db -compact
.It Pa /dev
device directory
.It Pa /var/run/dev.db
database file
.El
.Sh SEE ALSO
.Xr ps 1 ,
.Xr stat 2 ,
.Xr dbopen 3 ,
.Xr devname 3 ,
.Xr kvm_nlist 3 ,
.Xr ttyname 3 ,
.Xr kvm_mkdb 8
.Sh HISTORY
The
.Nm
command appeared in
.Bx 4.4 .