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.\"     @(#)devname.3	8.2 (Berkeley) 4/29/95
.\" $FreeBSD: src/lib/libc/gen/devname.3,v 1.7.2.7 2003/03/15 15:11:05 trhodes Exp $
.\" $DragonFly: src/lib/libc/gen/devname.3,v 1.4 2004/01/06 15:38:09 eirikn Exp $
.\"
.Dd July 18, 1999
.Dt DEVNAME 3
.Os
.Sh NAME
.Nm devname ,
.Nm devname_r
.Nd get device name
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/stat.h
.In stdlib.h
.Ft char *
.Fn devname "dev_t dev" "mode_t type"
.Ft char *
.Fn devname_r "dev_t dev" "mode_t type" "char *buf" "size_t len"
.Sh DESCRIPTION
The
.Fn devname
function returns a pointer to the name of the block or character
device in
.Pa /dev
with a device number of
.Fa dev ,
and a file type matching the one encoded in
.Fa type
which must be one of
.Dv S_IFBLK
or
.Dv S_IFCHR .
To find the right name,
.Fn devname
first searches the device database created by
.Xr dev_mkdb 8 ;
if that fails, it will format the information encapsulated in
.Fa dev
and
.Fa type
in a human-readable format.
.Pp
.Fn devname
returns a pointer to an internal static object; thus, subsequent calls will
modify the same buffer.
.Fn devname_r
avoids this problem by taking a buffer and buffer length as argruments.
.Sh SEE ALSO
.Xr stat 2 ,
.Xr dev_mkdb 8
.Sh HISTORY
The
.Fn devname
function appeared in
.Bx 4.4 .