1.\" Copyright (c) 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)devname.3 8.2 (Berkeley) 4/29/95 33.\" $FreeBSD: src/lib/libc/gen/devname.3,v 1.7.2.7 2003/03/15 15:11:05 trhodes Exp $ 34.\" $DragonFly: src/lib/libc/gen/devname.3,v 1.5 2007/05/17 08:19:00 swildner Exp $ 35.\" 36.Dd July 18, 1999 37.Dt DEVNAME 3 38.Os 39.Sh NAME 40.Nm devname , 41.Nm devname_r 42.Nd get device name 43.Sh LIBRARY 44.Lb libc 45.Sh SYNOPSIS 46.In sys/stat.h 47.In stdlib.h 48.Ft char * 49.Fn devname "dev_t dev" "mode_t type" 50.Ft char * 51.Fn devname_r "dev_t dev" "mode_t type" "char *buf" "size_t len" 52.Sh DESCRIPTION 53The 54.Fn devname 55function returns a pointer to the name of the block or character 56device in 57.Pa /dev 58with a device number of 59.Fa dev , 60and a file type matching the one encoded in 61.Fa type 62which must be one of 63.Dv S_IFBLK 64or 65.Dv S_IFCHR . 66To find the right name, 67.Fn devname 68first searches the device database created by 69.Xr dev_mkdb 8 ; 70if that fails, it will format the information encapsulated in 71.Fa dev 72and 73.Fa type 74in a human-readable format. 75.Pp 76.Fn devname 77returns a pointer to an internal static object; thus, subsequent calls will 78modify the same buffer. 79.Fn devname_r 80avoids this problem by taking a buffer and buffer length as arguments. 81.Sh SEE ALSO 82.Xr stat 2 , 83.Xr dev_mkdb 8 84.Sh HISTORY 85The 86.Fn devname 87function appeared in 88.Bx 4.4 . 89