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+.\"	$NetBSD: devname.3,v 1.17 2017/09/10 10:12:43 wiz Exp $
+.\"
+.\" Copyright (c) 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)devname.3	8.2 (Berkeley) 4/29/95
+.\"
+.Dd September 9, 2017
+.Dt DEVNAME 3
+.Os
+.Sh NAME
+.Nm devname ,
+.Nm devname_r
+.Nd get device name
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In stdlib.h
+.In sys/stat.h
+.Ft char *
+.Fn devname "dev_t dev" "mode_t type"
+.Ft int
+.Fn devname_r "dev_t dev" "mode_t type" "char *path" "size_t len"
+.Sh DESCRIPTION
+The
+.Fn devname
+function returns a pointer to the static buffer with the name of the
+block or character device in
+.Dq 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 S_IFBLK or S_IFCHR.
+If no device matches the specified values, or no information is
+available,
+.Dv NULL
+is returned.
+.Pp
+The
+.Fn devname_r
+function is a reentrant and thread-safe version of
+.Fn devname .
+This function returns the device name by copying it into the
+.Fa path
+argument with up to
+.Fa len
+characters.
+The
+.Fa path
+argument is always nul-terminated.
+.Pp
+The traditional display for applications when no device is
+found is the string
+.Dq ?? .
+.Sh RETURN VALUES
+If successful,
+.Fn devname
+returns a pointer to a nul-terminated string containing the name of the device.
+If an error occurs
+.Fa devname
+will return
+.Dv NULL .
+.Pp
+If successful,
+.Fn devname_r
+places a nul-terminated string containing the name of the device in
+the buffer pointed to by
+.Ar path
+and returns 0.
+If an error occurs
+.Fn devname_r
+will return an error number from
+.In sys/errno.h
+indicating what went wrong.
+.Sh FILES
+.Bl -tag -width /var/run/dev.cdb -compact
+.It Pa /var/run/dev.cdb
+Device database file.
+.El
+.Sh ERRORS
+The
+.Fn devname_r
+function may fail if:
+.Bl -tag -width Er
+.It Bq Er ENOENT
+The corresponding device does not exist.
+.It Bq Er ERANGE
+The passed buffer length is too short.
+.El
+.Sh SEE ALSO
+.Xr stat 2 ,
+.Xr dev_mkdb 8
+.Sh HISTORY
+The
+.Nm devname
+function call appeared in
+.Bx 4.4 .
+.Pp
+The
+.Fn devname_r
+function first appeared in
+.Nx 6.0 .