84 lines
2.9 KiB
Groff
84 lines
2.9 KiB
Groff
.\" $NetBSD: devname.3,v 1.7 2000/06/05 06:12:49 simonb Exp $
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.\"
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.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)devname.3 8.2 (Berkeley) 4/29/95
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.\"
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.Dd April 29, 1995
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.Dt DEVNAME 3
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.Os
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.Sh NAME
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.Nm devname
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.Nd get device name
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <stdlib.h>
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.Fd #include <sys/stat.h>
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.Ft char *
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.Fn devname "dev_t dev" "mode_t type"
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.Sh DESCRIPTION
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The
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.Fn devname
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function returns a pointer to the name of the block or character
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device in
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.Dq Pa /dev
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with a device number of
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.Fa dev ,
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and a file type matching the one encoded in
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.Fa type
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which must be one of S_IFBLK or S_IFCHR.
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The device name is cached so that multiple calls with the same
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.Fa dev
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and
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.Fa type
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do not require additional queries of the device database file.
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If no device matches the specified values, or no information is
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available, NULL is returned.
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.Pp
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The traditional display for applications when no device is
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found is the string
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.Dq ?? .
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.Sh FILES
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.Bl -tag -width /var/run/dev.db -compact
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.It Pa /var/run/dev.db
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Device database file.
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.El
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.Sh SEE ALSO
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.Xr stat 2 ,
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.Xr dev_mkdb 8
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.Sh HISTORY
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The
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.Nm devname
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function call appeared in
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.Bx 4.4 .
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