119 lines
3.4 KiB
Groff
119 lines
3.4 KiB
Groff
.\" $NetBSD: getdevmajor.3,v 1.5 2009/03/24 22:34:54 drochner Exp $
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.\"
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.\" Copyright (c) 2004 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Andrew Brown.
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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. 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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.Dd January 20, 2009
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.Dt GETDEVMAJOR 3
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.Os
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.Sh NAME
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.Nm getdevmajor
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.Nd get block or character device major number
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In stdlib.h
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.In sys/stat.h
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.Ft devmajor_t
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.Fn getdevmajor "const char *name" "mode_t type"
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.Sh DESCRIPTION
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The
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.Fn getdevmajor
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function returns the major device number of the block or character
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device specified by
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.Ar name
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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
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.Dv S_IFBLK
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or
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.Dv S_IFCHR .
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.Sh RETURN VALUES
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If no device matches the specified values, no information is
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available, or an error occurs,
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.Dv NODEVMAJOR
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is returned and
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.Va errno
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is set to indicate the error.
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.Sh EXAMPLES
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To retrieve the major number for
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.Xr pty 4
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slave devices (aka pts devices):
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.Bd -literal -offset indent
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#include \*[Lt]stdlib.h\*[Gt]
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#include \*[Lt]sys/stat.h\*[Gt]
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.sp
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devmajor_t pts;
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pts = getdevmajor("pts", S_IFCHR);
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.Ed
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.Pp
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To retrieve the major numbers for the block and character
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.Xr wd 4
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devices:
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.Bd -literal -offset indent
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#include \*[Lt]stdlib.h\*[Gt]
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#include \*[Lt]sys/stat.h\*[Gt]
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.sp
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devmajor_t c, b;
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c = getdevmajor("wd", S_IFCHR);
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b = getdevmajor("wd", S_IFBLK);
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.Ed
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.Sh ERRORS
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The
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.Fn getdevmajor
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function may fail and set
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.Va errno
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for any of the errors specified for the library functions
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.Xr malloc 3
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and
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.Xr sysctlbyname 3 .
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In addition, the following errors may be reported:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The value of the
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.Fa type
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argument is not
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.Dv S_IFCHR
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or
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.Dv S_IFBLK .
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.It Bq Er ENOENT
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The named device is not found.
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.El
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.Sh SEE ALSO
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.Xr stat 2 ,
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.Xr devname 3 ,
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.Xr malloc 3 ,
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.Xr sysctlbyname 3
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.Sh HISTORY
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The
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.Fn getdevmajor
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function call appeared in
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.Nx 3.0 .
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