1.\" $NetBSD: getdevmajor.3,v 1.6 2017/07/03 21:32:49 wiz Exp $ 2.\" 3.\" Copyright (c) 2004 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Andrew Brown. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. Neither the name of the University nor the names of its contributors 18.\" may be used to endorse or promote products derived from this software 19.\" without specific prior written permission. 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31.\" SUCH DAMAGE. 32.\" 33.Dd January 20, 2009 34.Dt GETDEVMAJOR 3 35.Os 36.Sh NAME 37.Nm getdevmajor 38.Nd get block or character device major number 39.Sh LIBRARY 40.Lb libc 41.Sh SYNOPSIS 42.In stdlib.h 43.In sys/stat.h 44.Ft devmajor_t 45.Fn getdevmajor "const char *name" "mode_t type" 46.Sh DESCRIPTION 47The 48.Fn getdevmajor 49function returns the major device number of the block or character 50device specified by 51.Ar name 52and a file type matching the one encoded in 53.Fa type 54which must be one of 55.Dv S_IFBLK 56or 57.Dv S_IFCHR . 58.Sh RETURN VALUES 59If no device matches the specified values, no information is 60available, or an error occurs, 61.Dv NODEVMAJOR 62is returned and 63.Va errno 64is set to indicate the error. 65.Sh EXAMPLES 66To retrieve the major number for 67.Xr pty 4 68slave devices (aka pts devices): 69.Bd -literal -offset indent 70#include <stdlib.h> 71#include <sys/stat.h> 72.sp 73devmajor_t pts; 74pts = getdevmajor("pts", S_IFCHR); 75.Ed 76.Pp 77To retrieve the major numbers for the block and character 78.Xr wd 4 79devices: 80.Bd -literal -offset indent 81#include <stdlib.h> 82#include <sys/stat.h> 83.sp 84devmajor_t c, b; 85c = getdevmajor("wd", S_IFCHR); 86b = getdevmajor("wd", S_IFBLK); 87.Ed 88.Sh ERRORS 89The 90.Fn getdevmajor 91function may fail and set 92.Va errno 93for any of the errors specified for the library functions 94.Xr malloc 3 95and 96.Xr sysctlbyname 3 . 97In addition, the following errors may be reported: 98.Bl -tag -width Er 99.It Bq Er EINVAL 100The value of the 101.Fa type 102argument is not 103.Dv S_IFCHR 104or 105.Dv S_IFBLK . 106.It Bq Er ENOENT 107The named device is not found. 108.El 109.Sh SEE ALSO 110.Xr stat 2 , 111.Xr devname 3 , 112.Xr malloc 3 , 113.Xr sysctlbyname 3 114.Sh HISTORY 115The 116.Fn getdevmajor 117function call appeared in 118.Nx 3.0 . 119