fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
95 lines
3.0 KiB
Groff
95 lines
3.0 KiB
Groff
.\" 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. 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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.\" @(#)getbsize.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd November 16, 2012
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.Dt GETBSIZE 3
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.Os
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.Sh NAME
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.Nm getbsize
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.Nd get preferred block size
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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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.Ft char *
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.Fn getbsize "int *headerlenp" "long *blocksizep"
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.Sh DESCRIPTION
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The
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.Fn getbsize
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function returns a preferred block size for reporting by system utilities
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.Xr df 1 ,
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.Xr du 1 ,
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.Xr ls 1
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and
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.Xr systat 1 ,
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based on the value of the
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.Ev BLOCKSIZE
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environment variable.
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.Ev BLOCKSIZE
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may be specified directly in bytes, or in multiples of a kilobyte by
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specifying a number followed by ``K'' or ``k'', in multiples of a
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megabyte by specifying a number followed by ``M'' or ``m'' or in
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multiples of a gigabyte by specifying a number followed by ``G'' or
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``g''.
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Multiples must be integers.
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.Pp
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Valid values of
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.Ev BLOCKSIZE
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are 512 bytes to 1 gigabyte.
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Sizes less than 512 bytes are rounded up to 512 bytes, and sizes
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greater than 1 GB are rounded down to 1 GB.
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In each case
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.Fn getbsize
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produces a warning message.
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.Pp
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The
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.Fn getbsize
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function returns a pointer to a null-terminated string describing
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the block size, something like
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.Dq 1K-blocks .
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The memory referenced by
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.Fa headerlenp
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is filled in with the length of the string (not including the
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terminating null).
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The memory referenced by
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.Fa blocksizep
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is filled in with block size, in bytes.
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.Sh SEE ALSO
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.Xr df 1 ,
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.Xr du 1 ,
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.Xr ls 1 ,
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.Xr systat 1 ,
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.Xr environ 7
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.Sh HISTORY
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The
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.Fn getbsize
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function first appeared in
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.Bx 4.4 .
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