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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.\" 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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.\" @(#)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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