minix/lib/libc/gen/getbsize.3
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

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Groff

.\" $NetBSD: getbsize.3,v 1.9 2003/08/07 16:42:48 agc Exp $
.\"
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.\" @(#)getbsize.3 8.1 (Berkeley) 6/4/93
.\"
.Dd May 30, 2003
.Dt GETBSIZE 3
.Os
.Sh NAME
.Nm getbsize
.Nd get user block size
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In stdlib.h
.Ft char *
.Fn getbsize "int *headerlenp" "long *blocksizep"
.Sh DESCRIPTION
The
.Nm getbsize
function determines the user's preferred block size based on the value of the
.Dq BLOCKSIZE
environment variable; see
.Xr environ 7
for details on its use and format.
.Pp
The
.Nm getbsize
function returns a pointer to a
.Dv NUL
terminated string describing
the block size, something like
.Dq 1K-blocks .
If the
.Fa headerlenp
parameter is not
.Dv NULL
the memory referenced by
.Fa headerlenp
is filled in with the length of the string (not including the
terminating
.Dv NUL ) .
If the
.Fa blocksizep
parameter is not
.Dv NULL
the memory referenced by
.Fa blocksizep
is filled in with block size, in bytes.
.Pp
If the user's block size is unreasonable, a warning message is
written to standard error and the returned information reflects
a block size of 512 bytes.
.Sh SEE ALSO
.Xr df 1 ,
.Xr du 1 ,
.Xr ls 1 ,
.Xr systat 1 ,
.Xr environ 7
.Sh HISTORY
The
.Nm getbsize
function first appeared in
.Bx 4.4 .