getbsize(3bsd) LOCAL getbsize(3bsd)
NAME
getbsize — get preferred block size
LIBRARY
Utility functions from BSD systems (libbsd, -lbsd)
SYNOPSIS
#include <stdlib.h>
(See libbsd(7) for include usage.)
char *
getbsize(int *headerlenp, long *blocksizep);
DESCRIPTION
The getbsize() function returns a preferred block size for reporting by
system utilities df(1), du(1), ls(1) and systat(1), based on the value of
the BLOCKSIZE environment variable. BLOCKSIZE may be specified directly
in bytes, or in multiples of a kilobyte by specifying a number followed
by ``K'' or ``k'', in multiples of a megabyte by specifying a number fol-
lowed by ``M'' or ``m'' or in multiples of a gigabyte by specifying a
number followed by ``G'' or ``g''. Multiples must be integers.
Valid values of BLOCKSIZE are 512 bytes to 1 gigabyte. Sizes less than
512 bytes are rounded up to 512 bytes, and sizes greater than 1 GB are
rounded down to 1 GB. In each case getbsize() produces a warning mes-
sage.
The getbsize() function returns a pointer to a null-terminated string de-
scribing the block size, something like “1K-blocks”. The memory refer-
enced by headerlenp is filled in with the length of the string (not in-
cluding the terminating null). The memory referenced by blocksizep is
filled in with block size, in bytes.
SEE ALSO
df(1), du(1), ls(1), systat(1), environ(7)
HISTORY
The getbsize() function first appeared in 4.4BSD.
BSD November 16, 2012 BSD
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