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 followed 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
       message.

       The  getbsize()  function  returns  a  pointer  to  a  null-terminated  string describing the block size,
       something like “1K-blocks”.  The memory referenced by headerlenp is filled in  with  the  length  of  the
       string (not including 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.

Debian                                          November 16, 2012                                 getbsize(3bsd)