how to find default OS block size?

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LEARN ABOUT NETBSD

getbsize

GETBSIZE(3)						   BSD Library Functions Manual 					       GETBSIZE(3)

NAME

     getbsize -- get user block size

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <stdlib.h>

     char *
     getbsize(int *headerlenp, long *blocksizep);

DESCRIPTION

     The getbsize function determines the user's preferred block size based on the value of the ``BLOCKSIZE'' environment variable; see environ(7)
     for details on its use and format.

     The getbsize function returns a pointer to a NUL terminated string describing the block size, something like ``1K-blocks''.  If the
     headerlenp parameter is not NULL the memory referenced by headerlenp is filled in with the length of the string (not including the terminat-
     ing NUL).	If the blocksizep parameter is not NULL the memory referenced by blocksizep is filled in with block size, in bytes.

     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.

SEE ALSO

     df(1), du(1), ls(1), systat(1), environ(7)

HISTORY

     The getbsize function first appeared in 4.4BSD.

BSD
								   May 30, 2003 							       BSD

UNIX for Advanced & Expert Users