NAME
getbsize — get preferred block sizeLIBRARY
library “libbsd”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 theBLOCKSIZE
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.November 16, 2012 | Debian |