GETBSIZE(3) Library Functions Manual GETBSIZE(3)

getbsize — get user block size

#include <stdlib.h>

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

The () 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 () function returns a pointer to a NUL-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 NUL byte). The memory referenced by blocksizep is filled in with the 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.

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

The getbsize function first appeared in 4.4BSD.

June 5, 2013 OpenBSD 7.6