1.\" Copyright (c) 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)getbsize.3 8.1 (Berkeley) 06/04/93 7.\" 8.Dd 9.Dt GETBSIZE 3 10.Os BSD 4.4 11.Sh NAME 12.Nm getbsize 13.Nd get user block size 14.Sh SYNOPSIS 15.Fd #include <stdlib.h> 16.Ft char * 17.Fn getbsize "int *headerlenp" "long *blocksizep" 18.Sh DESCRIPTION 19The 20.Nm getbsize 21function determines the user's preferred block size based on the value of the 22.Dq BLOCKSIZE 23environment variable; see 24.Xr environ 7 25for details on its use and format. 26.Pp 27The 28.Nm getbsize 29function returns a pointer to a null-terminated string describing 30the block size, something like 31.Dq 1K-blocks . 32The memory referenced by 33.Fa headerlenp 34is filled in with the length of the string (not including the 35terminating null). 36The memory referenced by 37.Fa blocksizep 38is filled in with block size, in bytes. 39.Pp 40If the user's block size is unreasonable, a warning message is 41written to standard error and the returned information reflects 42a block size of 512 bytes. 43.Sh SEE ALSO 44.Xr df 1 , 45.Xr du 1 , 46.Xr ls 1 , 47.Xr systat 1 , 48.Xr environ 7 49.Sh HISTORY 50The 51.Nm getbsize 52function call appeared in 53.Bx 4.4 . 54