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dtoc(9) [netbsd man page]

CTOD(9) 						   BSD Kernel Developer's Manual						   CTOD(9)

ctod -- macros related to bytes, pages, and disk blocks SYNOPSIS
#include <sys/param.h> size ctod(size x); size dtoc(size x); size ctob(size x); size btoc(size x); size dbtob(size x); size btodb(size x); DESCRIPTION
The ctod family of macros can be used to convert between bytes, pages (``clicks''), and disk blocks. The following table lists the possible conversions: Macro From To ctod() pages disk blocks dtoc() disk blocks pages ctob() pages bytes btoc() bytes pages dbtob() disk blocks bytes btodb() bytes disk blocks These are typical macros that may appear with different names in other operating systems. Examples include btop() and btopr() in Solaris. SEE ALSO
param(3) HISTORY
Some of these macros appeared in Version 7 AT&T UNIX. CAVEATS
The described macros make no assumptions about the type of the input parameter. A caller should ensure that neither integer overflow nor integer underflow are possible. BSD
April 8, 2011 BSD

Check Out this Related Man Page

PARAM(3)						   BSD Library Functions Manual 						  PARAM(3)

param -- common parameters SYNOPSIS
#include <sys/param.h> size MAX(size a, size b); size MIN(size a, size b); DESCRIPTION
The <sys/param.h> header includes some common definitions and macros specific to NetBSD. The header is perhaps best characterized as a ker- nel equivalent of <sys/types.h>. The following list summarizes the provided definitions and macros. o First and foremost, the header defines the version of NetBSD. This is defined as #define __NetBSD_Version__ 599004800 /* 5.99.48 */ The general format is ``MMmmrrpp00'', where 'MM' and 'mm' denote the major and minor version, respectively, 'rr' is provided for compatibility, and 'pp' defines the patch level. o Common utility macros such as MAX() and MIN() as well as more specific macros such as STACK(9), ctod(9), mstohz(9), roundup(9), and setbit(9). o Numerous miscellaneous definitions such as limits, constants for the kernel memoryallocators(9), scale factors used by the sched- uler, kthread(9) priorities, and many others. o Definitions provided for historical and compatibility reasons. Examples range from definitions such as ``#define BSD'' to old pri- ority levels used in the kernel. SEE ALSO
bitops(3), cdefs(3), types(3), unistd(3) HISTORY
A <param.h> header appeared already in the Version 4 AT&T UNIX. BSD
April 10, 2011 BSD
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