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Kernel Functions for Driversbtop(9F)

NAME

 btop - convert size in bytes to size in pages (round down)

SYNOPSIS

  
#include <sys/ddi.h>
unsigned long btop(unsigned long numbytes);

INTERFACE LEVEL

 

Architecture independent level 1 (DDI/DKI).

PARAMETERS

 
numbytes
Number of bytes.

DESCRIPTION

 

btop() returns the number of memory pages that are contained in the specified number of bytes, with downward rounding in the case that the byte count is not a page multiple. For example, if the page size is 2048, then btop(4096) returns 2, and btop(4097) returns 2 as well. btop(0) returns 0.

RETURN VALUES

 

The return value is always the number of pages. There are no invalid input values, and therefore no error return values.

CONTEXT

 

btop() can be called from user or interrupt context.

SEE ALSO

 

btopr(9F), ddi_btop(9F), ptob(9F)

Writing Device Drivers

SunOS 5.9Go To TopLast Changed 11 Apr 1991
 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.