| CTOD(9) | Kernel Developer's Manual | CTOD(9) | 
ctod —
#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);
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.
| April 8, 2011 | NetBSD 10.0 |