bsd man page for getpagesize

GETPAGESIZE(2)							System Calls Manual						    GETPAGESIZE(2)

NAME
       getpagesize - get system page size

SYNOPSIS
       pagesize = getpagesize()
       int pagesize;

DESCRIPTION
       Getpagesize returns the number of bytes in a page.  Page granularity is the granularity of many of the memory management calls.

       The page size is a system page size and may not be the same as the underlying hardware page size.

SEE ALSO
       sbrk(2), pagesize(1)

4.2 Berkeley Distribution					   May 15, 1985 						    GETPAGESIZE(2)