ultrix man page for getpagesize

getpagesize(2)							System Calls Manual						    getpagesize(2)

Name
       getpagesize - get system page size

Syntax
       pagesize = getpagesize()
       int pagesize;

Description
       The system call 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
       pagesize(1), sbrk(2)

																    getpagesize(2)