freebsd man page for getpagesize

GETPAGESIZE(3)						   BSD Library Functions Manual 					    GETPAGESIZE(3)

NAME
     getpagesize -- get system page size

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     int
     getpagesize(void);

DESCRIPTION
     The getpagesize() function 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)

HISTORY
     The getpagesize() function appeared in 4.2BSD.

BSD
								   June 4, 1993 							       BSD