GETPAGESIZE(3)         FreeBSD 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.

FreeBSD 13.1-RELEASE-p6         April 26, 2017         FreeBSD 13.1-RELEASE-p6