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Man Pages
GETPAGESIZE(3) FreeBSD Library Functions Manual GETPAGESIZE(3)

getpagesize
get system page size

Standard C Library (libc, -lc)

#include <unistd.h>
int
getpagesize(void);

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.

pagesize(1), sbrk(2)

The getpagesize() function appeared in 4.2BSD.
April 26, 2017 FreeBSD 12.0-RELEASE

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