GETPAGESIZE(3) NetBSD Library Functions Manual GETPAGESIZE(3)
getpagesize -- get system page size
Standard C Library (libc, -lc)
#include <unistd.h> int getpagesize(void);
This interface is obsoleted by sysconf(3). 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 under- lying hardware page size.
pagesize(1), sbrk(2), sysconf(3)
The getpagesize function call appeared in 4.2BSD. NetBSD 8.1 June 4, 1993 NetBSD 8.1
You can also request any man page by name and (optionally) by section: