getpagesize man page on ElementaryOS

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GETPAGESIZE(2)		   Linux Programmer's Manual		GETPAGESIZE(2)

NAME
       getpagesize - get memory page size

SYNOPSIS
       #include <unistd.h>

       int getpagesize(void);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       getpagesize():
	   Since glibc 2.12:
	       _BSD_SOURCE ||
		   !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
	   Before glibc 2.12:
	       _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
	       _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED

DESCRIPTION
       The function getpagesize() returns the number  of  bytes	 in  a	memory
       page, where "page" is a fixed-length block, the unit for memory alloca‐
       tion and file mapping performed by mmap(2).

CONFORMING TO
       SVr4, 4.4BSD, SUSv2.   In  SUSv2	 the  getpagesize()  call  is  labeled
       LEGACY,	and  in	 POSIX.1-2001 it has been dropped; HP-UX does not have
       this call.

NOTES
       Portable applications should employ  sysconf(_SC_PAGESIZE)  instead  of
       getpagesize():

	   #include <unistd.h>
	   long sz = sysconf(_SC_PAGESIZE);

       (Most systems allow the synonym _SC_PAGE_SIZE for _SC_PAGESIZE.)

       Whether	getpagesize() is present as a Linux system call depends on the
       architecture.  If it is, it returns the kernel symbol PAGE_SIZE,	 whose
       value  depends  on  the architecture and machine model.	Generally, one
       uses binaries that are dependent on the architecture  but  not  on  the
       machine model, in order to have a single binary distribution per archi‐
       tecture.	 This means that a user program should not find	 PAGE_SIZE  at
       compile	time  from  a  header  file, but use an actual system call, at
       least for those architectures (like sun4) where this dependency exists.
       Here libc4, libc5, glibc 2.0 fail because their getpagesize() returns a
       statically derived value, and does not use a system call.   Things  are
       OK in glibc 2.1.

SEE ALSO
       mmap(2), sysconf(3)

COLOPHON
       This  page  is  part of release 3.54 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux				  2010-11-16			GETPAGESIZE(2)
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