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GETPAGESIZE(2) - man page online | system calls

Get memory page size.

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2014-08-19
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 allocation 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 architecture. 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 glibc 2.0 fails because its getpagesize() returns a statiā€ cally 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 4.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.
Linux 2014-08-19 GETPAGESIZE(2)
This manual Reference Other manuals
getpagesize(2) referred by mmap(2) | mmap2(2) | mremap(2) | numa(3) | pagesize(1) | posix_memalign(3) | procenv(1) | remap_file_pages(2) | syscalls(2)
refer to feature_test_macros(7) | mmap(2) | sysconf(3)