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+.\" Copyright (C) 2001 Andries Brouwer <aeb@cwi.nl>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.TH getpagesize 2 2024-05-02 "Linux man-pages (unreleased)"
+.SH NAME
+getpagesize \- get memory page size
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <unistd.h>
+.P
+.B int getpagesize(void);
+.fi
+.P
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.P
+.BR getpagesize ():
+.nf
+    Since glibc 2.20:
+        _DEFAULT_SOURCE || ! (_POSIX_C_SOURCE >= 200112L)
+    glibc 2.12 to glibc 2.19:
+        _BSD_SOURCE || ! (_POSIX_C_SOURCE >= 200112L)
+    Before glibc 2.12:
+        _BSD_SOURCE || _XOPEN_SOURCE >= 500
+.\"        || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
+.fi
+.SH DESCRIPTION
+The function
+.BR 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
+.BR mmap (2).
+.SH VERSIONS
+A user program should not hard-code a page size,
+neither as a literal nor using the
+.B PAGE_SIZE
+macro,
+because some architectures support multiple page sizes.
+.P
+This manual page is in section 2 because
+Alpha, SPARC, and SPARC64
+all have a Linux system call
+.BR getpagesize ()
+though other architectures do not,
+and use the ELF auxiliary vector instead.
+.SH STANDARDS
+None.
+.SH HISTORY
+This call first appeared in 4.2BSD.
+SVr4, 4.4BSD, SUSv2.
+In SUSv2 the
+.BR getpagesize ()
+call was labeled LEGACY,
+and it was removed in POSIX.1-2001.
+.P
+glibc 2.0 returned a constant
+even on architectures with multiple page sizes.
+.SH SEE ALSO
+.BR mmap (2),
+.BR sysconf (3)