diff options
Diffstat (limited to 'man2/getpagesize.2')
-rw-r--r-- | man2/getpagesize.2 | 89 |
1 files changed, 0 insertions, 89 deletions
diff --git a/man2/getpagesize.2 b/man2/getpagesize.2 deleted file mode 100644 index 25fcbcd..0000000 --- a/man2/getpagesize.2 +++ /dev/null @@ -1,89 +0,0 @@ -.\" Copyright (C) 2001 Andries Brouwer <aeb@cwi.nl> -.\" -.\" SPDX-License-Identifier: Linux-man-pages-copyleft -.\" -.TH getpagesize 2 2023-10-31 "Linux man-pages 6.7" -.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 STANDARDS -None. -.SH HISTORY -This call first appeared in 4.2BSD. -SVr4, 4.4BSD, SUSv2. -In SUSv2 the -.BR getpagesize () -call is labeled LEGACY, and in POSIX.1-2001 -it has been dropped; -HP-UX does not have this call. -.SH NOTES -Portable applications should employ -.I sysconf(_SC_PAGESIZE) -instead of -.BR getpagesize (): -.P -.in +4n -.EX -#include <unistd.h> -long sz = sysconf(_SC_PAGESIZE); -.EE -.in -.P -(Most systems allow the synonym -.B _SC_PAGE_SIZE -for -.BR _SC_PAGESIZE .) -.P -Whether -.BR getpagesize () -is present as a Linux system call depends on the architecture. -If it is, it returns the kernel symbol -.BR 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 -.B 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 -.BR getpagesize () -returns a statically derived value, and does not use a system call. -Things are OK in glibc 2.1. -.SH SEE ALSO -.BR mmap (2), -.BR sysconf (3) |