82 lines
3.5 KiB
C
82 lines
3.5 KiB
C
/* Definitions for BSD-style memory management.
|
|
Copyright (C) 1994-1998, 2000 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
/* These are the bits used by 4.4 BSD and its derivatives. On systems
|
|
(such as GNU) where these facilities are not system services but can be
|
|
emulated in the C library, these are the definitions we emulate. */
|
|
|
|
#ifndef _SYS_MMAN_H
|
|
# error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
|
|
#endif
|
|
|
|
/* Protections are chosen from these bits, OR'd together. The
|
|
implementation does not necessarily support PROT_EXEC or PROT_WRITE
|
|
without PROT_READ. The only guarantees are that no writing will be
|
|
allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
|
|
|
|
#define PROT_NONE 0x00 /* No access. */
|
|
#define PROT_READ 0x04 /* Pages can be read. */
|
|
#define PROT_WRITE 0x02 /* Pages can be written. */
|
|
#define PROT_EXEC 0x01 /* Pages can be executed. */
|
|
|
|
/* Flags contain mapping type, sharing type and options. */
|
|
|
|
/* Mapping type (must choose one and only one of these). */
|
|
#ifdef __USE_BSD
|
|
# define MAP_FILE 0x0001 /* Mapped from a file or device. */
|
|
# define MAP_ANON 0x0002 /* Allocated from anonymous virtual memory. */
|
|
# define MAP_TYPE 0x000f /* Mask for type field. */
|
|
# ifdef __USE_MISC
|
|
# define MAP_ANONYMOUS MAP_ANON /* Linux name. */
|
|
# endif
|
|
#endif
|
|
|
|
/* Sharing types (must choose one and only one of these). */
|
|
#ifdef __USE_BSD
|
|
# define MAP_COPY 0x0020 /* Virtual copy of region at mapping time. */
|
|
#endif
|
|
#define MAP_SHARED 0x0010 /* Share changes. */
|
|
#define MAP_PRIVATE 0x0000 /* Changes private; copy pages on write. */
|
|
|
|
/* Other flags. */
|
|
#define MAP_FIXED 0x0100 /* Map address must be exactly as requested. */
|
|
#ifdef __USE_BSD
|
|
# define MAP_NOEXTEND 0x0200 /* For MAP_FILE, don't change file size. */
|
|
# define MAP_HASSEMPHORE 0x0400 /* Region may contain semaphores. */
|
|
# define MAP_INHERIT 0x0800 /* Region is retained after exec. */
|
|
#endif
|
|
|
|
/* Advice to `madvise'. */
|
|
#ifdef __USE_BSD
|
|
# define MADV_NORMAL 0 /* No further special treatment. */
|
|
# define MADV_RANDOM 1 /* Expect random page references. */
|
|
# define MADV_SEQUENTIAL 2 /* Expect sequential page references. */
|
|
# define MADV_WILLNEED 3 /* Will need these pages. */
|
|
# define MADV_DONTNEED 4 /* Don't need these pages. */
|
|
#endif
|
|
|
|
/* The POSIX people had to invent similar names for the same things. */
|
|
#ifdef __USE_XOPEN2K
|
|
# define POSIX_MADV_NORMAL 0 /* No further special treatment. */
|
|
# define POSIX_MADV_RANDOM 1 /* Expect random page references. */
|
|
# define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */
|
|
# define POSIX_MADV_WILLNEED 3 /* Will need these pages. */
|
|
# define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */
|
|
#endif
|