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100 lines
3.7 KiB
C
100 lines
3.7 KiB
C
/* Definitions for POSIX memory map interface. Linux/Alpha version.
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Copyright (C) 1997, 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _SYS_MMAN_H
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# error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
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#endif
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/* The following definitions basically come from the kernel headers.
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But the kernel header is not namespace clean. */
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/* Protections are chosen from these bits, OR'd together. The
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implementation does not necessarily support PROT_EXEC or PROT_WRITE
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without PROT_READ. The only guarantees are that no writing will be
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allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
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#define PROT_READ 0x1 /* Page can be read. */
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#define PROT_WRITE 0x2 /* Page can be written. */
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#define PROT_EXEC 0x4 /* Page can be executed. */
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#define PROT_NONE 0x0 /* Page can not be accessed. */
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/* Sharing types (must choose one and only one of these). */
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#define MAP_SHARED 0x01 /* Share changes. */
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#define MAP_PRIVATE 0x02 /* Changes are private. */
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#ifdef __USE_MISC
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# define MAP_TYPE 0x0f /* Mask for type of mapping. */
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#endif
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/* Other flags. */
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#define MAP_FIXED 0x100 /* Interpret addr exactly. */
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#ifdef __USE_MISC
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# define MAP_FILE 0
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# define MAP_ANONYMOUS 0x10 /* Don't use a file. */
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# define MAP_ANON MAP_ANONYMOUS
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#endif
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/* Not used by Linux, but here to make sure we don't clash with
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OSF/1 defines. */
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#if 0 && defined(__USE_BSD)
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# define MAP_HASSEMAPHORE 0x0200
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# define MAP_INHERIT 0x0400
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# define MAP_UNALIGNED 0x0800
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#endif
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/* These are Linux-specific. */
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#ifdef __USE_MISC
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# define MAP_GROWSDOWN 0x1000 /* Stack-like segment. */
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# define MAP_DENYWRITE 0x2000 /* ETXTBSY */
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# define MAP_EXECUTABLE 0x4000 /* Mark it as an executable. */
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# define MAP_LOCKED 0x8000 /* Lock the mapping. */
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# define MAP_NORESERVE 0x10000 /* Don't check for reservations. */
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#endif
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/* Flags to `msync'. */
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#define MS_ASYNC 1 /* Sync memory asynchronously. */
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#define MS_SYNC 2 /* Synchronous memory sync. */
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#define MS_INVALIDATE 4 /* Invalidate the caches. */
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/* Flags for `mlockall'. */
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#define MCL_CURRENT 8192 /* Lock all currently mapped pages. */
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#define MCL_FUTURE 16384 /* Lock all additions to address
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space. */
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/* Flags for `mremap'. */
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#ifdef __USE_GNU
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# define MREMAP_MAYMOVE 1
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#endif
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/* Advice to `madvise'. */
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#ifdef __USE_BSD
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# define MADV_NORMAL 0 /* No further special treatment. */
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# define MADV_RANDOM 1 /* Expect random page references. */
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# define MADV_SEQUENTIAL 2 /* Expect sequential page references. */
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# define MADV_WILLNEED 3 /* Will need these pages. */
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# define MADV_DONTNEED 6 /* Don't need these pages. */
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#endif
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/* Not used by Linux, but here to make sure we don't clash with
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OSF/1 defines. */
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#if 0 && defined(__USE_BSD)
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# define MADV_DONTNEED_COMPAT 4 /* Old version? */
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# define MADV_SPACEAVAIL 5 /* Ensure resources are available. */
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#endif
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