1    	/* Definitions for POSIX memory map interface.  Linux generic version.
2    	   Copyright (C) 2001-2015 Free Software Foundation, Inc.
3    	   This file is part of the GNU C Library.
4    	
5    	   The GNU C Library is free software; you can redistribute it and/or
6    	   modify it under the terms of the GNU Lesser General Public
7    	   License as published by the Free Software Foundation; either
8    	   version 2.1 of the License, or (at your option) any later version.
9    	
10   	   The GNU C Library is distributed in the hope that it will be useful,
11   	   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   	   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   	   Lesser General Public License for more details.
14   	
15   	   You should have received a copy of the GNU Lesser General Public
16   	   License along with the GNU C Library; if not, see
17   	   <http://www.gnu.org/licenses/>.  */
18   	
19   	#ifndef _SYS_MMAN_H
20   	# error "Never use <bits/mman-linux.h> directly; include <sys/mman.h> instead."
21   	#endif
22   	
23   	/* The following definitions basically come from the kernel headers.
24   	   But the kernel header is not namespace clean.
25   	
26   	   This file is also used by some non-Linux configurations of the
27   	   GNU C Library, for other systems that use these same bit values.  */
28   	
29   	
30   	/* Protections are chosen from these bits, OR'd together.  The
31   	   implementation does not necessarily support PROT_EXEC or PROT_WRITE
32   	   without PROT_READ.  The only guarantees are that no writing will be
33   	   allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
34   	
35   	#define PROT_READ	0x1		/* Page can be read.  */
36   	#define PROT_WRITE	0x2		/* Page can be written.  */
37   	#define PROT_EXEC	0x4		/* Page can be executed.  */
38   	#define PROT_NONE	0x0		/* Page can not be accessed.  */
39   	#define PROT_GROWSDOWN	0x01000000	/* Extend change to start of
40   						   growsdown vma (mprotect only).  */
41   	#define PROT_GROWSUP	0x02000000	/* Extend change to start of
42   						   growsup vma (mprotect only).  */
43   	
44   	/* Sharing types (must choose one and only one of these).  */
45   	#define MAP_SHARED	0x01		/* Share changes.  */
46   	#define MAP_PRIVATE	0x02		/* Changes are private.  */
47   	#ifdef __USE_MISC
48   	# define MAP_TYPE	0x0f		/* Mask for type of mapping.  */
49   	#endif
50   	
51   	/* Other flags.  */
52   	#define MAP_FIXED	0x10		/* Interpret addr exactly.  */
53   	#ifdef __USE_MISC
54   	# define MAP_FILE	0
55   	# ifdef __MAP_ANONYMOUS
56   	#  define MAP_ANONYMOUS	__MAP_ANONYMOUS	/* Don't use a file.  */
57   	# else
58   	#  define MAP_ANONYMOUS	0x20		/* Don't use a file.  */
59   	# endif
60   	# define MAP_ANON	MAP_ANONYMOUS
61   	/* When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size.  */
62   	# define MAP_HUGE_SHIFT	26
63   	# define MAP_HUGE_MASK	0x3f
64   	#endif
65   	
66   	/* Flags to `msync'.  */
67   	#define MS_ASYNC	1		/* Sync memory asynchronously.  */
68   	#define MS_SYNC		4		/* Synchronous memory sync.  */
69   	#define MS_INVALIDATE	2		/* Invalidate the caches.  */
70   	
71   	/* Flags for `mremap'.  */
72   	#ifdef __USE_GNU
73   	# define MREMAP_MAYMOVE	1
74   	# define MREMAP_FIXED	2
75   	#endif
76   	
77   	/* Advice to `madvise'.  */
78   	#ifdef __USE_MISC
79   	# define MADV_NORMAL	  0	/* No further special treatment.  */
80   	# define MADV_RANDOM	  1	/* Expect random page references.  */
81   	# define MADV_SEQUENTIAL  2	/* Expect sequential page references.  */
82   	# define MADV_WILLNEED	  3	/* Will need these pages.  */
83   	# define MADV_DONTNEED	  4	/* Don't need these pages.  */
84   	# define MADV_REMOVE	  9	/* Remove these pages and resources.  */
85   	# define MADV_DONTFORK	  10	/* Do not inherit across fork.  */
86   	# define MADV_DOFORK	  11	/* Do inherit across fork.  */
87   	# define MADV_MERGEABLE	  12	/* KSM may merge identical pages.  */
88   	# define MADV_UNMERGEABLE 13	/* KSM may not merge identical pages.  */
89   	# define MADV_HUGEPAGE	  14	/* Worth backing with hugepages.  */
90   	# define MADV_NOHUGEPAGE  15	/* Not worth backing with hugepages.  */
91   	# define MADV_DONTDUMP	  16    /* Explicity exclude from the core dump,
92   	                                   overrides the coredump filter bits.  */
93   	# define MADV_DODUMP	  17	/* Clear the MADV_DONTDUMP flag.  */
94   	# define MADV_HWPOISON	  100	/* Poison a page for testing.  */
95   	#endif
96   	
97   	/* The POSIX people had to invent similar names for the same things.  */
98   	#ifdef __USE_XOPEN2K
99   	# define POSIX_MADV_NORMAL	0 /* No further special treatment.  */
100  	# define POSIX_MADV_RANDOM	1 /* Expect random page references.  */
101  	# define POSIX_MADV_SEQUENTIAL	2 /* Expect sequential page references.  */
102  	# define POSIX_MADV_WILLNEED	3 /* Will need these pages.  */
103  	# define POSIX_MADV_DONTNEED	4 /* Don't need these pages.  */
104  	#endif
105  	
106  	/* Flags for `mlockall'.  */
107  	#ifndef MCL_CURRENT
108  	# define MCL_CURRENT	1		/* Lock all currently mapped pages.  */
109  	# define MCL_FUTURE	2		/* Lock all additions to address
110  						   space.  */
111  	#endif
112