1    	/* Definitions for BSD-style memory management.
2    	   Copyright (C) 1994-2015 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   	#define	_SYS_MMAN_H	1
21   	
22   	#include <features.h>
23   	#include <bits/types.h>
24   	#define __need_size_t
25   	#include <stddef.h>
26   	
27   	#ifndef __off_t_defined
28   	# ifndef __USE_FILE_OFFSET64
29   	typedef __off_t off_t;
30   	# else
31   	typedef __off64_t off_t;
32   	# endif
33   	# define __off_t_defined
34   	#endif
35   	
36   	#ifndef __mode_t_defined
37   	typedef __mode_t mode_t;
38   	# define __mode_t_defined
39   	#endif
40   	
41   	#include <bits/mman.h>
42   	
43   	/* Return value of `mmap' in case of an error.  */
44   	#define MAP_FAILED	((void *) -1)
45   	
46   	__BEGIN_DECLS
47   	/* Map addresses starting near ADDR and extending for LEN bytes.  from
48   	   OFFSET into the file FD describes according to PROT and FLAGS.  If ADDR
49   	   is nonzero, it is the desired mapping address.  If the MAP_FIXED bit is
50   	   set in FLAGS, the mapping will be at ADDR exactly (which must be
51   	   page-aligned); otherwise the system chooses a convenient nearby address.
52   	   The return value is the actual mapping address chosen or MAP_FAILED
53   	   for errors (in which case `errno' is set).  A successful `mmap' call
54   	   deallocates any previous mapping for the affected region.  */
55   	
56   	#ifndef __USE_FILE_OFFSET64
57   	extern void *mmap (void *__addr, size_t __len, int __prot,
58   			   int __flags, int __fd, __off_t __offset) __THROW;
59   	#else
60   	# ifdef __REDIRECT_NTH
61   	extern void * __REDIRECT_NTH (mmap,
62   				      (void *__addr, size_t __len, int __prot,
63   				       int __flags, int __fd, __off64_t __offset),
64   				      mmap64);
65   	# else
66   	#  define mmap mmap64
67   	# endif
68   	#endif
69   	#ifdef __USE_LARGEFILE64
70   	extern void *mmap64 (void *__addr, size_t __len, int __prot,
71   			     int __flags, int __fd, __off64_t __offset) __THROW;
72   	#endif
73   	
74   	/* Deallocate any mapping for the region starting at ADDR and extending LEN
75   	   bytes.  Returns 0 if successful, -1 for errors (and sets errno).  */
76   	extern int munmap (void *__addr, size_t __len) __THROW;
77   	
78   	/* Change the memory protection of the region starting at ADDR and
79   	   extending LEN bytes to PROT.  Returns 0 if successful, -1 for errors
80   	   (and sets errno).  */
81   	extern int mprotect (void *__addr, size_t __len, int __prot) __THROW;
82   	
83   	/* Synchronize the region starting at ADDR and extending LEN bytes with the
84   	   file it maps.  Filesystem operations on a file being mapped are
85   	   unpredictable before this is done.  Flags are from the MS_* set.
86   	
87   	   This function is a cancellation point and therefore not marked with
88   	   __THROW.  */
89   	extern int msync (void *__addr, size_t __len, int __flags);
90   	
91   	#ifdef __USE_MISC
92   	/* Advise the system about particular usage patterns the program follows
93   	   for the region starting at ADDR and extending LEN bytes.  */
94   	extern int madvise (void *__addr, size_t __len, int __advice) __THROW;
95   	#endif
96   	#ifdef __USE_XOPEN2K
97   	/* This is the POSIX name for this function.  */
98   	extern int posix_madvise (void *__addr, size_t __len, int __advice) __THROW;
99   	#endif
100  	
101  	/* Guarantee all whole pages mapped by the range [ADDR,ADDR+LEN) to
102  	   be memory resident.  */
103  	extern int mlock (const void *__addr, size_t __len) __THROW;
104  	
105  	/* Unlock whole pages previously mapped by the range [ADDR,ADDR+LEN).  */
106  	extern int munlock (const void *__addr, size_t __len) __THROW;
107  	
108  	/* Cause all currently mapped pages of the process to be memory resident
109  	   until unlocked by a call to the `munlockall', until the process exits,
110  	   or until the process calls `execve'.  */
111  	extern int mlockall (int __flags) __THROW;
112  	
113  	/* All currently mapped pages of the process' address space become
114  	   unlocked.  */
115  	extern int munlockall (void) __THROW;
116  	
117  	#ifdef __USE_MISC
118  	/* mincore returns the memory residency status of the pages in the
119  	   current process's address space specified by [start, start + len).
120  	   The status is returned in a vector of bytes.  The least significant
121  	   bit of each byte is 1 if the referenced page is in memory, otherwise
122  	   it is zero.  */
123  	extern int mincore (void *__start, size_t __len, unsigned char *__vec)
124  	     __THROW;
125  	#endif
126  	
127  	#ifdef __USE_GNU
128  	/* Remap pages mapped by the range [ADDR,ADDR+OLD_LEN) to new length
129  	   NEW_LEN.  If MREMAP_MAYMOVE is set in FLAGS the returned address
130  	   may differ from ADDR.  If MREMAP_FIXED is set in FLAGS the function
131  	   takes another parameter which is a fixed address at which the block
132  	   resides after a successful call.  */
133  	extern void *mremap (void *__addr, size_t __old_len, size_t __new_len,
134  			     int __flags, ...) __THROW;
135  	
136  	/* Remap arbitrary pages of a shared backing store within an existing
137  	   VMA.  */
138  	extern int remap_file_pages (void *__start, size_t __size, int __prot,
139  				     size_t __pgoff, int __flags) __THROW;
140  	#endif
141  	
142  	
143  	/* Open shared memory segment.  */
144  	extern int shm_open (const char *__name, int __oflag, mode_t __mode);
145  	
146  	/* Remove shared memory segment.  */
147  	extern int shm_unlink (const char *__name);
148  	
149  	__END_DECLS
150  	
151  	#endif	/* sys/mman.h */
152