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      1 /* Definitions for POSIX memory map interface.  Linux/x86_64 version.
      2    Copyright (C) 2001, 2003, 2005, 2006 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, write to the Free
     17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     18    02111-1307 USA.  */
     19 
     20 #ifndef _SYS_MMAN_H
     21 # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
     22 #endif
     23 
     24 /* The following definitions basically come from the kernel headers.
     25    But the kernel header is not namespace clean.  */
     26 
     27 
     28 /* Protections are chosen from these bits, OR'd together.  The
     29    implementation does not necessarily support PROT_EXEC or PROT_WRITE
     30    without PROT_READ.  The only guarantees are that no writing will be
     31    allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
     32 
     33 #define PROT_READ	0x1		/* Page can be read.  */
     34 #define PROT_WRITE	0x2		/* Page can be written.  */
     35 #define PROT_EXEC	0x4		/* Page can be executed.  */
     36 #define PROT_NONE	0x0		/* Page can not be accessed.  */
     37 #define PROT_GROWSDOWN	0x01000000	/* Extend change to start of
     38 					   growsdown vma (mprotect only).  */
     39 #define PROT_GROWSUP	0x02000000	/* Extend change to start of
     40 					   growsup vma (mprotect only).  */
     41 
     42 /* Sharing types (must choose one and only one of these).  */
     43 #define MAP_SHARED	0x01		/* Share changes.  */
     44 #define MAP_PRIVATE	0x02		/* Changes are private.  */
     45 #ifdef __USE_MISC
     46 # define MAP_TYPE	0x0f		/* Mask for type of mapping.  */
     47 #endif
     48 
     49 /* Other flags.  */
     50 #define MAP_FIXED	0x10		/* Interpret addr exactly.  */
     51 #ifdef __USE_MISC
     52 # define MAP_FILE	0
     53 # define MAP_ANONYMOUS	0x20		/* Don't use a file.  */
     54 # define MAP_ANON	MAP_ANONYMOUS
     55 # define MAP_32BIT	0x40		/* Only give out 32-bit addresses.  */
     56 #endif
     57 
     58 /* These are Linux-specific.  */
     59 #ifdef __USE_MISC
     60 # define MAP_GROWSDOWN	0x00100		/* Stack-like segment.  */
     61 # define MAP_DENYWRITE	0x00800		/* ETXTBSY */
     62 # define MAP_EXECUTABLE	0x01000		/* Mark it as an executable.  */
     63 # define MAP_LOCKED	0x02000		/* Lock the mapping.  */
     64 # define MAP_NORESERVE	0x04000		/* Don't check for reservations.  */
     65 # define MAP_POPULATE	0x08000		/* Populate (prefault) pagetables.  */
     66 # define MAP_NONBLOCK	0x10000		/* Do not block on IO.  */
     67 #endif
     68 
     69 /* Flags to `msync'.  */
     70 #define MS_ASYNC	1		/* Sync memory asynchronously.  */
     71 #define MS_SYNC		4		/* Synchronous memory sync.  */
     72 #define MS_INVALIDATE	2		/* Invalidate the caches.  */
     73 
     74 /* Flags for `mlockall'.  */
     75 #define MCL_CURRENT	1		/* Lock all currently mapped pages.  */
     76 #define MCL_FUTURE	2		/* Lock all additions to address
     77 					   space.  */
     78 
     79 /* Flags for `mremap'.  */
     80 #ifdef __USE_GNU
     81 # define MREMAP_MAYMOVE	1
     82 # define MREMAP_FIXED	2
     83 #endif
     84 
     85 /* Advice to `madvise'.  */
     86 #ifdef __USE_BSD
     87 # define MADV_NORMAL	 0	/* No further special treatment.  */
     88 # define MADV_RANDOM	 1	/* Expect random page references.  */
     89 # define MADV_SEQUENTIAL 2	/* Expect sequential page references.  */
     90 # define MADV_WILLNEED	 3	/* Will need these pages.  */
     91 # define MADV_DONTNEED	 4	/* Don't need these pages.  */
     92 # define MADV_REMOVE	 9	/* Remove these pages and resources.  */
     93 # define MADV_DONTFORK	 10	/* Do not inherit across fork.  */
     94 # define MADV_DOFORK	 11	/* Do inherit across fork.  */
     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