sysdeps/unix/sysv/linux/x86_64/bits/mman.h

   1 /* Definitions for POSIX memory map interface.  Linux/x86_64 version.
   2    Copyright (C) 2001,2003,2005,2006,2009,2010,2011
   3    Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  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 # define MAP_STACK      0x20000         /* Allocation is for a stack.  */
  68 # define MAP_HUGETLB    0x40000         /* Create huge page mapping.  */
  69 #endif
  70
  71 /* Flags to `msync'.  */
  72 #define MS_ASYNC        1               /* Sync memory asynchronously.  */
  73 #define MS_SYNC         4               /* Synchronous memory sync.  */
  74 #define MS_INVALIDATE   2               /* Invalidate the caches.  */
  75
  76 /* Flags for `mlockall'.  */
  77 #define MCL_CURRENT     1               /* Lock all currently mapped pages.  */
  78 #define MCL_FUTURE      2               /* Lock all additions to address
  79                                            space.  */
  80
  81 /* Flags for `mremap'.  */
  82 #ifdef __USE_GNU
  83 # define MREMAP_MAYMOVE 1
  84 # define MREMAP_FIXED   2
  85 #endif
  86
  87 /* Advice to `madvise'.  */
  88 #ifdef __USE_BSD
  89 # define MADV_NORMAL      0     /* No further special treatment.  */
  90 # define MADV_RANDOM      1     /* Expect random page references.  */
  91 # define MADV_SEQUENTIAL  2     /* Expect sequential page references.  */
  92 # define MADV_WILLNEED    3     /* Will need these pages.  */
  93 # define MADV_DONTNEED    4     /* Don't need these pages.  */
  94 # define MADV_REMOVE      9     /* Remove these pages and resources.  */
  95 # define MADV_DONTFORK    10    /* Do not inherit across fork.  */
  96 # define MADV_DOFORK      11    /* Do inherit across fork.  */
  97 # define MADV_MERGEABLE   12    /* KSM may merge identical pages.  */
  98 # define MADV_UNMERGEABLE 13    /* KSM may not merge identical pages.  */
  99 # define MADV_HUGEPAGE    14    /* Worth backing with hugepages.  */
 100 # define MADV_NOHUGEPAGE  15    /* Not worth backing with hugepages.  */
 101 # define MADV_HWPOISON    100   /* Poison a page for testing.  */
 102 #endif
 103
 104 /* The POSIX people had to invent similar names for the same things.  */
 105 #ifdef __USE_XOPEN2K
 106 # define POSIX_MADV_NORMAL      0 /* No further special treatment.  */
 107 # define POSIX_MADV_RANDOM      1 /* Expect random page references.  */
 108 # define POSIX_MADV_SEQUENTIAL  2 /* Expect sequential page references.  */
 109 # define POSIX_MADV_WILLNEED    3 /* Will need these pages.  */
 110 # define POSIX_MADV_DONTNEED    4 /* Don't need these pages.  */
 111 #endif