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

   1 /* Definitions for POSIX memory map interface.  Linux/Alpha version.
   2    Copyright (C) 1997, 1998, 2000, 2003, 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         0x100         /* Interpret addr exactly.  */
  51 #ifdef __USE_MISC
  52 # define MAP_FILE         0
  53 # define MAP_ANONYMOUS    0x10          /* Don't use a file.  */
  54 # define MAP_ANON         MAP_ANONYMOUS
  55 #endif
  56
  57 /* Not used by Linux, but here to make sure we don't clash with
  58    OSF/1 defines.  */
  59 #if 0 && defined __USE_BSD
  60 # define MAP_HASSEMAPHORE 0x0200
  61 # define MAP_INHERIT      0x0400
  62 # define MAP_UNALIGNED    0x0800
  63 #endif
  64
  65 /* These are Linux-specific.  */
  66 #ifdef __USE_MISC
  67 # define MAP_GROWSDOWN    0x01000       /* Stack-like segment.  */
  68 # define MAP_DENYWRITE    0x02000       /* ETXTBSY */
  69 # define MAP_EXECUTABLE   0x04000       /* Mark it as an executable.  */
  70 # define MAP_LOCKED       0x08000       /* Lock the mapping.  */
  71 # define MAP_NORESERVE    0x10000       /* Don't check for reservations.  */
  72 # define MAP_POPULATE     0x20000       /* Populate (prefault) pagetables.  */
  73 # define MAP_NONBLOCK     0x40000       /* Do not block on IO.  */
  74 #endif
  75
  76 /* Flags to `msync'.  */
  77 #define MS_ASYNC          1             /* Sync memory asynchronously.  */
  78 #define MS_SYNC           2             /* Synchronous memory sync.  */
  79 #define MS_INVALIDATE     4             /* Invalidate the caches.  */
  80
  81 /* Flags for `mlockall'.  */
  82 #define MCL_CURRENT       8192          /* Lock all currently mapped pages.  */
  83 #define MCL_FUTURE        16384         /* Lock all additions to address
  84                                            space.  */
  85
  86 /* Flags for `mremap'.  */
  87 #ifdef __USE_GNU
  88 # define MREMAP_MAYMOVE 1
  89 # define MREMAP_FIXED   2
  90 #endif
  91
  92 /* Advice to `madvise'.  */
  93 #ifdef __USE_BSD
  94 # define MADV_NORMAL     0      /* No further special treatment.  */
  95 # define MADV_RANDOM     1      /* Expect random page references.  */
  96 # define MADV_SEQUENTIAL 2      /* Expect sequential page references.  */
  97 # define MADV_WILLNEED   3      /* Will need these pages.  */
  98 # define MADV_DONTNEED   6      /* Don't need these pages.  */
  99 # define MADV_REMOVE     9      /* Remove these pages and resources.  */
 100 # define MADV_DONTFORK   10     /* Do not inherit across fork.  */
 101 # define MADV_DOFORK     11     /* Do inherit across fork.  */
 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    6 /* Don't need these pages.  */
 111 #endif
 112
 113 /* Not used by Linux, but here to make sure we don't clash with
 114    OSF/1 defines.  */
 115 #if 0 && defined __USE_BSD
 116 # define MADV_DONTNEED_COMPAT 4 /* Old version?  */
 117 # define MADV_SPACEAVAIL 5      /* Ensure resources are available.  */
 118 #endif