sysdeps/unix/sysv/linux/i386/bits/mman.h

   1 /* Definitions for POSIX memory map inerface.  Linux/i386 version.
   2    Copyright (C) 1997 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _SYS_MMAN_H
  21 # error "Never include this file directly.  Use <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
  38 /* Sharing types (must choose one and only one of these).  */
  39 #define MAP_SHARED      0x01            /* Share changes.  */
  40 #define MAP_PRIVATE     0x02            /* Changes are private.  */
  41 #ifdef __USE_MISC
  42 # define MAP_TYPE       0x0f            /* Mask for type of mapping.  */
  43 #endif
  44
  45 /* Other flags.  */
  46 #define MAP_FIXED       0x10            /* Interpret addr exactly.  */
  47 #ifdef __USE_MISC
  48 # define MAP_FILE       0
  49 # define MAP_ANONYMOUS  0x20            /* Don't use a file.  */
  50 # define MAP_ANON       MAP_ANONYMOUS
  51 #endif
  52
  53 /* These are Linux-specific.  */
  54 #ifdef __USE_MISC
  55 # define MAP_GROWSDOWN  0x0100          /* Stack-like segment.  */
  56 # define MAP_DENYWRITE  0x0800          /* ETXTBSY */
  57 # define MAP_EXECUTABLE 0x1000          /* Mark it as an executable.  */
  58 # define MAP_LOCKED     0x2000          /* Lock the mapping.  */
  59 # define MAP_NORESERVE  0x4000          /* Don't check for reservations.  */
  60 #endif
  61
  62 /* Flags to `msync'.  */
  63 #define MS_ASYNC        1               /* Sync memory asynchronously.  */
  64 #define MS_SYNC         4               /* Synchronous memory sync.  */
  65 #define MS_INVALIDATE   2               /* Invalidate the caches.  */
  66
  67 /* Flags for `mlockall'.  */
  68 #define MCL_CURRENT     1               /* Lock all currently mapped pages.  */
  69 #define MCL_FUTURE      2               /* Lock all additions to address
  70                                            space.  */
  71
  72 /* Flags for `mremap'.  */
  73 #ifdef __USE_GNU
  74 # define MREMAP_MAYMOVE 1
  75 #endif