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

   1 /* Definitions for POSIX memory map interface.  Linux/MIPS version.
   2    Copyright (C) 1997, 2000, 2003, 2004 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       0x00
  53 # define MAP_ANONYMOUS  0x0800          /* Don't use a file.  */
  54 # define MAP_ANON       MAP_ANONYMOUS
  55 # define MAP_RENAME     MAP_ANONYMOUS
  56 #endif
  57
  58 /* These are Linux-specific.  */
  59 #ifdef __USE_MISC
  60 # define MAP_NORESERVE  0x0400          /* don't check for reservations */
  61 # define MAP_ANONYMOUS  0x0800          /* don't use a file */
  62 # define MAP_GROWSDOWN  0x1000          /* stack-like segment */
  63 # define MAP_DENYWRITE  0x2000          /* ETXTBSY */
  64 # define MAP_EXECUTABLE 0x4000          /* mark it as an executable */
  65 # define MAP_LOCKED     0x8000          /* pages are locked */
  66 # define MAP_POPULATE   0x10000         /* populate (prefault) pagetables */
  67 # define MAP_NONBLOCK   0x20000         /* do not block on IO */
  68 #endif
  69
  70 /* Flags to `msync'.  */
  71 #define MS_ASYNC        1               /* Sync memory asynchronously.  */
  72 #define MS_INVALIDATE   2               /* Invalidate the caches.  */
  73 #define MS_SYNC         4               /* Synchronous memory sync.  */
  74
  75 /* Flags for `mlockall'.  */
  76 #define MCL_CURRENT     1               /* Lock all currently mapped pages.  */
  77 #define MCL_FUTURE      2               /* Lock all additions to address
  78                                            space.  */
  79
  80 /* Advice to `madvise'.  */
  81 #ifdef __USE_BSD
  82 #define MADV_NORMAL     0               /* default page-in behavior */
  83 #define MADV_RANDOM     1               /* page-in minimum required */
  84 #define MADV_SEQUENTIAL 2               /* read-ahead aggressively */
  85 #define MADV_WILLNEED   3               /* pre-fault pages */
  86 #define MADV_DONTNEED   4               /* discard these pages */
  87 #endif
  88
  89 /* Flags for `mremap'.  */
  90 #ifdef __USE_GNU
  91 # define MREMAP_MAYMOVE 1
  92 #endif