sysdeps/unix/bsd/osf/bits/mman.h

   1 /* Flags for BSD-style memory management.  OSF/1 version.
   2    Copyright (C) 1994, 1995, 1996, 1997, 1998 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 _BITS_MMAN_H
  21 #define _BITS_MMAN_H    1
  22
  23 /* Protections are chosen from these bits, OR'd together.  The
  24    implementation does not necessarily support PROT_EXEC or PROT_WRITE
  25    without PROT_READ.  The only guarantees are that no writing will be
  26    allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
  27
  28 #define PROT_NONE        0x00   /* No access.  */
  29 #define PROT_READ        0x01   /* Pages can be read.  */
  30 #define PROT_WRITE       0x02   /* Pages can be written.  */
  31 #define PROT_EXEC        0x04   /* Pages can be executed.  */
  32
  33 /* Flags contain mapping type, sharing type and options.  */
  34
  35 /* Mapping type (must choose one and only one of these).  */
  36 #ifdef __USE_BSD
  37 # define MAP_FILE        0x00   /* Mapped from a file or device.  */
  38 # define MAP_ANON        0x10   /* Allocated from anonymous virtual memory.  */
  39 # define MAP_ANONYMOUS   MAP_ANON
  40 # define MAP_TYPE        0xf0   /* Mask for type field.  */
  41 #endif
  42
  43 /* Sharing types (must choose one and only one of these).  */
  44 #define MAP_SHARED       0x01   /* Share changes.  */
  45 #define MAP_PRIVATE      0x02   /* Changes private; copy pages on write.  */
  46
  47 /* Other flags.  */
  48 #define MAP_FIXED        0x0100 /* Map address must be exactly as requested. */
  49 #ifdef __USE_BSD
  50 # define MAP_VARIABLE    0      /* Absence of MAP_FIXED.  */
  51 # define MAP_HASSEMPHORE 0x0200 /* Region may contain semaphores.  */
  52 # define MAP_INHERIT     0x0400 /* Region is retained after exec.  */
  53 # define MAP_UNALIGNED   0x0800 /* File offset need not be page-aligned.  */
  54 #endif
  55
  56 /* Advice to `madvise'.  */
  57 #ifdef __USE_BSD
  58 # define MADV_NORMAL     0      /* No further special treatment.  */
  59 # define MADV_RANDOM     1      /* Expect random page references.  */
  60 # define MADV_SEQUENTIAL 2      /* Expect sequential page references.  */
  61 # define MADV_WILLNEED   3      /* Will need these pages.  */
  62 # define MADV_DONTNEED   4      /* Don't need these pages.  */
  63 # define MADV_SPACEAVAIL 5      /* Ensure that resources are available.  */
  64 #endif
  65
  66 /* Flags to `msync'.  */
  67 #define MS_ASYNC        1               /* Asynchronous cache flush.  */
  68 #define MS_SYNC         3               /* Synchronous cache flush.  */
  69 #define MS_INVALIDATE   4               /* Invalidate cached pages.  */
  70
  71 #endif /* bits/mman.h */