sysdeps/unix/bsd/sun/sunos4/bits/mman.h

   1 /* Definitions for BSD-style memory management.  SunOS 4 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 /* Sharing types (must choose one and only one of these).  */
  34 #define MAP_SHARED      0x01    /* Share changes.  */
  35 #define MAP_PRIVATE     0x02    /* Changes private; copy pages on write.  */
  36 #ifdef __USE_BSD
  37 # define MAP_TYPE       0x0f    /* Mask for sharing type.  */
  38 #endif
  39
  40 /* Other flags.  */
  41 #define MAP_FIXED       0x10    /* Map address must be exactly as requested. */
  42 /* The following three flags are not actually implemented in SunOS 4.1.  */
  43 #ifdef __USE_BSD
  44 # define MAP_RENAME     0x20    /* Rename private pages to file.  */
  45 # define MAP_NORESERVE  0x40    /* Don't reserve needed swap area.  */
  46 # define MAP_INHERIT    0x80    /* Region is retained after exec.  */
  47 #endif
  48
  49 /* This is an internal flag that is always set in `mmap' system calls.  In
  50    older versions of SunOS 4 `mmap' did not return the actual mapping
  51    address, but always returned zero.  This flag says to return the
  52    address; the `mmap' C library function always sets it.  */
  53 #define _MAP_NEW        0x80000000
  54
  55 /* Advice to `madvise'.  */
  56 #ifdef __USE_BSD
  57 # define MADV_NORMAL    0       /* No further special treatment.  */
  58 # define MADV_RANDOM    1       /* Expect random page references.  */
  59 # define MADV_SEQUENTIAL        2       /* Expect sequential page references.  */
  60 # define MADV_WILLNEED  3       /* Will need these pages.  */
  61 # define MADV_DONTNEED  4       /* Don't need these pages.  */
  62 #endif
  63
  64 /* Flags to `msync'.  */
  65 #define MS_ASYNC        0x1             /* Return immediately, don't fsync.  */
  66 #define MS_INVALIDATE   0x2             /* Invalidate caches.  */
  67
  68 #endif /* bits/mman.h */