sysdeps/unix/sysv/irix4/sys/mman.h

   1 /* Definitions for BSD-style memory management.  Irix 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 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
  22 #define _SYS_MMAN_H     1
  23 #include <features.h>
  24
  25 #include <bits/types.h>
  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_NONE        0x00   /* No access.  */
  34 #define PROT_READ        0x04   /* Pages can be read.  */
  35 #define PROT_WRITE       0x02   /* Pages can be written.  */
  36 #define PROT_EXEC        0x01   /* Pages can be executed.  */
  37 #ifdef __USE_MISC
  38 # define PROT_EXECUTE    PROT_EXEC
  39 #endif
  40
  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 private; copy pages on write.  */
  45 #ifdef __USE_BSD
  46 # define MAP_TYPE        0x0f   /* Mask for sharing type.  */
  47 #endif
  48
  49 /* Other flags.  */
  50 #define MAP_FIXED        0x10   /* Map address must be exactly as requested. */
  51 #ifdef __USE_MISC
  52 # define MAP_RENAME      0x20   /* Rename private pages to file.  */
  53 # define MAP_AUTOGROW    0x40   /* Grow file as pages are written.  */
  54 # define MAP_LOCAL       0x80   /* Copy the mapped region on fork.  */
  55 #endif
  56
  57 /* Advice to `madvise'.  */
  58 #ifdef __USE_BSD
  59 # define MADV_NORMAL     0      /* No further special treatment.  */
  60 # define MADV_RANDOM     1      /* Expect random page references.  */
  61 # define MADV_SEQUENTIAL 2      /* Expect sequential page references.  */
  62 # define MADV_WILLNEED   3      /* Will need these pages.  */
  63 # define MADV_DONTNEED   4      /* Don't need these pages.  */
  64 #endif
  65
  66 /* Flags to `msync'.  */
  67 #define MS_ASYNC         0x1            /* Return immediately, don't fsync.  */
  68 #define MS_INVALIDATE    0x2            /* Invalidate caches.  */
  69
  70 /* Return value of `mmap' in case of an error.  */
  71 #define MAP_FAILED      ((__ptr_t) -1)
  72
  73
  74 __BEGIN_DECLS
  75 /* Map addresses starting near ADDR and extending for LEN bytes.  from
  76    OFFSET into the file FD describes according to PROT and FLAGS.  If ADDR
  77    is nonzero, it is the desired mapping address.  If the MAP_FIXED bit is
  78    set in FLAGS, the mapping will be at ADDR exactly (which must be
  79    page-aligned); otherwise the system chooses a convenient nearby address.
  80    The return value is the actual mapping address chosen or MAP_FAILED
  81    for errors (in which case `errno' is set).  A successful `mmap' call
  82    deallocates any previous mapping for the affected region.  */
  83
  84 extern __ptr_t mmap __P ((__ptr_t __addr, size_t __len, int __prot,
  85                         int __flags, int __fd, __off_t __offset));
  86
  87 /* Deallocate any mapping for the region starting at ADDR and extending LEN
  88    bytes.  Returns 0 if successful, -1 for errors (and sets errno).  */
  89 extern int munmap __P ((__ptr_t __addr, size_t __len));
  90
  91 /* Change the memory protection of the region starting at ADDR and
  92    extending LEN bytes to PROT.  Returns 0 if successful, -1 for errors
  93    (and sets errno).  */
  94 extern int mprotect __P ((__ptr_t __addr, size_t __len, int __prot));
  95
  96 /* Synchronize the region starting at ADDR and extending LEN bytes with the
  97    file it maps.  Filesystem operations on a file being mapped are
  98    unpredictable before this is done.  */
  99 extern int msync __P ((__ptr_t __addr, size_t __len, int __flags));
 100
 101 #ifdef __USE_BSD
 102 /* Advise the system about particular usage patterns the program follows
 103    for the region starting at ADDR and extending LEN bytes.  */
 104 extern int madvise __P ((__ptr_t __addr, size_t __len, int __advice));
 105 #endif
 106
 107 __END_DECLS
 108
 109
 110 #endif  /* sys/mman.h */