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

   1 /* Definitions for BSD-style memory management.  Irix 4 version.
   2    Copyright (C) 1994, 1995, 1996 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 #define __need_size_t
  27 #include <stddef.h>
  28
  29
  30 /* Protections are chosen from these bits, OR'd together.  The
  31    implementation does not necessarily support PROT_EXEC or PROT_WRITE
  32    without PROT_READ.  The only guarantees are that no writing will be
  33    allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
  34
  35 #define PROT_NONE       0x00    /* No access.  */
  36 #define PROT_READ       0x04    /* Pages can be read.  */
  37 #define PROT_WRITE      0x02    /* Pages can be written.  */
  38 #define PROT_EXEC       0x01    /* Pages can be executed.  */
  39 #define PROT_EXECUTE    PROT_EXEC
  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 #define MAP_TYPE        0x0f    /* Mask for sharing type.  */
  46
  47 /* Other flags.  */
  48 #define MAP_FIXED       0x10    /* Map address must be exactly as requested. */
  49 #define MAP_RENAME      0x20    /* Rename private pages to file.  */
  50 #define MAP_AUTOGROW    0x40    /* Grow file as pages are written.  */
  51 #define MAP_LOCAL       0x80    /* Copy the mapped region on fork.  */
  52
  53 /* Advice to `madvise'.  */
  54 #define MADV_NORMAL     0       /* No further special treatment.  */
  55 #define MADV_RANDOM     1       /* Expect random page references.  */
  56 #define MADV_SEQUENTIAL 2       /* Expect sequential page references.  */
  57 #define MADV_WILLNEED   3       /* Will need these pages.  */
  58 #define MADV_DONTNEED   4       /* Don't need these pages.  */
  59
  60 /* Flags to `msync'.  */
  61 #define MS_ASYNC        0x1             /* Return immediately, don't fsync.  */
  62 #define MS_INVALIDATE   0x2             /* Invalidate caches.  */
  63
  64
  65 #include <sys/cdefs.h>
  66
  67 __BEGIN_DECLS
  68 /* Map addresses starting near ADDR and extending for LEN bytes.  from
  69    OFFSET into the file FD describes according to PROT and FLAGS.  If ADDR
  70    is nonzero, it is the desired mapping address.  If the MAP_FIXED bit is
  71    set in FLAGS, the mapping will be at ADDR exactly (which must be
  72    page-aligned); otherwise the system chooses a convenient nearby address.
  73    The return value is the actual mapping address chosen or (caddr_t) -1
  74    for errors (in which case `errno' is set).  A successful `mmap' call
  75    deallocates any previous mapping for the affected region.  */
  76
  77 __caddr_t __mmap __P ((__caddr_t __addr, size_t __len,
  78                        int __prot, int __flags, int __fd, __off_t __offset));
  79 __caddr_t mmap __P ((__caddr_t __addr, size_t __len,
  80                      int __prot, int __flags, int __fd, __off_t __offset));
  81
  82 /* Deallocate any mapping for the region starting at ADDR and extending LEN
  83    bytes.  Returns 0 if successful, -1 for errors (and sets errno).  */
  84 int __munmap __P ((__caddr_t __addr, size_t __len));
  85 int munmap __P ((__caddr_t __addr, size_t __len));
  86
  87 /* Change the memory protection of the region starting at ADDR and
  88    extending LEN bytes to PROT.  Returns 0 if successful, -1 for errors
  89    (and sets errno).  */
  90 int __mprotect __P ((__caddr_t __addr, size_t __len, int __prot));
  91 int mprotect __P ((__caddr_t __addr, size_t __len, int __prot));
  92
  93 /* Synchronize the region starting at ADDR and extending LEN bytes with the
  94    file it maps.  Filesystem operations on a file being mapped are
  95    unpredictable before this is done.  */
  96 int msync __P ((caddr_t __addr, size_t __len, int __flags));
  97
  98 /* Advise the system about particular usage patterns the program follows
  99    for the region starting at ADDR and extending LEN bytes.  */
 100 int madvise __P ((__caddr_t __addr, size_t __len, int __advice));
 101
 102 __END_DECLS
 103
 104
 105 #endif  /* sys/mman.h */