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mman.h

/* Definitions for BSD-style memory management.
   Copyright (C) 1994-1998,2000,01,02,05 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

/* These are the bits used by 4.4 BSD and its derivatives.  On systems
   (such as GNU) where these facilities are not system services but can be
   emulated in the C library, these are the definitions we emulate.  */

#ifndef _SYS_MMAN_H
# error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
#endif

/* Protections are chosen from these bits, OR'd together.  The
   implementation does not necessarily support PROT_EXEC or PROT_WRITE
   without PROT_READ.  The only guarantees are that no writing will be
   allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */

#define     PROT_NONE    0x00 /* No access.  */
#define     PROT_READ    0x04 /* Pages can be read.  */
#define     PROT_WRITE   0x02 /* Pages can be written.  */
#define     PROT_EXEC    0x01 /* Pages can be executed.  */

/* Flags contain mapping type, sharing type and options.  */

/* Mapping type (must choose one and only one of these).  */
#ifdef __USE_BSD
# define MAP_FILE  0x0001     /* Mapped from a file or device.  */
# define MAP_ANON  0x0002     /* Allocated from anonymous virtual memory.  */
# define MAP_TYPE  0x000f     /* Mask for type field.  */
# ifdef __USE_MISC
#  define MAP_ANONYMOUS  MAP_ANON /* Linux name. */
# endif
#endif

/* Sharing types (must choose one and only one of these).  */
#ifdef __USE_BSD
# define MAP_COPY  0x0020     /* Virtual copy of region at mapping time.  */
#endif
#define     MAP_SHARED   0x0010     /* Share changes.  */
#define     MAP_PRIVATE  0x0000     /* Changes private; copy pages on write.  */

/* Other flags.  */
#define     MAP_FIXED    0x0100     /* Map address must be exactly as requested. */
#ifdef __USE_BSD
# define MAP_NOEXTEND    0x0200     /* For MAP_FILE, don't change file size.  */
# define MAP_HASSEMPHORE 0x0400     /* Region may contain semaphores.  */
# define MAP_INHERIT     0x0800     /* Region is retained after exec.  */
#endif

/* Advice to `madvise'.  */
#ifdef __USE_BSD
# define MADV_NORMAL     0    /* No further special treatment.  */
# define MADV_RANDOM     1    /* Expect random page references.  */
# define MADV_SEQUENTIAL 2    /* Expect sequential page references.  */
# define MADV_WILLNEED   3    /* Will need these pages.  */
# define MADV_DONTNEED   4    /* Don't need these pages.  */
#endif

/* The POSIX people had to invent similar names for the same things.  */
#ifdef __USE_XOPEN2K
# define POSIX_MADV_NORMAL    0 /* No further special treatment.  */
# define POSIX_MADV_RANDOM    1 /* Expect random page references.  */
# define POSIX_MADV_SEQUENTIAL      2 /* Expect sequential page references.  */
# define POSIX_MADV_WILLNEED  3 /* Will need these pages.  */
# define POSIX_MADV_DONTNEED  4 /* Don't need these pages.  */
#endif

/* Flags to `msync'.  */
#define MS_ASYNC  1           /* Sync memory asynchronously.  */
#define MS_SYNC         0           /* Synchronous memory sync.  */
#define MS_INVALIDATE   2           /* Invalidate the caches.  */

/* Flags for `mremap'.  */
#ifdef __USE_GNU
# define MREMAP_MAYMOVE 1           /* Mapping address may change.  */
# define MREMAP_FIXED   2           /* Fifth argument sets new address.  */
#endif

/* Flags for `mlockall' (can be OR'd together).  */
#define MCL_CURRENT     1           /* Lock all currently mapped pages.  */
#define MCL_FUTURE      2           /* Lock all additions to address
                                 space.  */

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