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/* Definitions for BSD-style memory management.

   Copyright (C) 1994-2000, 2003, 2004 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.  */

#ifndef _SYS_MMAN_H

#define _SYS_MMAN_H     1

#include <features.h>

#include <bits/types.h>

#define __need_size_t

#include <stddef.h>

#ifndef __off_t_defined

# ifndef __USE_FILE_OFFSET64

typedef __off_t off_t;

# else

typedef __off64_t off_t;

# endif

# define __off_t_defined

#endif

#ifndef __mode_t_defined

typedef __mode_t mode_t;

# define __mode_t_defined

#endif

#include <bits/mman.h>

/* Return value of `mmap' in case of an error.  */

#define MAP_FAILED      ((void *) -1)

__BEGIN_DECLS

/* Map addresses starting near ADDR and extending for LEN bytes.  from

   OFFSET into the file FD describes according to PROT and FLAGS.  If ADDR

   is nonzero, it is the desired mapping address.  If the MAP_FIXED bit is

   set in FLAGS, the mapping will be at ADDR exactly (which must be

   page-aligned); otherwise the system chooses a convenient nearby address.

   The return value is the actual mapping address chosen or MAP_FAILED

   for errors (in which case `errno' is set).  A successful `mmap' call

   deallocates any previous mapping for the affected region.  */

#ifndef __USE_FILE_OFFSET64

extern void *mmap (void *__addr, size_t __len, int __prot,

                   int __flags, int __fd, __off_t __offset) __THROW;

#else

# ifdef __REDIRECT

extern void * __REDIRECT (mmap,

                              (void *__addr, size_t __len, int __prot,

                               int __flags, int __fd, __off64_t __offset),

                              mmap64);

# else

#  define mmap mmap64

# endif

#endif

#ifdef __USE_LARGEFILE64

extern void *mmap64 (void *__addr, size_t __len, int __prot,

                     int __flags, int __fd, __off64_t __offset) __THROW;

#endif

/* Deallocate any mapping for the region starting at ADDR and extending LEN

   bytes.  Returns 0 if successful, -1 for errors (and sets errno).  */

extern int munmap (void *__addr, size_t __len) __THROW;

/* Change the memory protection of the region starting at ADDR and

   extending LEN bytes to PROT.  Returns 0 if successful, -1 for errors

   (and sets errno).  */

extern int mprotect (void *__addr, size_t __len, int __prot) __THROW;

#ifdef __ARCH_USE_MMU__

/* Synchronize the region starting at ADDR and extending LEN bytes with the

   file it maps.  Filesystem operations on a file being mapped are

   unpredictable before this is done.  Flags are from the MS_* set.

   This function is a cancellation point and therefore not marked with

   __THROW.  */

extern int msync (void *__addr, size_t __len, int __flags);

#else

/* On no-mmu systems you can't have real private mappings.  */

static inline int msync (void *__addr, size_t __len, int __flags) { return 0; }

#endif

#ifdef __USE_BSD

/* Advise the system about particular usage patterns the program follows

   for the region starting at ADDR and extending LEN bytes.  */

extern int madvise (void *__addr, size_t __len, int __advice) __THROW;

#endif

#ifdef __USE_XOPEN2K

/* This is the POSIX name for this function.  */

extern int posix_madvise (void *__addr, size_t __len, int __advice) __THROW;

#endif

#ifdef __ARCH_USE_MMU__

/* Guarantee all whole pages mapped by the range [ADDR,ADDR+LEN) to

   be memory resident.  */

extern int mlock (__const void *__addr, size_t __len) __THROW;

/* Unlock whole pages previously mapped by the range [ADDR,ADDR+LEN).  */

extern int munlock (__const void *__addr, size_t __len) __THROW;

/* Cause all currently mapped pages of the process to be memory resident

   until unlocked by a call to the `munlockall', until the process exits,

   or until the process calls `execve'.  */

extern int mlockall (int __flags) __THROW;

/* All currently mapped pages of the process' address space become

   unlocked.  */

extern int munlockall (void) __THROW;

#else

/* On no-mmu systems, memory cannot be swapped out, so

 * these functions will always succeed.  */

static inline int mlock (__const void *__addr, size_t __len) { return 0; }

static inline int munlock (__const void *__addr, size_t __len) { return 0; }

static inline int mlockall (int __flags) { return 0; }

static inline int munlockall (void) { return 0; }

#endif

#ifdef __USE_MISC

/* Remap pages mapped by the range [ADDR,ADDR+OLD_LEN) to new length

   NEW_LEN.  If MREMAP_MAYMOVE is set in FLAGS the returned address

   may differ from ADDR.  If MREMAP_FIXED is set in FLAGS the function

   takes another paramter which is a fixed address at which the block

   resides after a successful call.  */

extern void *mremap (void *__addr, size_t __old_len, size_t __new_len,

                     int __flags, ...) __THROW;

/* mincore returns the memory residency status of the pages in the

   current process's address space specified by [start, start + len).

   The status is returned in a vector of bytes.  The least significant

   bit of each byte is 1 if the referenced page is in memory, otherwise

   it is zero.  */

extern int mincore (void *__start, size_t __len, unsigned char *__vec)

     __THROW;

#if 0

/* Remap arbitrary pages of a shared backing store within an existing

   VMA.  */

extern int remap_file_pages (void *__start, size_t __size, int __prot,

                             size_t __pgoff, int __flags) __THROW;

#endif

#endif

/* Open shared memory segment.  */

extern int shm_open (__const char *__name, int __oflag, mode_t __mode);

/* Remove shared memory segment.  */

extern int shm_unlink (__const char *__name);

__END_DECLS

#endif  /* sys/mman.h */