/* Definitions for BSD-style memory management.

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Copyright (C) 1994-2018 Free Software Foundation, Inc.

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This file is part of the GNU C Library.

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The GNU C Library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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version 2.1 of the License, or (at your option) any later version.

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The GNU C Library is distributed in the hope that it will be useful,

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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Lesser General Public License for more details.

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You should have received a copy of the GNU Lesser General Public

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License along with the GNU C Library; if not, see

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<http://www.gnu.org/licenses/>. */

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#ifndef _SYS_MMAN_H

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#define _SYS_MMAN_H 1

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#include <features.h>

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#include <bits/types.h>

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#define __need_size_t

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#include <stddef.h>

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#ifndef __off_t_defined

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# ifndef __USE_FILE_OFFSET64

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typedef __off_t off_t;

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# else

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typedef __off64_t off_t;

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# endif

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# define __off_t_defined

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#endif

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#ifndef __mode_t_defined

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typedef __mode_t mode_t;

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# define __mode_t_defined

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#endif

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#include <bits/mman.h>

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

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#define MAP_FAILED ((void *) -1)

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__BEGIN_DECLS

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

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

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

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

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

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The return value is the actual mapping address chosen or MAP_FAILED

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

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deallocates any previous mapping for the affected region. */

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#ifndef __USE_FILE_OFFSET64

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

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int __flags, int __fd, __off_t __offset) __THROW;

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#else

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# ifdef __REDIRECT_NTH

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extern void * __REDIRECT_NTH (mmap,

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(void *__addr, size_t __len, int __prot,

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int __flags, int __fd, __off64_t __offset),

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mmap64);

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# else

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# define mmap mmap64

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# endif

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#endif

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#ifdef __USE_LARGEFILE64

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

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int __flags, int __fd, __off64_t __offset) __THROW;

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#endif

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

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

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

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

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

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(and sets errno). */

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

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

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

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

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This function is a cancellation point and therefore not marked with

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__THROW. */

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

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#ifdef __USE_MISC

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

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

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

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#endif

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#ifdef __USE_XOPEN2K

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

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

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#endif

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

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be memory resident. */

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

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

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

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

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

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or until the process calls `execve'. */

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extern int mlockall (int __flags) __THROW;

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

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unlocked. */

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extern int munlockall (void) __THROW;

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#ifdef __USE_MISC

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

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

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

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

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it is zero. */

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

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__THROW;

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#endif

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#ifdef __USE_GNU

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

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NEW_LEN. If MREMAP_MAYMOVE is set in FLAGS the returned address

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

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

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resides after a successful call. */

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

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int __flags, ...) __THROW;

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

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VMA. */

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

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size_t __pgoff, int __flags) __THROW;

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#endif

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/* Open shared memory segment. */

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

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/* Remove shared memory segment. */

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extern int shm_unlink (const char *__name);

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__END_DECLS

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#endif /* sys/mman.h */

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