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152 lines
5.4 KiB
C
152 lines
5.4 KiB
C
/* 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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