mman.h
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上传日期:2009-04-28
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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_NTH
- extern void * __REDIRECT_NTH (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;
- /* 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);
- #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
- /* 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;
- #ifdef __USE_MISC
- /* Remap pages mapped by the range [ADDR,ADDR+OLD_LEN) to new length
- NEW_LEN. If MAY_MOVE is MREMAP_MAYMOVE the returned address may
- differ from ADDR. */
- extern void *mremap (void *__addr, size_t __old_len, size_t __new_len,
- int __may_move) __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;
- /* 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
- /* 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 */