104 lines
4.1 KiB
C
104 lines
4.1 KiB
C
/* Definitions for POSIX-style memory management. Linux version.
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Copyright (C) 1994, 1995, 1996, 1997, 1998 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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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/* Get the bit values from the kernel header file. */
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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 ((__ptr_t) -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 __ptr_t mmap __P ((__ptr_t __addr, size_t __len, int __prot,
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int __flags, int __fd, __off_t __offset));
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#else
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extern __ptr_t mmap __P ((__ptr_t __addr, size_t __len, int __prot,
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int __flags, int __fd, __off64_t __offset))
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__asm__ ("mmap64");
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#endif
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#ifdef __USE_LARGEFILE64
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extern __ptr_t mmap64 __P ((__ptr_t __addr, size_t __len, int __prot,
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int __flags, int __fd, __off64_t __offset));
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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 __P ((__ptr_t __addr, size_t __len));
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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 __P ((__ptr_t __addr, size_t __len, int __prot));
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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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extern int msync __P ((__ptr_t __addr, size_t __len, int __flags));
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#ifdef __USE_BSD
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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 __P ((__ptr_t __addr, size_t __len, int __advice));
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#endif
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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 __P ((int __flags));
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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 __P ((void));
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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 __P ((__const __ptr_t __addr, size_t __len));
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/* Unlock whole pages previously mapped by the range [ADDR,ADDR+LEN). */
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extern int munlock __P ((__const __ptr_t __addr, size_t __len));
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#ifdef __USE_MISC
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/* Remap pages mapped by the range [ADDR,ADDR+OLD_LEN) to new length
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NEW_LEN. If MAY_MOVE is MREMAP_MAYMOVE the returned address may
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differ from ADDR. */
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extern __ptr_t mremap __P ((__ptr_t __addr, size_t __old_len,
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size_t __new_len, int __may_move));
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#endif
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__END_DECLS
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#endif /* _SYS_MMAN_H */
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