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/* Memory-mapping-related declarations/definitions, not architecture-specific.
Copyright (C) 2017-2020 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, see
<https://www.gnu.org/licenses/>. */
#ifndef _SYS_MMAN_H
# error "Never use <bits/mman-shared.h> directly; include <sys/mman.h> instead."
#endif
#ifdef __USE_GNU
/* Flags for mremap. */
# define MREMAP_MAYMOVE 1
# define MREMAP_FIXED 2
# define MREMAP_DONTUNMAP 4
/* Flags for memfd_create. */
# ifndef MFD_CLOEXEC
# define MFD_CLOEXEC 1U
# define MFD_ALLOW_SEALING 2U
# define MFD_HUGETLB 4U
# endif
/* Flags for mlock2. */
# ifndef MLOCK_ONFAULT
# define MLOCK_ONFAULT 1U
# endif
/* Access rights for pkey_alloc. */
# ifndef PKEY_DISABLE_ACCESS
# define PKEY_DISABLE_ACCESS 0x1
# define PKEY_DISABLE_WRITE 0x2
# endif
__BEGIN_DECLS
/* Create a new memory file descriptor. NAME is a name for debugging.
FLAGS is a combination of the MFD_* constants. */
int memfd_create (const char *__name, unsigned int __flags) __THROW;
/* Lock pages from ADDR (inclusive) to ADDR + LENGTH (exclusive) into
memory. FLAGS is a combination of the MLOCK_* flags above. */
int mlock2 (const void *__addr, size_t __length, unsigned int __flags) __THROW;
/* Allocate a new protection key, with the PKEY_DISABLE_* bits
specified in ACCESS_RIGHTS. The protection key mask for the
current thread is updated to match the access privilege for the new
key. */
int pkey_alloc (unsigned int __flags, unsigned int __access_rights) __THROW;
/* Update the access rights for the current thread for KEY, which must
have been allocated using pkey_alloc. */
int pkey_set (int __key, unsigned int __access_rights) __THROW;
/* Return the access rights for the current thread for KEY, which must
have been allocated using pkey_alloc. */
int pkey_get (int __key) __THROW;
/* Free an allocated protection key, which must have been allocated
using pkey_alloc. */
int pkey_free (int __key) __THROW;
/* Apply memory protection flags for KEY to the specified address
range. */
int pkey_mprotect (void *__addr, size_t __len, int __prot, int __pkey) __THROW;
__END_DECLS
#endif /* __USE_GNU */
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