1 /* Memory-mapping-related declarations/definitions, not architecture-specific.
2 Copyright (C) 2017-2018 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
20 # error "Never use <bits/mman-shared.h> directly; include <sys/mman.h> instead."
24 /* Flags for memfd_create. */
26 # define MFD_CLOEXEC 1U
27 # define MFD_ALLOW_SEALING 2U
28 # define MFD_HUGETLB 4U
31 /* Flags for mlock2. */
32 # ifndef MLOCK_ONFAULT
33 # define MLOCK_ONFAULT 1U
36 /* Access rights for pkey_alloc. */
37 # ifndef PKEY_DISABLE_ACCESS
38 # define PKEY_DISABLE_ACCESS 0x1
39 # define PKEY_DISABLE_WRITE 0x2
44 /* Create a new memory file descriptor. NAME is a name for debugging.
45 FLAGS is a combination of the MFD_* constants. */
46 int memfd_create (const char *__name, unsigned int __flags) __THROW;
48 /* Lock pages from ADDR (inclusive) to ADDR + LENGTH (exclusive) into
49 memory. FLAGS is a combination of the MLOCK_* flags above. */
50 int mlock2 (const void *__addr, size_t __length, unsigned int __flags) __THROW;
52 /* Allocate a new protection key, with the PKEY_DISABLE_* bits
53 specified in ACCESS_RIGHTS. The protection key mask for the
54 current thread is updated to match the access privilege for the new
56 int pkey_alloc (unsigned int __flags, unsigned int __access_rights) __THROW;
58 /* Update the access rights for the current thread for KEY, which must
59 have been allocated using pkey_alloc. */
60 int pkey_set (int __key, unsigned int __access_rights) __THROW;
62 /* Return the access rights for the current thread for KEY, which must
63 have been allocated using pkey_alloc. */
64 int pkey_get (int __key) __THROW;
66 /* Free an allocated protection key, which must have been allocated
68 int pkey_free (int __key) __THROW;
70 /* Apply memory protection flags for KEY to the specified address
72 int pkey_mprotect (void *__addr, size_t __len, int __prot, int __pkey) __THROW;
76 #endif /* __USE_GNU */