glibc (2.38)
1 /* Memory-mapping-related declarations/definitions, not architecture-specific.
2 Copyright (C) 2017-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
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.
9
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.
14
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 <https://www.gnu.org/licenses/>. */
18
19 #ifndef _SYS_MMAN_H
20 # error "Never use <bits/mman-shared.h> directly; include <sys/mman.h> instead."
21 #endif
22
23 #ifdef __USE_GNU
24 /* Flags for mremap. */
25 # define MREMAP_MAYMOVE 1
26 # define MREMAP_FIXED 2
27 # define MREMAP_DONTUNMAP 4
28
29 /* Flags for memfd_create. */
30 # ifndef MFD_CLOEXEC
31 # define MFD_CLOEXEC 1U
32 # define MFD_ALLOW_SEALING 2U
33 # define MFD_HUGETLB 4U
34 # endif
35 # ifndef MFD_NOEXEC_SEAL
36 # define MFD_NOEXEC_SEAL 8U
37 # define MFD_EXEC 0x10U
38 # endif
39
40 /* Flags for mlock2. */
41 # ifndef MLOCK_ONFAULT
42 # define MLOCK_ONFAULT 1U
43 # endif
44
45 /* Access rights for pkey_alloc. */
46 # ifndef PKEY_DISABLE_ACCESS
47 # define PKEY_DISABLE_ACCESS 0x1
48 # define PKEY_DISABLE_WRITE 0x2
49 # endif
50
51 __BEGIN_DECLS
52
53 /* Create a new memory file descriptor. NAME is a name for debugging.
54 FLAGS is a combination of the MFD_* constants. */
55 int memfd_create (const char *__name, unsigned int __flags) __THROW;
56
57 /* Lock pages from ADDR (inclusive) to ADDR + LENGTH (exclusive) into
58 memory. FLAGS is a combination of the MLOCK_* flags above. */
59 int mlock2 (const void *__addr, size_t __length, unsigned int __flags) __THROW;
60
61 /* Allocate a new protection key, with the PKEY_DISABLE_* bits
62 specified in ACCESS_RIGHTS. The protection key mask for the
63 current thread is updated to match the access privilege for the new
64 key. */
65 int pkey_alloc (unsigned int __flags, unsigned int __access_rights) __THROW;
66
67 /* Update the access rights for the current thread for KEY, which must
68 have been allocated using pkey_alloc. */
69 int pkey_set (int __key, unsigned int __access_rights) __THROW;
70
71 /* Return the access rights for the current thread for KEY, which must
72 have been allocated using pkey_alloc. */
73 int pkey_get (int __key) __THROW;
74
75 /* Free an allocated protection key, which must have been allocated
76 using pkey_alloc. */
77 int pkey_free (int __key) __THROW;
78
79 /* Apply memory protection flags for KEY to the specified address
80 range. */
81 int pkey_mprotect (void *__addr, size_t __len, int __prot, int __pkey) __THROW;
82
83 __END_DECLS
84
85 #endif /* __USE_GNU */
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