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1 | /* Memory-mapping-related declarations/definitions, not architecture-specific. | |
2 | Copyright (C) 2017-2024 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 */ |