1 | /* Memory-mapping-related declarations/definitions, not architecture-specific. |
2 | Copyright (C) 2017-2022 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 | |
36 | /* Flags for mlock2. */ |
37 | # ifndef MLOCK_ONFAULT |
38 | # define MLOCK_ONFAULT 1U |
39 | # endif |
40 | |
41 | /* Access rights for pkey_alloc. */ |
42 | # ifndef PKEY_DISABLE_ACCESS |
43 | # define PKEY_DISABLE_ACCESS 0x1 |
44 | # define PKEY_DISABLE_WRITE 0x2 |
45 | # endif |
46 | |
47 | __BEGIN_DECLS |
48 | |
49 | /* Create a new memory file descriptor. NAME is a name for debugging. |
50 | FLAGS is a combination of the MFD_* constants. */ |
51 | int memfd_create (const char *__name, unsigned int __flags) __THROW; |
52 | |
53 | /* Lock pages from ADDR (inclusive) to ADDR + LENGTH (exclusive) into |
54 | memory. FLAGS is a combination of the MLOCK_* flags above. */ |
55 | int mlock2 (const void *__addr, size_t __length, unsigned int __flags) __THROW; |
56 | |
57 | /* Allocate a new protection key, with the PKEY_DISABLE_* bits |
58 | specified in ACCESS_RIGHTS. The protection key mask for the |
59 | current thread is updated to match the access privilege for the new |
60 | key. */ |
61 | int pkey_alloc (unsigned int __flags, unsigned int __access_rights) __THROW; |
62 | |
63 | /* Update the access rights for the current thread for KEY, which must |
64 | have been allocated using pkey_alloc. */ |
65 | int pkey_set (int __key, unsigned int __access_rights) __THROW; |
66 | |
67 | /* Return the access rights for the current thread for KEY, which must |
68 | have been allocated using pkey_alloc. */ |
69 | int pkey_get (int __key) __THROW; |
70 | |
71 | /* Free an allocated protection key, which must have been allocated |
72 | using pkey_alloc. */ |
73 | int pkey_free (int __key) __THROW; |
74 | |
75 | /* Apply memory protection flags for KEY to the specified address |
76 | range. */ |
77 | int pkey_mprotect (void *__addr, size_t __len, int __prot, int __pkey) __THROW; |
78 | |
79 | __END_DECLS |
80 | |
81 | #endif /* __USE_GNU */ |
82 | |