| 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 */ |
|---|
| 86 | |
|---|
