| 1 | /* Memory-mapping-related declarations/definitions, not architecture-specific. |
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| 2 | Copyright (C) 2017-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef _SYS_MMAN_H |
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| 20 | # error "Never use <bits/mman-shared.h> directly; include <sys/mman.h> instead." |
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| 21 | #endif |
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| 22 | |
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| 23 | #ifdef __USE_GNU |
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| 24 | /* Flags for mremap. */ |
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| 25 | # define MREMAP_MAYMOVE 1 |
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| 26 | # define MREMAP_FIXED 2 |
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| 27 | # define MREMAP_DONTUNMAP 4 |
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| 28 | |
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| 29 | /* Flags for memfd_create. */ |
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| 30 | # ifndef MFD_CLOEXEC |
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| 31 | # define MFD_CLOEXEC 1U |
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| 32 | # define MFD_ALLOW_SEALING 2U |
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| 33 | # define MFD_HUGETLB 4U |
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| 34 | # endif |
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| 35 | |
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| 36 | /* Flags for mlock2. */ |
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| 37 | # ifndef MLOCK_ONFAULT |
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| 38 | # define MLOCK_ONFAULT 1U |
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| 39 | # endif |
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| 40 | |
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| 41 | /* Access rights for pkey_alloc. */ |
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| 42 | # ifndef PKEY_DISABLE_ACCESS |
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| 43 | # define PKEY_DISABLE_ACCESS 0x1 |
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| 44 | # define PKEY_DISABLE_WRITE 0x2 |
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| 45 | # endif |
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| 46 | |
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| 47 | __BEGIN_DECLS |
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| 48 | |
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| 49 | /* Create a new memory file descriptor. NAME is a name for debugging. |
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| 50 | FLAGS is a combination of the MFD_* constants. */ |
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| 51 | int memfd_create (const char *__name, unsigned int __flags) __THROW; |
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| 52 | |
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| 53 | /* Lock pages from ADDR (inclusive) to ADDR + LENGTH (exclusive) into |
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| 54 | memory. FLAGS is a combination of the MLOCK_* flags above. */ |
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| 55 | int mlock2 (const void *__addr, size_t __length, unsigned int __flags) __THROW; |
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| 56 | |
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| 57 | /* Allocate a new protection key, with the PKEY_DISABLE_* bits |
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| 58 | specified in ACCESS_RIGHTS. The protection key mask for the |
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| 59 | current thread is updated to match the access privilege for the new |
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| 60 | key. */ |
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| 61 | int pkey_alloc (unsigned int __flags, unsigned int __access_rights) __THROW; |
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| 62 | |
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| 63 | /* Update the access rights for the current thread for KEY, which must |
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| 64 | have been allocated using pkey_alloc. */ |
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| 65 | int pkey_set (int __key, unsigned int __access_rights) __THROW; |
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| 66 | |
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| 67 | /* Return the access rights for the current thread for KEY, which must |
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| 68 | have been allocated using pkey_alloc. */ |
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| 69 | int pkey_get (int __key) __THROW; |
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| 70 | |
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| 71 | /* Free an allocated protection key, which must have been allocated |
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| 72 | using pkey_alloc. */ |
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| 73 | int pkey_free (int __key) __THROW; |
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| 74 | |
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| 75 | /* Apply memory protection flags for KEY to the specified address |
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| 76 | range. */ |
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| 77 | int pkey_mprotect (void *__addr, size_t __len, int __prot, int __pkey) __THROW; |
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| 78 | |
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| 79 | __END_DECLS |
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| 80 | |
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| 81 | #endif /* __USE_GNU */ |
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| 82 | |
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