1/* Memory-mapping-related declarations/definitions, not architecture-specific.
 2   Copyright (C) 2017-2025 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 restrictions for pkey_alloc.  */
46# define PKEY_UNRESTRICTED 0x0
47# define PKEY_DISABLE_ACCESS 0x1
48# define PKEY_DISABLE_WRITE 0x2
49
50__BEGIN_DECLS
51
52// zig patch: check target glibc version
53# if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 27) || __GLIBC__ > 2
54
55/* Create a new memory file descriptor.  NAME is a name for debugging.
56   FLAGS is a combination of the MFD_* constants.  */
57int memfd_create (const char *__name, unsigned int __flags) __THROW;
58
59/* Lock pages from ADDR (inclusive) to ADDR + LENGTH (exclusive) into
60   memory.  FLAGS is a combination of the MLOCK_* flags above.  */
61int mlock2 (const void *__addr, size_t __length, unsigned int __flags) __THROW
62    __attr_access_none (1);
63
64#endif /* if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 27) || __GLIBC__ > 2 */
65
66/* Allocate a new protection key, with the PKEY_DISABLE_* bits
67   specified in ACCESS_RESTRICTIONS.  The protection key mask for the
68   current thread is updated to match the access privilege for the new
69   key.  */
70int pkey_alloc (unsigned int __flags, unsigned int __access_restrictions) __THROW;
71
72/* Update the access restrictions for the current thread for KEY, which must
73   have been allocated using pkey_alloc.  */
74int pkey_set (int __key, unsigned int __access_restrictions) __THROW;
75
76/* Return the access restrictions for the current thread for KEY, which must
77   have been allocated using pkey_alloc.  */
78int pkey_get (int __key) __THROW;
79
80/* Free an allocated protection key, which must have been allocated
81   using pkey_alloc.  */
82int pkey_free (int __key) __THROW;
83
84/* Apply memory protection flags for KEY to the specified address
85   range.  */
86int pkey_mprotect (void *__addr, size_t __len, int __prot, int __pkey) __THROW;
87
88__END_DECLS
89
90#endif /* __USE_GNU */