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01bb997ef5
A corresponding macro has been added to Linux UAPI headers in 6.15. Reviewed-by: Florian Weimer <fweimer@redhat.com>
86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
/* Memory-mapping-related declarations/definitions, not architecture-specific.
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Copyright (C) 2017-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _SYS_MMAN_H
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# error "Never use <bits/mman-shared.h> directly; include <sys/mman.h> instead."
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#endif
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#ifdef __USE_GNU
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/* Flags for mremap. */
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# define MREMAP_MAYMOVE 1
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# define MREMAP_FIXED 2
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# define MREMAP_DONTUNMAP 4
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/* Flags for memfd_create. */
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# ifndef MFD_CLOEXEC
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# define MFD_CLOEXEC 1U
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# define MFD_ALLOW_SEALING 2U
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# define MFD_HUGETLB 4U
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# endif
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# ifndef MFD_NOEXEC_SEAL
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# define MFD_NOEXEC_SEAL 8U
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# define MFD_EXEC 0x10U
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# endif
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/* Flags for mlock2. */
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# ifndef MLOCK_ONFAULT
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# define MLOCK_ONFAULT 1U
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# endif
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/* Access restrictions for pkey_alloc. */
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# define PKEY_UNRESTRICTED 0x0
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# define PKEY_DISABLE_ACCESS 0x1
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# define PKEY_DISABLE_WRITE 0x2
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__BEGIN_DECLS
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/* Create a new memory file descriptor. NAME is a name for debugging.
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FLAGS is a combination of the MFD_* constants. */
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int memfd_create (const char *__name, unsigned int __flags) __THROW;
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/* Lock pages from ADDR (inclusive) to ADDR + LENGTH (exclusive) into
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memory. FLAGS is a combination of the MLOCK_* flags above. */
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int mlock2 (const void *__addr, size_t __length, unsigned int __flags) __THROW
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__attr_access_none (1);
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/* Allocate a new protection key, with the PKEY_DISABLE_* bits
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specified in ACCESS_RESTRICTIONS. The protection key mask for the
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current thread is updated to match the access privilege for the new
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key. */
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int pkey_alloc (unsigned int __flags, unsigned int __access_restrictions) __THROW;
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/* Update the access restrictions for the current thread for KEY, which must
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have been allocated using pkey_alloc. */
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int pkey_set (int __key, unsigned int __access_restrictions) __THROW;
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/* Return the access restrictions for the current thread for KEY, which must
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have been allocated using pkey_alloc. */
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int pkey_get (int __key) __THROW;
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/* Free an allocated protection key, which must have been allocated
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using pkey_alloc. */
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int pkey_free (int __key) __THROW;
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/* Apply memory protection flags for KEY to the specified address
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range. */
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int pkey_mprotect (void *__addr, size_t __len, int __prot, int __pkey) __THROW;
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__END_DECLS
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#endif /* __USE_GNU */
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