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114 lines
4.8 KiB
C
114 lines
4.8 KiB
C
/* Definitions for POSIX memory map interface. Linux generic version.
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Copyright (C) 2001-2020 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-linux.h> directly; include <sys/mman.h> instead."
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#endif
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/* The following definitions basically come from the kernel headers.
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But the kernel header is not namespace clean. */
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/* Protections are chosen from these bits, OR'd together. The
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implementation does not necessarily support PROT_EXEC or PROT_WRITE
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without PROT_READ. The only guarantees are that no writing will be
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allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
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#define PROT_READ 0x1 /* Page can be read. */
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#define PROT_WRITE 0x2 /* Page can be written. */
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#define PROT_EXEC 0x4 /* Page can be executed. */
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#define PROT_NONE 0x0 /* Page can not be accessed. */
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#define PROT_GROWSDOWN 0x01000000 /* Extend change to start of
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growsdown vma (mprotect only). */
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#define PROT_GROWSUP 0x02000000 /* Extend change to start of
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growsup vma (mprotect only). */
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/* Sharing types (must choose one and only one of these). */
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#define MAP_SHARED 0x01 /* Share changes. */
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#define MAP_PRIVATE 0x02 /* Changes are private. */
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#ifdef __USE_MISC
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# define MAP_SHARED_VALIDATE 0x03 /* Share changes and validate
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extension flags. */
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# define MAP_TYPE 0x0f /* Mask for type of mapping. */
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#endif
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/* Other flags. */
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#define MAP_FIXED 0x10 /* Interpret addr exactly. */
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#ifdef __USE_MISC
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# define MAP_FILE 0
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# ifdef __MAP_ANONYMOUS
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# define MAP_ANONYMOUS __MAP_ANONYMOUS /* Don't use a file. */
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# else
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# define MAP_ANONYMOUS 0x20 /* Don't use a file. */
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# endif
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# define MAP_ANON MAP_ANONYMOUS
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/* When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size. */
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# define MAP_HUGE_SHIFT 26
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# define MAP_HUGE_MASK 0x3f
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#endif
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/* Flags to `msync'. */
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#define MS_ASYNC 1 /* Sync memory asynchronously. */
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#define MS_SYNC 4 /* Synchronous memory sync. */
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#define MS_INVALIDATE 2 /* Invalidate the caches. */
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/* Advice to `madvise'. */
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#ifdef __USE_MISC
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# define MADV_NORMAL 0 /* No further special treatment. */
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# define MADV_RANDOM 1 /* Expect random page references. */
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# define MADV_SEQUENTIAL 2 /* Expect sequential page references. */
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# define MADV_WILLNEED 3 /* Will need these pages. */
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# define MADV_DONTNEED 4 /* Don't need these pages. */
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# define MADV_FREE 8 /* Free pages only if memory pressure. */
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# define MADV_REMOVE 9 /* Remove these pages and resources. */
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# define MADV_DONTFORK 10 /* Do not inherit across fork. */
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# define MADV_DOFORK 11 /* Do inherit across fork. */
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# define MADV_MERGEABLE 12 /* KSM may merge identical pages. */
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# define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages. */
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# define MADV_HUGEPAGE 14 /* Worth backing with hugepages. */
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# define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages. */
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# define MADV_DONTDUMP 16 /* Explicity exclude from the core dump,
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overrides the coredump filter bits. */
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# define MADV_DODUMP 17 /* Clear the MADV_DONTDUMP flag. */
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# define MADV_WIPEONFORK 18 /* Zero memory on fork, child only. */
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# define MADV_KEEPONFORK 19 /* Undo MADV_WIPEONFORK. */
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# define MADV_COLD 20 /* Deactivate these pages. */
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# define MADV_PAGEOUT 21 /* Reclaim these pages. */
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# define MADV_HWPOISON 100 /* Poison a page for testing. */
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#endif
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/* The POSIX people had to invent similar names for the same things. */
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#ifdef __USE_XOPEN2K
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# define POSIX_MADV_NORMAL 0 /* No further special treatment. */
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# define POSIX_MADV_RANDOM 1 /* Expect random page references. */
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# define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */
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# define POSIX_MADV_WILLNEED 3 /* Will need these pages. */
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# define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */
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#endif
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/* Flags for `mlockall'. */
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#ifndef MCL_CURRENT
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# define MCL_CURRENT 1 /* Lock all currently mapped pages. */
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# define MCL_FUTURE 2 /* Lock all additions to address
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space. */
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# define MCL_ONFAULT 4 /* Lock all pages that are
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faulted in. */
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#endif
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#include <bits/mman-shared.h>
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