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mman-linux.h
/* Definitions for POSIX memory map interface. Linux generic version. Copyright (C) 2001-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _SYS_MMAN_H # error "Never use <bits/mman-linux.h> directly; include <sys/mman.h> instead." #endif /* The following definitions basically come from the kernel headers. But the kernel header is not namespace clean. */ /* Protections are chosen from these bits, OR'd together. The implementation does not necessarily support PROT_EXEC or PROT_WRITE without PROT_READ. The only guarantees are that no writing will be allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */ #define PROT_READ 0x1 /* Page can be read. */ #define PROT_WRITE 0x2 /* Page can be written. */ #define PROT_EXEC 0x4 /* Page can be executed. */ #define PROT_NONE 0x0 /* Page can not be accessed. */ #define PROT_GROWSDOWN 0x01000000 /* Extend change to start of growsdown vma (mprotect only). */ #define PROT_GROWSUP 0x02000000 /* Extend change to start of growsup vma (mprotect only). */ /* Sharing types (must choose one and only one of these). */ #define MAP_SHARED 0x01 /* Share changes. */ #define MAP_PRIVATE 0x02 /* Changes are private. */ #ifdef __USE_MISC # define MAP_SHARED_VALIDATE 0x03 /* Share changes and validate extension flags. */ # define MAP_TYPE 0x0f /* Mask for type of mapping. */ #endif /* Other flags. */ #define MAP_FIXED 0x10 /* Interpret addr exactly. */ #ifdef __USE_MISC # define MAP_FILE 0 # ifdef __MAP_ANONYMOUS # define MAP_ANONYMOUS __MAP_ANONYMOUS /* Don't use a file. */ # else # define MAP_ANONYMOUS 0x20 /* Don't use a file. */ # endif # define MAP_ANON MAP_ANONYMOUS /* When MAP_HUGETLB is set bits [26:31] encode the log2 of the huge page size. */ # define MAP_HUGE_SHIFT 26 # define MAP_HUGE_MASK 0x3f #endif /* Flags to `msync'. */ #define MS_ASYNC 1 /* Sync memory asynchronously. */ #define MS_SYNC 4 /* Synchronous memory sync. */ #define MS_INVALIDATE 2 /* Invalidate the caches. */ /* Flags for `mremap'. */ #ifdef __USE_GNU # define MREMAP_MAYMOVE 1 # define MREMAP_FIXED 2 #endif /* Advice to `madvise'. */ #ifdef __USE_MISC # define MADV_NORMAL 0 /* No further special treatment. */ # define MADV_RANDOM 1 /* Expect random page references. */ # define MADV_SEQUENTIAL 2 /* Expect sequential page references. */ # define MADV_WILLNEED 3 /* Will need these pages. */ # define MADV_DONTNEED 4 /* Don't need these pages. */ # define MADV_FREE 8 /* Free pages only if memory pressure. */ # define MADV_REMOVE 9 /* Remove these pages and resources. */ # define MADV_DONTFORK 10 /* Do not inherit across fork. */ # define MADV_DOFORK 11 /* Do inherit across fork. */ # define MADV_MERGEABLE 12 /* KSM may merge identical pages. */ # define MADV_UNMERGEABLE 13 /* KSM may not merge identical pages. */ # define MADV_HUGEPAGE 14 /* Worth backing with hugepages. */ # define MADV_NOHUGEPAGE 15 /* Not worth backing with hugepages. */ # define MADV_DONTDUMP 16 /* Explicity exclude from the core dump, overrides the coredump filter bits. */ # define MADV_DODUMP 17 /* Clear the MADV_DONTDUMP flag. */ # define MADV_WIPEONFORK 18 /* Zero memory on fork, child only. */ # define MADV_KEEPONFORK 19 /* Undo MADV_WIPEONFORK. */ # define MADV_HWPOISON 100 /* Poison a page for testing. */ #endif /* The POSIX people had to invent similar names for the same things. */ #ifdef __USE_XOPEN2K # define POSIX_MADV_NORMAL 0 /* No further special treatment. */ # define POSIX_MADV_RANDOM 1 /* Expect random page references. */ # define POSIX_MADV_SEQUENTIAL 2 /* Expect sequential page references. */ # define POSIX_MADV_WILLNEED 3 /* Will need these pages. */ # define POSIX_MADV_DONTNEED 4 /* Don't need these pages. */ #endif /* Flags for `mlockall'. */ #ifndef MCL_CURRENT # define MCL_CURRENT 1 /* Lock all currently mapped pages. */ # define MCL_FUTURE 2 /* Lock all additions to address space. */ # define MCL_ONFAULT 4 /* Lock all pages that are faulted in. */ #endif #include <bits/mman-shared.h>
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