diff options
Diffstat (limited to 'libc/sysdeps/linux/common/bits/mman-linux.h')
| -rw-r--r-- | libc/sysdeps/linux/common/bits/mman-linux.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/common/bits/mman-linux.h b/libc/sysdeps/linux/common/bits/mman-linux.h new file mode 100644 index 000000000..6ca08415a --- /dev/null +++ b/libc/sysdeps/linux/common/bits/mman-linux.h @@ -0,0 +1,117 @@ +/* Definitions for POSIX memory map interface. Linux generic version. + Copyright (C) 2001-2018 Free Software Foundation, Inc. + + 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_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 + +/* only define for MMU targets, no-MMU does not support madvise. */ +#ifdef __ARCH_USE_MMU__ +/* 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 +#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> |