95c6cd753f
Historically we've made a few mistakes where they haven't matched the right number. And most non-Googlers are much more familiar with the numbers, so it seems to make sense to rely more on them. Especially in header files, which we actually expect real people to have to read from time to time. Test: treehugger Change-Id: I0d4a97454ee108de1d32f21df285315c5488d886
212 lines
6.9 KiB
C
212 lines
6.9 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#pragma once
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <linux/memfd.h>
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#include <linux/mman.h>
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__BEGIN_DECLS
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/** Alternative spelling of the `MAP_ANONYMOUS` flag for mmap(). */
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#define MAP_ANON MAP_ANONYMOUS
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/** Return value for mmap(). */
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#define MAP_FAILED __BIONIC_CAST(reinterpret_cast, void*, -1)
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/**
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* [mmap(2)](http://man7.org/linux/man-pages/man2/mmap.2.html)
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* creates a memory mapping for the given range.
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*
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* Returns the address of the mapping on success,
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* and returns `MAP_FAILED` and sets `errno` on failure.
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*/
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#if defined(__USE_FILE_OFFSET64)
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void* mmap(void* __addr, size_t __size, int __prot, int __flags, int __fd, off_t __offset) __RENAME(mmap64);
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#else
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void* mmap(void* __addr, size_t __size, int __prot, int __flags, int __fd, off_t __offset);
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#endif
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#if __ANDROID_API__ >= 21
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/**
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* mmap64() is a variant of mmap() that takes a 64-bit offset even on LP32.
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*
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* See https://android.googlesource.com/platform/bionic/+/master/docs/32-bit-abi.md
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*
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* mmap64 wasn't really around until L, but we added an inline for it since it
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* allows a lot more code to compile with _FILE_OFFSET_BITS=64.
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*/
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void* mmap64(void* __addr, size_t __size, int __prot, int __flags, int __fd, off64_t __offset) __INTRODUCED_IN(21);
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#endif
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/**
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* [munmap(2)](http://man7.org/linux/man-pages/man2/munmap.2.html)
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* deletes a memory mapping for the given range.
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*
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* Returns 0 on success, and returns -1 and sets `errno` on failure.
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*/
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int munmap(void* __addr, size_t __size);
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/**
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* [msync(2)](http://man7.org/linux/man-pages/man2/msync.2.html)
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* flushes changes to a memory-mapped file to disk.
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*
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* Returns 0 on success, and returns -1 and sets `errno` on failure.
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*/
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int msync(void* __addr, size_t __size, int __flags);
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/**
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* [mprotect(2)](http://man7.org/linux/man-pages/man2/mprotect.2.html)
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* sets the protection on a memory region.
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*
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* Returns 0 on success, and returns -1 and sets `errno` on failure.
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*/
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int mprotect(void* __addr, size_t __size, int __prot);
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/** Flag for mremap(). */
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#define MREMAP_MAYMOVE 1
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/** Flag for mremap(). */
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#define MREMAP_FIXED 2
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/**
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* [mremap(2)](http://man7.org/linux/man-pages/man2/mremap.2.html)
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* expands or shrinks an existing memory mapping.
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*
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* Returns the address of the mapping on success,
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* and returns `MAP_FAILED` and sets `errno` on failure.
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*/
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void* mremap(void* __old_addr, size_t __old_size, size_t __new_size, int __flags, ...);
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/**
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* [mlockall(2)](http://man7.org/linux/man-pages/man2/mlockall.2.html)
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* locks pages (preventing swapping).
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*
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* Returns 0 on success, and returns -1 and sets `errno` on failure.
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*/
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int mlockall(int __flags) __INTRODUCED_IN(17);
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/**
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* [munlockall(2)](http://man7.org/linux/man-pages/man2/munlockall.2.html)
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* unlocks pages (allowing swapping).
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*
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* Returns 0 on success, and returns -1 and sets `errno` on failure.
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*/
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int munlockall(void) __INTRODUCED_IN(17);
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/**
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* [mlock(2)](http://man7.org/linux/man-pages/man2/mlock.2.html)
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* locks pages (preventing swapping).
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*
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* Returns 0 on success, and returns -1 and sets `errno` on failure.
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*/
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int mlock(const void* __addr, size_t __size);
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/**
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* [mlock2(2)](http://man7.org/linux/man-pages/man2/mlock.2.html)
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* locks pages (preventing swapping), with optional flags.
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*
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* Returns 0 on success, and returns -1 and sets `errno` on failure.
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*/
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int mlock2(const void* __addr, size_t __size, int __flags) __INTRODUCED_IN(30);
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/**
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* [munlock(2)](http://man7.org/linux/man-pages/man2/munlock.2.html)
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* unlocks pages (allowing swapping).
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*
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* Returns 0 on success, and returns -1 and sets `errno` on failure.
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*/
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int munlock(const void* __addr, size_t __size);
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/**
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* [mincore(2)](http://man7.org/linux/man-pages/man2/mincore.2.html)
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* tests whether pages are resident in memory.
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*
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* Returns 0 on success, and returns -1 and sets `errno` on failure.
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*/
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int mincore(void* __addr, size_t __size, unsigned char* __vector);
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/**
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* [madvise(2)](http://man7.org/linux/man-pages/man2/madvise.2.html)
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* gives the kernel advice about future usage patterns.
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*
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* Returns 0 on success, and returns -1 and sets `errno` on failure.
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*/
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int madvise(void* __addr, size_t __size, int __advice);
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#if defined(__USE_GNU)
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/**
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* [memfd_create(2)](http://man7.org/linux/man-pages/man2/memfd_create.2.html)
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* creates an anonymous file.
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*
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* Returns an fd on success, and returns -1 and sets `errno` on failure.
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*/
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int memfd_create(const char* __name, unsigned __flags) __INTRODUCED_IN(30);
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#endif
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#if __ANDROID_API__ >= 23
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/*
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* Some third-party code uses the existence of POSIX_MADV_NORMAL to detect the
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* availability of posix_madvise. This is not correct, since having up-to-date
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* UAPI headers says nothing about the C library, but for the time being we
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* don't want to harm adoption of the unified headers.
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*
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* https://github.com/android-ndk/ndk/issues/395
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*/
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/** Flag for posix_madvise(). */
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#define POSIX_MADV_NORMAL MADV_NORMAL
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/** Flag for posix_madvise(). */
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#define POSIX_MADV_RANDOM MADV_RANDOM
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/** Flag for posix_madvise(). */
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#define POSIX_MADV_SEQUENTIAL MADV_SEQUENTIAL
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/** Flag for posix_madvise(). */
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#define POSIX_MADV_WILLNEED MADV_WILLNEED
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/** Flag for posix_madvise(). */
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#define POSIX_MADV_DONTNEED MADV_DONTNEED
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#endif
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/**
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* [posix_madvise(3)](http://man7.org/linux/man-pages/man3/posix_madvise.3.html)
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* gives the kernel advice about future usage patterns.
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*
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* Returns 0 on success, and returns a positive error number on failure.
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*
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* See also madvise() which has been available much longer.
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*/
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int posix_madvise(void* __addr, size_t __size, int __advice) __INTRODUCED_IN(23);
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__END_DECLS
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#include <android/legacy_sys_mman_inlines.h>
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