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