af32bb9c4f
This update splits old MTP code and new MTP code from Google into two trees, legacy and ffs. Depending on the SDK level, the build system will select the correct version. The reason for separating the versions out are due to older android trees not supporting the updated MTP code from Google. Most MTP code is from Google, with additions needed from implementing the Java functions in C++ for TWRP and FFS. We assume if you are in android-9.0 or above, your kernel has support for FFS over MTP. Verify that your init.rc is mounting the MTP FFS driver to the proper location. Change-Id: I4b107b239bd9bc5699527f9c8c77d9079f264a7e
84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _ASYNCIO_H
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#define _ASYNCIO_H
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#include <fcntl.h>
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#include <linux/aio_abi.h>
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#include <memory>
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#include <signal.h>
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <time.h>
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#include <thread>
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#include <unistd.h>
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/**
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* Provides a subset of POSIX aio operations, as well
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* as similar operations with splice and threadpools.
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*/
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struct aiocb {
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int aio_fildes; // Assumed to be the source for splices
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void *aio_buf; // Unused for splices
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// Used for threadpool operations only, freed automatically
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std::unique_ptr<char[]> aio_pool_buf;
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off_t aio_offset;
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size_t aio_nbytes;
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int aio_sink; // Unused for non splice r/w
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// Used internally
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std::thread thread;
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ssize_t ret;
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int error;
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~aiocb();
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};
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// Submit a request for IO to be completed
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int aio_read(struct aiocb *);
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int aio_write(struct aiocb *);
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int aio_splice_read(struct aiocb *);
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int aio_splice_write(struct aiocb *);
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// Suspend current thread until given IO is complete, at which point
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// its return value and any errors can be accessed
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// All submitted requests must have a corresponding suspend.
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// aiocb->aio_buf must refer to valid memory until after the suspend call
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int aio_suspend(struct aiocb *[], int, const struct timespec *);
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int aio_error(const struct aiocb *);
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ssize_t aio_return(struct aiocb *);
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// (Currently unimplemented)
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int aio_cancel(int, struct aiocb *);
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// Initialize a threadpool to perform IO. Only one pool can be
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// running at a time.
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void aio_pool_write_init();
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void aio_pool_splice_init();
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// Suspend current thread until all queued work is complete, then ends the threadpool
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void aio_pool_end();
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// Submit IO work for the threadpool to complete. Memory associated with the work is
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// freed automatically when the work is complete.
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int aio_pool_write(struct aiocb *);
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#endif // ASYNCIO_H
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