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80 lines
2.4 KiB
80 lines
2.4 KiB
/*
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* Copyright (C) 2017 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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/**
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* @addtogroup Memory
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* @{
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*/
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/**
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* @file sharedmem_jni.h
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* @brief Shared memory buffers that can be shared across process.
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*/
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#ifndef ANDROID_SHARED_MEMORY_JNI_H
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#define ANDROID_SHARED_MEMORY_JNI_H
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#include <jni.h>
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#include <android/sharedmem.h>
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#include <stddef.h>
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#include <sys/cdefs.h>
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/******************************************************************
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*
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* IMPORTANT NOTICE:
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*
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* This file is part of Android's set of stable system headers
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* exposed by the Android NDK (Native Development Kit).
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*
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* Third-party source AND binary code relies on the definitions
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* here to be FROZEN ON ALL UPCOMING PLATFORM RELEASES.
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*
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* - DO NOT MODIFY ENUMS (EXCEPT IF YOU ADD NEW 32-BIT VALUES)
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* - DO NOT MODIFY CONSTANTS OR FUNCTIONAL MACROS
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* - DO NOT CHANGE THE SIGNATURE OF FUNCTIONS IN ANY WAY
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* - DO NOT CHANGE THE LAYOUT OR SIZE OF STRUCTURES
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Returns a dup'd FD from the given Java android.os.SharedMemory object. The returned file
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* descriptor has all the same properties & capabilities as the FD returned from
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* ASharedMemory_create(), however the protection flags will be the same as those of the
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* android.os.SharedMemory object.
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*
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* Use close() to release the shared memory region.
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*
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* Available since API level 27.
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*
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* \param env The JNIEnv* pointer
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* \param sharedMemory The Java android.os.SharedMemory object
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* \return file descriptor that denotes the shared memory; -1 if the shared memory object is
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* already closed, if the JNIEnv or jobject is NULL, or if there are too many open file
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* descriptors (errno=EMFILE)
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*/
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int ASharedMemory_dupFromJava(JNIEnv* env, jobject sharedMemory) __INTRODUCED_IN(27);
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#ifdef __cplusplus
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};
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#endif
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#endif // ANDROID_SHARED_MEMORY_JNI_H
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/** @} */
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