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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @addtogroup FileDescriptor File Descriptor
* @{
*/
/**
* @file file_descriptor_jni.h
*/
#pragma once
#include <sys/cdefs.h>
#include <jni.h>
#if !defined(__BIONIC__) && !defined(__INTRODUCED_IN)
#define __INTRODUCED_IN(x)
#endif
__BEGIN_DECLS
/**
* Returns a new java.io.FileDescriptor.
*
* The FileDescriptor created represents an invalid Unix file descriptor (represented by
* a file descriptor value of -1).
*
* Callers of this method should be aware that it can fail, returning NULL with a pending Java
* exception.
*
* Available since API level 31.
*
* \param env a pointer to the JNI Native Interface of the current thread.
* \return a java.io.FileDescriptor on success, nullptr if insufficient heap memory is available.
*/
jobject AFileDescriptor_create(JNIEnv* env) __INTRODUCED_IN(31);
/**
* Returns the Unix file descriptor represented by the given java.io.FileDescriptor.
*
* A return value of -1 indicates that \a fileDescriptor represents an invalid file descriptor.
*
* Aborts the program if \a fileDescriptor is not a java.io.FileDescriptor instance.
*
* Available since API level 31.
*
* \param env a pointer to the JNI Native Interface of the current thread.
* \param fileDescriptor a java.io.FileDescriptor instance.
* \return the Unix file descriptor wrapped by \a fileDescriptor.
*/
int AFileDescriptor_getFd(JNIEnv* env, jobject fileDescriptor) __INTRODUCED_IN(31);
/**
* Sets the Unix file descriptor represented by the given java.io.FileDescriptor.
*
* This function performs no validation of the Unix file descriptor argument, \a fd. Android uses
* the value -1 to represent an invalid file descriptor, all other values are considered valid.
* The validity of a file descriptor can be checked with FileDescriptor#valid().
*
* Aborts the program if \a fileDescriptor is not a java.io.FileDescriptor instance.
*
* Available since API level 31.
*
* \param env a pointer to the JNI Native Interface of the current thread.
* \param fileDescriptor a java.io.FileDescriptor instance.
* \param fd a Unix file descriptor that \a fileDescriptor will subsequently represent.
*/
void AFileDescriptor_setFd(JNIEnv* env, jobject fileDescriptor, int fd) __INTRODUCED_IN(31);
__END_DECLS
/** @} */
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