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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.
*/
#ifndef CHRE_PLATFORM_SHARED_DLFCN_H_
#define CHRE_PLATFORM_SHARED_DLFCN_H_
//! This file is intended to be used when a platform doesn't provide a dlfcn.h
//! implementation so that dynamic loading support can be provided to nanoapps.
#include <cstdlib>
//! Indicates that the dlsym call is attempting to lookup the provided symbol
//! in another library (CHRE).
#ifndef RTLD_NEXT
#define RTLD_NEXT ((void *)-1L)
#endif // RTLD_NEXT
#ifdef __cplusplus
extern "C" {
#endif
/**
* This function parses, verifies, and loads a buffer containing an ELF
* file, and returns an opaque handle for symbol lookup via dlsym.
* Note that there is no requirement to pass in a 'buffer size' argument,
* since all the necessary information is gathered from the headers
* embedded in the elf file itself. The buffer is expected to contain the
* entire elf file in memory (cannot be a FILE pointer, for example).
*
* @param elfBinary is a buffer containing the elf file
* @param mapIntoTcm Indicates whether the elfBinary should be mapped into
* tightly coupled memory.
*/
void *dlopenbuf(void *elfBinary, bool mapIntoTcm);
/**
* Returns a (function) pointer to the symbol named by the input argument.
*
* @return pointer to the symbol if it was found, nullptr if not found or
* the handle was invalid
*/
void *dlsym(void *handle, const char *symbol);
/**
* Invalidate the handle used for symbol lookup, and free up any
* allocated memory.
*
* @return 0 on success
*/
int dlclose(void *handle);
#ifdef __cplusplus
}
#endif
#endif // CHRE_PLATFORM_SHARED_DLFCN_H_
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