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81 lines
2.8 KiB
81 lines
2.8 KiB
4 months ago
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/*
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* Copyright (C) 2020 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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* @file stdlib_wrapper.cc
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*
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* This file provides nanoapps with wrapper functions for standard library
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* functions in the standard library functions that are not supported alongside
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* CHRE, which either redirect the function to an analogous CHRE function, or
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* fail silently. The targeted usage of this is expected to be only for third-
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* party or generated functions, where changes to either the upstream third-
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* party code or the code generators might not be straightforward. It is
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* expected that the nanoapp developers are aware of the 'fail silently' clause
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* in the wrappers, and handle those cases appropriately.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <chre.h>
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#include "chre/util/nanoapp/assert.h"
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#if defined(stderr) && !defined(_CSTD)
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// Provides a definition for stderr when the macro has been defined, but the
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// file has been externed. Some platforms might define their own macros for
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// stderr (vs the glibc style of matching the macro to the filename), in which
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// case we have to guard against those definitions as well (eg: _CSTD check
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// above).
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FILE *stderr = NULL;
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#endif
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void *malloc(size_t size) {
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// On platforms where size(size_t) might be 8 bytes, we need a cast to
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// maintain adherence to CHRE's heap alloc API. The size check to reject
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// requests of size > 4Gb could be used for debugging, though any requests
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// that even remotely approach this limit is bound to fail anyway.
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return size > UINT32_MAX ? nullptr
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: chreHeapAlloc(static_cast<uint32_t>(size));
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}
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void free(void *ptr) {
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chreHeapFree(ptr);
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}
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void *realloc(void * /*ptr*/, size_t /*newSize*/) {
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// realloc() is not supported, verify that there's no call to it!
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CHRE_ASSERT(false);
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return NULL;
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}
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void exit(int exitCode) {
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chreAbort(static_cast<uint32_t>(exitCode));
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// Add an explicit forever-loop to bypass compilation warnings on platforms
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// that might have defined exit with a noreturn tag. The loop shouldn't ever
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// execute, since abort terminates the program.
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while (42)
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;
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}
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int fprintf(FILE * /*stream*/, const char * /*fmt*/, ...) {
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return 0;
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}
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size_t fwrite(const void * /*ptr*/, size_t /*size*/, size_t /*count*/,
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FILE * /*stream*/) {
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return 0;
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}
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