blob: edf7ae64a818578ec24897e0f6d714e5daa2de69 [file] [log] [blame]
* 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
* @file
* This file provides nanoapps with wrapper functions for standard library
* functions in the standard library functions that are not supported alongside
* CHRE, which either redirect the function to an analogous CHRE function, or
* fail silently. The targeted usage of this is expected to be only for third-
* party or generated functions, where changes to either the upstream third-
* party code or the code generators might not be straightforward. It is
* expected that the nanoapp developers are aware of the 'fail silently' clause
* in the wrappers, and handle those cases appropriately.
#include <stdio.h>
#include <stdlib.h>
#include <cinttypes>
#include <cstdlib>
#include <new>
#include <chre.h>
#include "chre/util/nanoapp/assert.h"
#if defined(stderr) && !defined(_CSTD)
// Provides a definition for stderr when the macro has been defined, but the
// file has been externed. Some platforms might define their own macros for
// stderr (vs the glibc style of matching the macro to the filename), in which
// case we have to guard against those definitions as well (eg: _CSTD check
// above).
FILE *stderr = NULL;
void *malloc(size_t size) {
// On platforms where size(size_t) might be 8 bytes, we need a cast to
// maintain adherence to CHRE's heap alloc API. The size check to reject
// requests of size > 4Gb could be used for debugging, though any requests
// that even remotely approach this limit is bound to fail anyway.
return size > UINT32_MAX ? nullptr
: chreHeapAlloc(static_cast<uint32_t>(size));
void free(void *ptr) {
void *realloc(void * /*ptr*/, size_t /*newSize*/) {
// realloc() is not supported, verify that there's no call to it!
return NULL;
void exit(int exitCode) {
// Add an explicit forever-loop to bypass compilation warnings on platforms
// that might have defined exit with a noreturn tag. The loop shouldn't ever
// execute, since abort terminates the program.
while (42)
int fprintf(FILE * /*stream*/, const char * /*fmt*/, ...) {
return 0;
size_t fwrite(const void * /*ptr*/, size_t /*size*/, size_t /*count*/,
FILE * /*stream*/) {
return 0;
void operator delete(void * /*ptr*/) {
void operator delete(void * /*ptr*/, std::size_t /*sz*/) {
void operator delete(void * /*ptr*/, std::align_val_t /*al*/) {
void operator delete(void * /*ptr*/, std::size_t /*sz*/,
std::align_val_t /*al*/) {