130 lines
4.4 KiB
C++
130 lines
4.4 KiB
C++
//***************************************************************************
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// libs/libxx/libxx_eabi_atexit.cxx
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//
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// Licensed to the Apache Software Foundation (ASF) under one or more
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// contributor license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright ownership. The
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// ASF licenses this file to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance with the
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// License. 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, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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//
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//***************************************************************************
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//***************************************************************************
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// Included Files
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//***************************************************************************
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#include <nuttx/config.h>
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#include <cassert>
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#include "libxx.hxx"
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//***************************************************************************
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// Pre-processor Definitions
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//***************************************************************************
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//***************************************************************************
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// Private Types
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//***************************************************************************
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struct __cxa_atexit_s
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{
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__cxa_exitfunc_t func;
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FAR void *arg;
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};
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//***************************************************************************
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// Private Data
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//***************************************************************************
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extern "C"
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{
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//*************************************************************************
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// Public Data
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//*************************************************************************
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FAR void *__dso_handle = &__dso_handle;
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//*************************************************************************
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// Private Functions
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//*************************************************************************
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//*************************************************************************
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// Name: __cxa_callback
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//
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// Description:
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// This is really just an "adaptor" function that matches the form of
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// the __cxa_exitfunc_t to an onexitfunc_t using an allocated structure
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// to marshall the call parameters.
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//
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//*************************************************************************
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#ifdef CONFIG_SCHED_ONEXIT
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static void __cxa_callback(int exitcode, FAR void *arg)
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{
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FAR struct __cxa_atexit_s *alloc = (FAR struct __cxa_atexit_s *)arg;
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DEBUGASSERT(alloc && alloc->func);
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alloc->func(alloc->arg);
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lib_free(alloc);
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}
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#endif
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//*************************************************************************
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// Public Functions
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//*************************************************************************
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//*************************************************************************
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// Name: __cxa_atexit
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//
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// Description:
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// __cxa_atexit() registers a destructor function to be called by exit().
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// On a call to exit(), the registered functions should be called with
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// the single argument 'arg'. Destructor functions shall always be
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// called in the reverse order to their registration (i.e. the most
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// recently registered function shall be called first),
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//
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// If shared libraries were supported, the callbacks should be invoked
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// when the shared library is unloaded as well.
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//
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// Reference:
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// Linux base
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//
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//*************************************************************************
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int __cxa_atexit(__cxa_exitfunc_t func, FAR void *arg, FAR void *dso_handle)
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{
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#ifdef CONFIG_SCHED_ONEXIT
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// Allocate memory to hold the marshaled __cxa_exitfunc_t call
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// information.
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FAR struct __cxa_atexit_s *alloc =
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(FAR struct __cxa_atexit_s *)lib_malloc(sizeof(struct __cxa_atexit_s));
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if (alloc)
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{
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// Register the function to be called when the task/thread exists.
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alloc->func = func;
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alloc->arg = arg;
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return on_exit(__cxa_callback, alloc);
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}
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else
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#endif
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{
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// What else can we do?
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return 0;
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}
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}
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}
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