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//***************************************************************************
// libxx/libxx_eabi_atexit.cxx
//
// Copyright (C) 2012 Gregory Nutt. All rights reserved.
// Author: Gregory Nutt <gnutt@nuttx.org>
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
// 3. Neither the name NuttX nor the names of its contributors may be
// used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
//***************************************************************************
//***************************************************************************
// Included Files
//***************************************************************************
#include <nuttx/config.h>
#include <cassert>
#include "libxx_internal.hxx"
//***************************************************************************
// Pre-processor Definitions
//***************************************************************************
//***************************************************************************
// Private Types
//***************************************************************************
struct __cxa_atexit_s
{
__cxa_exitfunc_t func;
FAR void *arg;
};
//***************************************************************************
// Private Data
//***************************************************************************
extern "C"
{
//*************************************************************************
// Public Data
//*************************************************************************
FAR void *__dso_handle = NULL;
//*************************************************************************
// Private Functions
//*************************************************************************
//*************************************************************************
// Name: __cxa_callback
//
// Description:
// This is really just an "adaptor" function that matches the form of
// the __cxa_exitfunc_t to an onexitfunc_t using an allocated structure
// to marshall the call parameters.
//
//*************************************************************************
#if CONFIG_SCHED_ONEXIT
static void __cxa_callback(int exitcode, FAR void *arg)
{
FAR struct __cxa_atexit_s *alloc = (FAR struct __cxa_atexit_s *)arg;
DEBUGASSERT(alloc && alloc->func);
alloc->func(alloc->arg);
lib_free(alloc);
}
#endif
//*************************************************************************
// Public Functions
//*************************************************************************
//*************************************************************************
// Name: __cxa_atexit
//
// Description:
// __cxa_atexit() registers a destructor function to be called by exit().
// On a call to exit(), the registered functions should be called with
// the single argument 'arg'. Destructor functions shall always be
// called in the reverse order to their registration (i.e. the most
// recently registered function shall be called first),
//
// If shared libraries were supported, the callbacks should be invoked
// when the shared library is unloaded as well.
//
// Reference:
// Linux base
//
//*************************************************************************
int __cxa_atexit(__cxa_exitfunc_t func, FAR void *arg, FAR void *dso_handle)
{
#if CONFIG_SCHED_ONEXIT
// Allocate memory to hold the marshaled __cxa_exitfunc_t call
// information.
FAR struct __cxa_atexit_s *alloc =
(FAR struct __cxa_atexit_s *)lib_malloc(sizeof(struct __cxa_atexit_s));
if (alloc)
{
// Register the function to be called when the task/thread exists.
alloc->func = func;
alloc->arg = arg;
return on_exit(__cxa_callback, alloc);
}
else
#endif
{
// What else can we do?
return 0;
}
}
}
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