signalhandler.cpp

This software aims to create an applet and panel tools to manage a wireless interface card, such as

//
// SignalHandler.cpp
//
// $Id: //poco/Main/Foundation/src/SignalHandler.cpp#2 $
//
// Copyright (c) 2004-2005, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
//
// 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. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
//
// 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.
//


#include "Foundation/SignalHandler.h"


#if defined(POCO_OS_FAMILY_UNIX)


#include "Foundation/Thread.h"
#include "Foundation/NumberFormatter.h"
#include "Foundation/Exception.h"
#include <signal.h>


Foundation_BEGIN


SignalHandler::JumpBufferVec SignalHandler::_jumpBufferVec;


SignalHandler::SignalHandler()
{
	JumpBufferVec& jbv = jumpBufferVec();
	JumpBuffer buf;
	jbv.push_back(buf);
}


SignalHandler::~SignalHandler()
{
	jumpBufferVec().pop_back();
}


sigjmp_buf& SignalHandler::jumpBuffer()
{
	return jumpBufferVec().back().buf;
}


void SignalHandler::throwSignalException(int sig)
{
	switch (sig)
	{
	case SIGILL:
		throw SignalException("Illegal instruction");
	case SIGBUS:
		throw SignalException("Bus error");
	case SIGSEGV:
		throw SignalException("Segmentation violation");
	case SIGSYS:
		throw SignalException("Invalid system call");
	default:
		throw SignalException(NumberFormatter::formatHex(sig));
	}
}


void SignalHandler::install()
{
	struct sigaction sa;
	sa.sa_handler = handleSignal;
	sa.sa_flags   = 0;
	sigemptyset(&sa.sa_mask);
	sigaction(SIGILL,  &sa, 0);
	sigaction(SIGBUS,  &sa, 0);
	sigaction(SIGSEGV, &sa, 0);
	sigaction(SIGSYS,  &sa, 0);
}


void SignalHandler::handleSignal(int sig)
{
	JumpBufferVec& jb = jumpBufferVec();
	if (!jb.empty())
		siglongjmp(jb.back().buf, sig);
}


SignalHandler::JumpBufferVec& SignalHandler::jumpBufferVec()
{
	ThreadImp* pThread = ThreadImp::currentImp();
	if (pThread)
		return pThread->_jumpBufferVec;
	else
		return _jumpBufferVec;
}


Foundation_END


#endif // POCO_OS_FAMILY_UNIX