//%LICENSE////////////////////////////////////////////////////////////////
//
// Licensed to The Open Group (TOG) under one or more contributor license
// agreements.  Refer to the OpenPegasusNOTICE.txt file distributed with
// this work for additional information regarding copyright ownership.
// Each contributor licenses this file to you under the OpenPegasus Open
// Source License; you may not use this file except in compliance with the
// License.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//////////////////////////////////////////////////////////////////////////
//
//%/////////////////////////////////////////////////////////////////////////////

#include <cstdio>
#include <cstring>

#include <Pegasus/Common/Config.h>
#include <Pegasus/Common/Signal.h>
#include <Pegasus/Common/Exception.h>

PEGASUS_NAMESPACE_BEGIN

#ifdef PEGASUS_HAS_SIGNALS

SignalHandler::SignalHandler()
{
    for (unsigned i = 0; i <= PEGASUS_NSIG; i++)
    {
       register_handler &rh = reg_handler[i];
       rh.signum = i;
       rh.active = 0;
       rh.sh = NULL;
       memset(&rh.oldsa,0,sizeof(struct sigaction));
    }
}

SignalHandler::~SignalHandler()
{
    deactivateAll();
}

void SignalHandler::verifySignum(unsigned signum)
{
    if ( signum > PEGASUS_NSIG )
    {
        throw IndexOutOfBoundsException();
    }
}

SignalHandler::register_handler&
SignalHandler::getHandler(unsigned signum)
{
    verifySignum(signum);
    return reg_handler[signum];
}

void SignalHandler::registerHandler(unsigned signum, signal_handler sighandler)
{
    register_handler &rh = getHandler(signum);
    AutoMutex autoMut(reg_mutex);
    deactivate_i(rh);
    rh.sh = sighandler;
}

void SignalHandler::activate(unsigned signum)
{
    register_handler &rh = getHandler(signum);
    AutoMutex autoMut(reg_mutex);
    if (rh.active)
    {
        return; // throw exception
    }

    struct sigaction sig_acts;

    sig_acts.sa_sigaction = rh.sh;
    sigfillset(&(sig_acts.sa_mask));
    sig_acts.sa_flags = SA_SIGINFO;

    sigaction(signum, &sig_acts, &rh.oldsa);

    rh.active = -1;
}

void SignalHandler::deactivate(unsigned signum)
{
    register_handler &rh = getHandler(signum);
    AutoMutex autoMut(reg_mutex);
    deactivate_i(rh);
}

void SignalHandler::deactivate_i(register_handler &rh)
{
    if (rh.active)
    {
        rh.active = 0;
        sigaction(rh.signum, &rh.oldsa, NULL);
    }
}

void SignalHandler::deactivateAll()
{
    AutoMutex autoMut(reg_mutex);
    for (unsigned i=0; i <= PEGASUS_NSIG; i++)
    {
        register_handler &rh = reg_handler[i];
        if (rh.active)
        {
            deactivate_i(rh);
        }
    }
}

void SignalHandler::ignore(unsigned signum)
{
    verifySignum(signum);

#if !defined(PEGASUS_OS_DARWIN)
    sigignore(signum);
#else
    struct sigaction sig_acts;

    sig_acts.sa_handler = SIG_IGN;
    sigfillset(&(sig_acts.sa_mask));
    sig_acts.sa_flags = 0;

    sigaction(signum, &sig_acts, NULL);
#endif
}

void SignalHandler::defaultAction(unsigned signum)
{
    verifySignum(signum);

    struct sigaction sig_acts;

    sig_acts.sa_handler = SIG_DFL;
    sigfillset(&(sig_acts.sa_mask));
    sig_acts.sa_flags = 0;

    sigaction(signum, &sig_acts, NULL);
}


#else // PEGASUS_HAS_SIGNALS

SignalHandler::SignalHandler() { }

SignalHandler::~SignalHandler() { }

void SignalHandler::registerHandler(unsigned signum, signal_handler _sighandler)
{ }

void SignalHandler::activate(unsigned signum) { }

void SignalHandler::deactivate(unsigned signum) { }

void SignalHandler::deactivateAll() { }

void SignalHandler::ignore(unsigned signum) { }

void SignalHandler::defaultAction(unsigned signum) { }

#endif // PEGASUS_HAS_SIGNALS


// export the global signal handling object

SignalHandler _globalSignalHandler;
SignalHandler * _globalSignalHandlerPtr = &_globalSignalHandler;
SignalHandler * getSigHandle() { return _globalSignalHandlerPtr; }


PEGASUS_NAMESPACE_END