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BUG#: 2278
TITLE: SignalHandler class only handles a maximum of 31 signals
DESCRIPTION: Document the exception thrown if a signal number is outside the range that can be handled by the SignalHandler.

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// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
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// Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
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// Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; Symantec Corporation; The Open Group.
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#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