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}

//____________________________________________________________________________//

} // namespace detail

#if defined(BOOST_SIGACTION_BASED_SIGNAL_HANDLING)

// ************************************************************************** //
// **************       Sigaction based signal handling        ************** //
// ************************************************************************** //

namespace detail {

// ************************************************************************** //
// **************    boost::detail::system_signal_exception    ************** //
// ************************************************************************** //

class system_signal_exception {
public:
    // Constructor
    system_signal_exception()
    : m_sig_info( 0 )
    , m_context( 0 )
    {}

    // Access methods
    void        operator()( siginfo_t* i, void* c )
    {
        m_sig_info  = i;
        m_context   = c;
    }
    void        report() const;

private:
    // Data members
    siginfo_t*  m_sig_info; // system signal detailed info
    void*       m_context;  // signal context
};

//____________________________________________________________________________//

void
system_signal_exception::report() const
{
    if( !m_sig_info )
        return; // no error actually occur?

    switch( m_sig_info->si_code ) {
    case SI_USER:
        report_error( execution_exception::system_error,
                      "signal: generated by kill() (or family); uid=%d; pid=%d",
                      (int)m_sig_info->si_uid, (int)m_sig_info->si_pid );
        break;
    case SI_QUEUE:
        report_error( execution_exception::system_error,
                      "signal: sent by sigqueue()" );
        break;
    case SI_TIMER:
        report_error( execution_exception::system_error,
                      "signal: the expiration of a timer set by timer_settimer()" );
        break;
    case SI_ASYNCIO:
        report_error( execution_exception::system_error,
                      "signal: generated by the completion of an asynchronous I/O request" );
        break;
    case SI_MESGQ:
        report_error( execution_exception::system_error,
                      "signal: generated by the the arrival of a message on an empty message queue" );
        break;
    default:
        break;
    }

    switch( m_sig_info->si_signo ) {
    case SIGILL:
        switch( m_sig_info->si_code ) {
#ifndef BOOST_TEST_LIMITED_SIGNAL_DETAILS
        case ILL_ILLOPC:
            report_error( execution_exception::system_fatal_error,
                          "signal: illegal opcode; address of failing instruction: 0x%08lx",
                          m_sig_info->si_addr );
            break;
        case ILL_ILLTRP:
            report_error( execution_exception::system_fatal_error,
                          "signal: illegal trap; address of failing instruction: 0x%08lx",
                          m_sig_info->si_addr );
            break;
        case ILL_PRVREG:
            report_error( execution_exception::system_fatal_error,
                          "signal: privileged register; address of failing instruction: 0x%08lx",
                          m_sig_info->si_addr );
            break;
        case ILL_BADSTK:
            report_error( execution_exception::system_fatal_error,
                          "signal: internal stack error; address of failing instruction: 0x%08lx",
                          m_sig_info->si_addr );
            break;
#endif
        case ILL_ILLOPN:
            report_error( execution_exception::system_fatal_error,
                          "signal: illegal operand; address of failing instruction: 0x%08lx",
                          m_sig_info->si_addr );
            break;
        case ILL_ILLADR:
            report_error( execution_exception::system_fatal_error,
                          "signal: illegal addressing mode; address of failing instruction: 0x%08lx",
                          m_sig_info->si_addr );
            break;
        case ILL_PRVOPC:
            report_error( execution_exception::system_fatal_error,
                          "signal: privileged opcode; address of failing instruction: 0x%08lx",
                          m_sig_info->si_addr );
            break;
        case ILL_COPROC:
            report_error( execution_exception::system_fatal_error,
                          "signal: co-processor error; address of failing instruction: 0x%08lx",
                          m_sig_info->si_addr );
            break;
        default: 
            report_error( execution_exception::system_fatal_error,