transmitter.cc

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/*
    Copyright (C) 1998-99 Paul Barton-Davis 

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id$
*/

#include <cstdlib>
#include <signal.h>
#include <string>

#include "pbd/transmitter.h"
#include "pbd/error.h"

using std::string;
using std::ios;

Transmitter::Transmitter (Channel c)
{
        channel = c;
        switch (c) {
        case Error:
                send = &error;
                break;
        case Warning:
                send = &warning;
                break;
        case Info:
                send = &info;
                break;
        case Fatal:
                send = &fatal;
                break;
        case Throw:
                /* we should never call Transmitter::deliver
                   for thrown messages (because its overridden in the
                   class heirarchy). force a segv if we do.
                */
                send = 0;
                break;
        }
}               

void
Transmitter::deliver ()

{
        string foo;

        /* NOTE: this is just a default action for a Transmitter or a
           derived class. Any class can override this to produce some
           other action when deliver() is called. 
        */

        *this << '\0';

        /* send the SigC++ signal */

        foo = str();
        (*send) (channel, foo.c_str());

        /* XXX when or how can we delete this ? */
        // delete foo;

        /* return to a pristine state */

        clear ();
        seekp (0, ios::beg);
        seekg (0, ios::beg);

        /* do the right thing if this should not return */
        
        if (does_not_return()) {
#ifndef PLATFORM_WINDOWS
// TODO !!!! Commented out temporarily (for Windows)
                sigset_t mask;
                
                sigemptyset (&mask);
                sigsuspend (&mask);
                /*NOTREACHED*/
                exit (1);
/* JE - From what I can tell, the above code suspends
 * program execution until (any) signal occurs. Not
 * sure at the moment what this achieves, unless it
 * provides some time for the user to see the message.
 */
#endif
        } 
}

bool
Transmitter::does_not_return ()

{
        if (channel == Fatal || channel == Throw) {
                return true;
        } else {
                return false;
        }
}


extern "C" {
  void pbd_c_error (const char *str)
 
  {
        PBD::error << str << endmsg;
  }
}