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transmitter.cc

/*
    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: transmitter.cc,v 1.5 2004/02/22 23:04:02 taybin Exp $
*/

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

#include <pbd/transmitter.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()) {
            sigset_t mask;
            
            sigemptyset (&mask);
            sigsuspend (&mask);
            /*NOTREACHED*/
            exit (1);
      } 
}

bool
Transmitter::does_not_return ()

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

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

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