libs/pbd/transmitter.cc

   1 /*
   2     Copyright (C) 1998-99 Paul Barton-Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18     $Id$
  19 */
  20
  21 #include <cstdlib>
  22 #include <signal.h>
  23 #include <iostream>
  24 #include <string>
  25
  26 #include "pbd/transmitter.h"
  27 #include "pbd/error.h"
  28
  29 using std::string;
  30 using std::ios;
  31
  32 Transmitter::Transmitter (Channel c)
  33 {
  34         channel = c;
  35         switch (c) {
  36         case Error:
  37                 send = &error;
  38                 break;
  39         case Warning:
  40                 send = &warning;
  41                 break;
  42         case Info:
  43                 send = &info;
  44                 break;
  45         case Fatal:
  46                 send = &fatal;
  47                 break;
  48         case Throw:
  49                 /* we should never call Transmitter::deliver
  50                    for thrown messages (because its overridden in the
  51                    class heirarchy). force a segv if we do.
  52                 */
  53                 send = 0;
  54                 break;
  55         }
  56 }
  57
  58 void
  59 Transmitter::deliver ()
  60
  61 {
  62         string foo;
  63
  64         /* NOTE: this is just a default action for a Transmitter or a
  65            derived class. Any class can override this to produce some
  66            other action when deliver() is called.
  67         */
  68
  69         *this << '\0';
  70
  71         /* send the SigC++ signal */
  72
  73         foo = str();
  74         (*send) (channel, foo.c_str());
  75
  76         /* XXX when or how can we delete this ? */
  77         // delete foo;
  78
  79         /* return to a pristine state */
  80
  81         clear ();
  82         seekp (0, ios::beg);
  83         seekg (0, ios::beg);
  84
  85         /* do the right thing if this should not return */
  86
  87         if (does_not_return()) {
  88                 sigset_t mask;
  89
  90                 sigemptyset (&mask);
  91                 sigsuspend (&mask);
  92                 /*NOTREACHED*/
  93                 exit (1);
  94         }
  95 }
  96
  97 bool
  98 Transmitter::does_not_return ()
  99
 100 {
 101         if (channel == Fatal || channel == Throw) {
 102                 return true;
 103         } else {
 104                 return false;
 105         }
 106 }
 107
 108
 109 extern "C" {
 110   void pbd_c_error (const char *str)
 111
 112   {
 113         PBD::error << str << endmsg;
 114   }
 115 }