tools/freewheel.c

   1 /*
   2  *  freewheel - start/stop JACK "freewheeling" mode
   3  *
   4  *  Copyright (C) 2003 Paul Davis.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include <stdio.h>
  22 #include <errno.h>
  23 #include <unistd.h>
  24 #include <signal.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <jack/jack.h>
  28 #include <jack/transport.h>
  29
  30 char *package;                          /* program name */
  31 jack_client_t *client;
  32 int onoff;
  33
  34 void jack_shutdown(void *arg)
  35 {
  36         fprintf(stderr, "JACK shut down, exiting ...\n");
  37         exit(1);
  38 }
  39
  40 void signal_handler(int sig)
  41 {
  42         jack_client_close(client);
  43         fprintf(stderr, "signal received, exiting ...\n");
  44         exit(0);
  45 }
  46
  47 void parse_arguments(int argc, char *argv[])
  48 {
  49         if (argc < 2) {
  50                 fprintf(stderr, "usage: %s y|n\n", package);
  51                 exit(9);
  52         }
  53
  54         if (argv[1][0] == 'y' || argv[1][0] == 'Y' || argv[1][0] == '1') {
  55                 onoff = 1;
  56         } else {
  57                 onoff = 0;
  58         }
  59 }
  60
  61 int
  62 main (int argc, char *argv[])
  63 {
  64         parse_arguments (argc, argv);
  65
  66         /* become a JACK client */
  67         if ((client = jack_client_new ("freewheel")) == 0) {
  68                 fprintf (stderr, "JACK server not running?\n");
  69                 exit(1);
  70         }
  71
  72         signal (SIGQUIT, signal_handler);
  73         signal (SIGTERM, signal_handler);
  74         signal (SIGHUP, signal_handler);
  75         signal (SIGINT, signal_handler);
  76
  77         jack_on_shutdown (client, jack_shutdown, 0);
  78
  79         if (jack_set_freewheel (client, onoff)) {
  80                 fprintf (stderr, "failed to reset freewheel mode\n");
  81         }
  82
  83         jack_client_close(client);
  84
  85         return 0;
  86 }