example-clients/evmon.c

   1 /*
   2     Copyright (C) 2007 Paul 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
  19 #include <stdio.h>
  20 #include <errno.h>
  21 #ifndef WIN32
  22 #include <unistd.h>
  23 #endif
  24 #include <string.h>
  25 #include <signal.h>
  26 #include <stdlib.h>
  27
  28 #include <jack/jack.h>
  29
  30 jack_client_t *client;
  31
  32 static void signal_handler(int sig)
  33 {
  34         jack_client_close(client);
  35         fprintf(stderr, "signal received, exiting ...\n");
  36         exit(0);
  37 }
  38
  39 static void
  40 port_callback (jack_port_id_t port, int yn, void* arg)
  41 {
  42         printf ("Port %d %s\n", port, (yn ? "registered" : "unregistered"));
  43 }
  44
  45 static void
  46 connect_callback (jack_port_id_t a, jack_port_id_t b, int yn, void* arg)
  47 {
  48         printf ("Ports %d and %d %s\n", a, b, (yn ? "connected" : "disconnected"));
  49 }
  50
  51 static void
  52 client_callback (const char* client, int yn, void* arg)
  53 {
  54         printf ("Client %s %s\n", client, (yn ? "registered" : "unregistered"));
  55 }
  56
  57 static int
  58 graph_callback (void* arg)
  59 {
  60         printf ("Graph reordered\n");
  61         return 0;
  62 }
  63
  64 int
  65 main (int argc, char *argv[])
  66 {
  67         jack_options_t options = JackNullOption;
  68         jack_status_t status;
  69
  70         if ((client = jack_client_open ("event-monitor", options, &status, NULL)) == 0) {
  71                 fprintf (stderr, "jack_client_open() failed, "
  72                          "status = 0x%2.0x\n", status);
  73                 if (status & JackServerFailed) {
  74                         fprintf (stderr, "Unable to connect to JACK server\n");
  75                 }
  76                 return 1;
  77         }
  78
  79         if (jack_set_port_registration_callback (client, port_callback, NULL)) {
  80                 fprintf (stderr, "cannot set port registration callback\n");
  81                 return 1;
  82         }
  83         if (jack_set_port_connect_callback (client, connect_callback, NULL)) {
  84                 fprintf (stderr, "cannot set port connect callback\n");
  85                 return 1;
  86         }
  87         if (jack_set_client_registration_callback (client, client_callback, NULL)) {
  88                 fprintf (stderr, "cannot set client registration callback\n");
  89                 return 1;
  90         }
  91         if (jack_set_graph_order_callback (client, graph_callback, NULL)) {
  92                 fprintf (stderr, "cannot set graph order registration callback\n");
  93                 return 1;
  94         }
  95         if (jack_activate (client)) {
  96                 fprintf (stderr, "cannot activate client");
  97                 return 1;
  98         }
  99
 100 #ifdef WIN32
 101         signal(SIGINT, signal_handler);
 102     signal(SIGABRT, signal_handler);
 103         signal(SIGTERM, signal_handler);
 104 #else
 105         signal(SIGQUIT, signal_handler);
 106         signal(SIGTERM, signal_handler);
 107         signal(SIGHUP, signal_handler);
 108         signal(SIGINT, signal_handler);
 109 #endif
 110
 111         sleep (-1);
 112         exit (0);
 113 }
 114