example-clients/cpu_load.c

   1 /** @file cpu_load.c
   2  *
   3  */
   4
   5 #include <stdio.h>
   6 #include <errno.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <math.h>
  10 #include <signal.h>
  11 #ifndef WIN32
  12 #include <unistd.h>
  13 #endif
  14 #include <jack/jack.h>
  15
  16
  17 jack_client_t *client;
  18
  19 static void signal_handler ( int sig )
  20 {
  21     jack_client_close ( client );
  22     fprintf ( stderr, "signal received, exiting ...\n" );
  23     exit ( 0 );
  24 }
  25
  26
  27 /**
  28  * JACK calls this shutdown_callback if the server ever shuts down or
  29  * decides to disconnect the client.
  30  */
  31 void
  32 jack_shutdown ( void *arg )
  33 {
  34      exit ( 1 );
  35 }
  36
  37 int
  38 main ( int argc, char *argv[] )
  39 {
  40     jack_options_t options = JackNullOption;
  41     jack_status_t status;
  42
  43     /* open a client connection to the JACK server */
  44
  45     client = jack_client_open ("jack_cpu_load", options, &status);
  46     if ( client == NULL )
  47     {
  48         fprintf ( stderr, "jack_client_open() failed, "
  49                   "status = 0x%2.0x\n", status );
  50         if ( status & JackServerFailed )
  51         {
  52             fprintf ( stderr, "Unable to connect to JACK server\n" );
  53         }
  54         exit ( 1 );
  55     }
  56
  57     jack_on_shutdown ( client, jack_shutdown, 0 );
  58
  59     /* Tell the JACK server that we are ready to roll.  Our
  60      * process() callback will start running now. */
  61
  62     if ( jack_activate ( client ) )
  63     {
  64         fprintf ( stderr, "cannot activate client" );
  65         exit ( 1 );
  66     }
  67
  68     /* install a signal handler to properly quits jack client */
  69 #ifdef WIN32
  70     signal ( SIGINT, signal_handler );
  71     signal ( SIGABRT, signal_handler );
  72     signal ( SIGTERM, signal_handler );
  73 #else
  74     signal ( SIGQUIT, signal_handler );
  75     signal ( SIGTERM, signal_handler );
  76     signal ( SIGHUP, signal_handler );
  77     signal ( SIGINT, signal_handler );
  78 #endif
  79
  80      while (1)
  81     {
  82         printf("jack DSP load %f\n", jack_cpu_load(client));
  83 #ifdef WIN32
  84         Sleep ( 1000 );
  85 #else
  86         sleep ( 1 );
  87 #endif
  88     }
  89
  90     jack_client_close ( client );
  91     exit ( 0 );
  92 }