jack2/example-clients/cpu_load.c

/** @file cpu_load.c
 *
 */

#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <signal.h>
#ifndef WIN32
#include <unistd.h>
#endif
#include <jack/jack.h>


jack_client_t *client;

static void signal_handler ( int sig )
{
    jack_client_close ( client );
    fprintf ( stderr, "signal received, exiting ...\n" );
    exit ( 0 );
}


/**
 * JACK calls this shutdown_callback if the server ever shuts down or
 * decides to disconnect the client.
 */
void
jack_shutdown ( void *arg )
{
     exit ( 1 );
}

int
main ( int argc, char *argv[] )
{
    jack_options_t options = JackNullOption;
    jack_status_t status;

    /* open a client connection to the JACK server */

    client = jack_client_open ("jack_cpu_load", options, &status);
    if ( client == NULL )
    {
        fprintf ( stderr, "jack_client_open() failed, "
                  "status = 0x%2.0x\n", status );
        if ( status & JackServerFailed )
        {
            fprintf ( stderr, "Unable to connect to JACK server\n" );
        }
        exit ( 1 );
    }
  
    jack_on_shutdown ( client, jack_shutdown, 0 );

    /* Tell the JACK server that we are ready to roll.  Our
     * process() callback will start running now. */

    if ( jack_activate ( client ) )
    {
        fprintf ( stderr, "cannot activate client" );
        exit ( 1 );
    }

    /* install a signal handler to properly quits jack client */
#ifdef WIN32
    signal ( SIGINT, signal_handler );
    signal ( SIGABRT, signal_handler );
    signal ( SIGTERM, signal_handler );
#else
    signal ( SIGQUIT, signal_handler );
    signal ( SIGTERM, signal_handler );
    signal ( SIGHUP, signal_handler );
    signal ( SIGINT, signal_handler );
#endif

     while (1)
    {
        printf("jack DSP load %f\n", jack_cpu_load(client));
#ifdef WIN32
        Sleep ( 1000 );
#else
        sleep ( 1 );
#endif
    }

    jack_client_close ( client );
    exit ( 0 );
}