jack_status.c

#include <stdio.h>
#include <stdlib.h>

#include <jack/jack.h>

void
query_status (jack_client_t *client)
{
    float load = jack_cpu_load (client);
    printf ("DSP: %.03f%\n", load);
}

int
main (int argc, char *argv[])
{
    jack_client_t *client;

    if ((client = jack_client_open ("status", JackNullOption, NULL)) == 0) {
        fprintf (stderr, "jack server not running?\n");
        return 1;
    }

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

    query_status (client);

    jack_client_close (client);
    exit (0);
}

Makefile

.PHONY: all

all:
	gcc -ljack jack_status.c -o jack_status