main.c


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

static void
registration_cb(jack_port_id_t port_id, int is_registered, void *arg)
{
	jack_client_t *client = (jack_client_t *)arg;
	jack_port_t *port = jack_port_by_id(client, port_id);
	const char *port_name = jack_port_name(port);

	if (is_registered) {
		printf("%s registered\n", port_name);
	} else {
		printf("%s unregistered\n", port_name);
	}
}

int
main(void)
{
	jack_client_t *client;

	client = jack_client_open("jack_connectd", JackNullOption, NULL);
	if (client == NULL) {
		fprintf(stderr, "Failed to connect to JACK server.\n");
		return 1;
	}

	/* client is passed as arg so it can be used within cb */
	jack_set_port_registration_callback(client, registration_cb, client);

	/* start processing callbacks */
	if (jack_activate(client) != 0) {
		fprintf(stderr, "Failed to activate JACK client.\n");
		return 1;
	}

	/* do nothing else while waiting */
	for (;;);

	return 0;
}