Add control example client

git-svn-id: http://subversion.jackaudio.org/jack/jack2/trunk/jackmp@2014 0c269be4-1314-0410-8aa9-9f06e86f4224

example-clients/control.c

@@ -0,0 +1,71 @@
+/** @file simple_client.c
+ *
+ * @brief This simple client demonstrates the basic features of JACK
+ * as they would be used by many applications.
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <jack/jack.h>
+
+jack_client_t *client;
+static int reorder = 0;
+   
+static int Jack_Graph_Order_Callback(void *arg)
+{
+    const char **ports;
+    int i;
+	
+    printf("Jack_Graph_Order_Callback count = %ld\n", reorder++);
+    
+    ports = jack_get_ports(client, NULL, NULL, JackPortIsPhysical|JackPortIsOutput);
+	for (i = 0;  ports[i]; ++i) {
+        printf("name: %s\n", ports[i]);
+    }
+	free(ports);
+    
+    ports = jack_get_ports(client, NULL, NULL, JackPortIsPhysical|JackPortIsInput);
+	for (i = 0;  ports[i]; ++i) {
+        printf("name: %s\n", ports[i]);
+    }
+	free(ports);
+    
+    return 0;
+}
+
+int
+main (int argc, char *argv[])
+{
+	jack_options_t options = JackNullOption;
+	jack_status_t status;
+    char c;
+	
+	/* open a client connection to the JACK server */
+
+	client = jack_client_open("control_client", options, &status);
+	if (client == NULL) {
+		printf("jack_client_open() failed \n");
+		exit(1);
+	}
+	
+	if (jack_set_graph_order_callback(client, Jack_Graph_Order_Callback, 0) != 0) {
+        printf("Error when calling jack_set_graph_order_callback() !\n");
+    }
+
+	/* Tell the JACK server that we are ready to roll.  Our
+	 * process() callback will start running now. */
+
+	if (jack_activate(client)) {
+		printf("cannot activate client");
+		exit(1);
+	}
+	
+    printf("Type 'q' to quit\n");	
+    while ((getchar() != 'q')) {}
+  
+	jack_client_close(client);
+	exit (0);
+}