+char *progname = NULL;
+
+void usage(void)
+{
+ fprintf(stderr, "usage: %s [OPTIONS] COMMAND PID...\n", progname);
+ fprintf(stderr, "\nControl the tracing of a process that supports LTTng Userspace Tracing.\n\
+\n\
+Commands:\n\
+ --start-trace\t\t\tStart tracing\n\
+ --stop-trace\t\t\tStop tracing\n\
+ --destroy-trace\t\t\tDestroy the trace\n\
+ --enable-marker CHANNEL/MARKER\tEnable a marker\n\
+ --disable-marker CHANNEL/MARKER\tDisable a marker\n\
+ --list-markers\tList the markers of the process and their state\n\
+\n\
+");
+}
+