diff -ur BUILD/wpa_supplicant-0.6.3/wpa_supplicant/wpa_supplicant.c BUILD2/wpa_supplicant-0.6.3/wpa_supplicant/wpa_supplicant.c
--- BUILD/wpa_supplicant-0.6.3/wpa_supplicant/wpa_supplicant.c	2008-02-23 03:45:24.000000000 +0100
+++ BUILD2/wpa_supplicant-0.6.3/wpa_supplicant/wpa_supplicant.c	2008-08-04 11:43:25.000000000 +0200
@@ -133,6 +133,22 @@
 	return set;
 }
 
+static void wpa_supplicant_handle_sigusr1(int sig, void *eloop_ctx,
+				     void *signal_ctx)
+{
+	/* Increase verbosity (by decreasing the debug level) and wrap back
+	 * to MSG_INFO when needed.
+	 */
+	if (wpa_debug_level)
+		wpa_debug_level--;
+	else
+		wpa_debug_level = MSG_INFO;
+	
+	wpa_printf(MSG_INFO, "Signal %d received - changing debug level to %s", sig,
+	           (wpa_debug_level == MSG_INFO) ? "INFO" :
+	               ((wpa_debug_level == MSG_DEBUG) ? "DEBUG" :
+	                   ((wpa_debug_level == MSG_MSGDUMP) ? "MSGDUMP" : "UNKNOWN")));
+}
 
 static int wpa_supplicant_set_wpa_none_key(struct wpa_supplicant *wpa_s,
 					   struct wpa_ssid *ssid)
@@ -2016,6 +2032,8 @@
 	eloop_register_signal_terminate(wpa_supplicant_terminate, NULL);
 	eloop_register_signal_reconfig(wpa_supplicant_reconfig, NULL);
 
+	eloop_register_signal(SIGUSR1, wpa_supplicant_handle_sigusr1, NULL);
+
 	eloop_run();
 
 	return 0;