Index: wpa_supplicant/wpa_supplicant.c
===================================================================
--- wpa_supplicant/wpa_supplicant.c.orig
+++ wpa_supplicant/wpa_supplicant.c
@@ -139,6 +139,22 @@ int wpa_set_wep_keys(struct wpa_supplica
 	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)
@@ -2342,6 +2358,8 @@ int wpa_supplicant_run(struct wpa_global
 	eloop_register_signal_terminate(wpa_supplicant_terminate, global);
 	eloop_register_signal_reconfig(wpa_supplicant_reconfig, global);
 
+	eloop_register_signal(SIGUSR1, wpa_supplicant_handle_sigusr1, NULL);
+
 	eloop_run();
 
 	return 0;