add signal api

headers/task.h

@@ -2,6 +2,7 @@
 
 #include "list.h"
 #include "memory.h"
+#include "signal.h"
 
 #include <stdint.h>
 
@@ -23,7 +24,7 @@ struct task {
 	uint8_t uid;
 	struct task *daddy;
 	struct task *child;
-	struct list **signals;
+	struct signal_data signals;
 	struct task *next;
 	struct task *prev;
 };