diff --git a/include/common/defaults.h b/include/common/defaults.h
index 07cb75f..cdc6b7f 100644
--- a/include/common/defaults.h
+++ b/include/common/defaults.h
@@ -166,4 +166,11 @@
 #define STATS_VERSION_STRING " version " HAPROXY_VERSION ", released " HAPROXY_DATE
 #endif
 
+/* Maximum signal queue size, and also number of different signals we can
+ * handle.
+ */
+#ifndef MAX_SIGNAL
+#define MAX_SIGNAL 256
+#endif
+
 #endif /* _COMMON_DEFAULTS_H */
diff --git a/include/proto/signal.h b/include/proto/signal.h
new file mode 100644
index 0000000..2734827
--- /dev/null
+++ b/include/proto/signal.h
@@ -0,0 +1,29 @@
+/*
+ * Asynchronous signal delivery functions.
+ *
+ * Copyright 2000-2009 Willy Tarreau <w@1wt.eu>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <signal.h>
+#include <common/standard.h>
+#include <types/signal.h>
+
+extern int signal_queue_len;
+extern struct signal_descriptor signal_state[];
+
+void signal_init();
+void signal_handler(int sig);
+void signal_register(int sig, void (*handler)(int));
+void __signal_process_queue();
+
+static inline void signal_process_queue()
+{
+	if (unlikely(signal_queue_len > 0))
+		__signal_process_queue();
+}
diff --git a/include/types/signal.h b/include/types/signal.h
new file mode 100644
index 0000000..b863d23
--- /dev/null
+++ b/include/types/signal.h
@@ -0,0 +1,20 @@
+/*
+ * Asynchronous signal delivery functions descriptors.
+ *
+ * Copyright 2000-2009 Willy Tarreau <w@1wt.eu>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <signal.h>
+#include <common/config.h>
+#include <common/standard.h>
+
+struct signal_descriptor {
+	int count;  /* number of times raised */
+	void (*handler)(int sig);
+};