diff --git a/include/_tail_mon/signal.h b/include/_tail_mon/signal.h
new file mode 100644
index 000000000..86b47d557
--- /dev/null
+++ b/include/_tail_mon/signal.h
@@ -0,0 +1,21 @@
+#define NSIG 17
+
+#define	SIGHUP	1	/* hangup */
+#define	SIGINT	2	/* interrupt */
+#define	SIGQUIT	3	/* quit */
+#define	SIGILL	4	/* illegal instruction (not reset when caught) */
+#define	SIGTRAP	5	/* trace trap (not reset when caught) */
+#define	SIGIOT	6	/* IOT instruction */
+#define	SIGEMT	7	/* EMT instruction */
+#define	SIGFPE	8	/* floating point exception */
+#define	SIGKILL	9	/* kill (cannot be caught or ignored) */
+#define	SIGBUS	10	/* bus error */
+#define	SIGSEGV	11	/* segmentation violation */
+#define	SIGSYS	12	/* bad argument to system call */
+#define	SIGPIPE	13	/* write on a pipe with no one to read it */
+#define	SIGALRM	14	/* alarm clock */
+#define	SIGTERM	15	/* software termination signal from kill */
+
+int	(*signal())();
+#define	SIG_DFL	(int (*)())0
+#define	SIG_IGN	(int (*)())1