Index: sys_pipe.c
===================================================================
--- sys_pipe.c	(revision 238946)
+++ sys_pipe.c	(working copy)
@@ -1306,6 +1306,14 @@
 
 	pipeunlock(wpipe);
 	PIPE_UNLOCK(rpipe);
+
+	if (rpipe->pipe_state & PIPE_NAMED && error == EPIPE &&
+	    uio->uio_resid != orig_resid) {
+		error = 0;
+		PROC_LOCK(td->td_proc);
+		tdsignal(td, SIGPIPE);
+		PROC_UNLOCK(td->td_proc);
+	}
 	return (error);
 }