Handle signals Handled signals are generally blocked and only unblocked when doing blocking I/O, i.e. either when reading commands or printing results. A (possibly queued) signal will then interrupt I/O and can be dealt with in the main loop.

--- a/cmd.h	Thu Aug 24 13:10:56 2017 +0200
+++ b/cmd.h	Fri Sep 01 22:33:41 2017 +0200
@@ -31,6 +31,7 @@
 	CMD_STATUS,
 	CMD_ERR,
 	CMD_USAGE,
+	CMD_SIGNAL,
 	CMD_QUIT
 };