Index: src/pipe.cpp
===================================================================
--- src/pipe.cpp.orig	2011-11-30 00:16:31.000000000 +0200
+++ src/pipe.cpp	2017-03-27 10:34:55.261175583 +0200
@@ -83,5 +83,5 @@ ssize_t Pipe::read(void *buffer, unsigne
 void Pipe::signal()
 {
   // TODO: ignoring return of read/write generates warning; maybe relevant for eventloop work...
-  ::write(_fd_write, '\0', 1);
+  ::write(_fd_write, 0, 1);
 }