Merge remote-tracking branch 'origin/topic/jsiwek/improve_comm_loop'

* origin/topic/jsiwek/improve_comm_loop:
  Add a simple FD_Set wrapper/helper class.
  Fix Pipe copy/assignment to make a copy of flags.
  Fix possible abort on writing to a full pipe.
  Remove timeouts from remote communication loop.

src/Flare.h

@@ -0,0 +1,44 @@
+// See the file "COPYING" in the main distribution directory for copyright.
+
+#ifndef BRO_FLARE_H
+#define BRO_FLARE_H
+
+#include "Pipe.h"
+
+namespace bro {
+
+class Flare {
+public:
+
+	/**
+	 * Create a flare object that can be used to signal a "ready" status via
+	 * a file descriptor that may be integrated with select(), poll(), etc.
+	 * Not thread-safe, but that should only require Fire()/Extinguish() calls
+	 * to be made mutually exclusive (across all copies of a Flare).
+	 */
+	Flare();
+
+	/**
+	 * @return a file descriptor that will become ready if the flare has been
+	 *         Fire()'d and not yet Extinguished()'d.
+	 */
+	int FD() const
+		{ return pipe.ReadFD(); }
+
+	/**
+	 * Put the object in the "ready" state.
+	 */
+	void Fire();
+
+	/**
+	 * Take the object out of the "ready" state.
+	 */
+	void Extinguish();
+
+private:
+	Pipe pipe;
+};
+
+} // namespace bro
+
+#endif // BRO_FLARE_H