main.cpp: Work around a weird edge-case bug.

main.cpp

@@ -26,5 +26,35 @@ Ev::Io<int> io_main(int argc, char **argv) {
 }
 
 int main (int argc, char **argv) {
-	return Ev::start(io_main(argc, argv));
+	/* For some reason, doing a direct Ev::start(io_main(argc, argv));
+	 * results in a crash under an edge-case condition.
+	 * This edge-case condition is if data is immediately fed to
+	 * the stdin of clboss.
+	 * You can tickle it (reverting to Ev::start(io_main(argc, argv))
+	 * and recompiling first) with this:
+	 *
+	 *     echo '{"id": 0, "method": "getmanifest", "params": {}}' | ./clboss
+	 *
+	 * Note that if you just invoke clboss and input the above text
+	 * manually, it will work perfectly fine, since most humans have
+	 * reflex times measurable in dozens or hundreds of milliseconds.
+	 *
+	 * This does not normally happen in the usual case since the
+	 * lightningd usually takes a bit of time before it actually
+	 * emits the getmanifest call, and that is sufficient for the
+	 * bug to leave the edge-case condition.
+	 * On the other hand, a Sufficiently Fast (TM) processor might
+	 * re-tickle this bug someday in the future even when run on
+	 * some lightningd.
+	 *
+	 * This may be a bug in the C++ library or GCC itself, not
+	 * CLBOSS.
+	 * Why?
+	 * Because the crash reports an error somewhere in the guts of
+	 * malloc, and if you run clboss through valgrind, it does not
+	 * crash even with the direct Ev::start(io_main(argc, argv)).
+	 * valgrind works by replacing the malloc implementation, so ---
+	 */
+	auto code = io_main(argc, argv);
+	return Ev::start(code);
 }