poke: exit with status 3 on timeout

Change-Id: Idb021fe1fa1c3d40dbcfc87d4b1dadbea6cb28f6

manpages/ndnpoke.rst

@@ -50,6 +50,8 @@ Exit Status
 
 2: Malformed command line
 
+3: No Interests received before the timeout
+
 5: Prefix registration failed
 
 Example

tests/peek/ndnpoke.t.cpp

@@ -195,7 +195,7 @@ BOOST_AUTO_TEST_CASE(Timeout)
 
   this->advanceClocks(io, 1_s, 4);
 
-  BOOST_CHECK(poke->getResult() == NdnPoke::Result::UNKNOWN);
+  BOOST_CHECK(poke->getResult() == NdnPoke::Result::TIMEOUT);
   BOOST_CHECK_EQUAL(face.sentData.size(), 0);
 
   // Check for prefix unregistration

tools/peek/ndnpoke/ndnpoke.cpp

@@ -61,6 +61,7 @@ NdnPoke::start()
     },
     [this] (auto&&) {
       m_timeoutEvent = m_scheduler.schedule(m_options.timeout, [this] {
+        m_result = Result::TIMEOUT;
         m_registeredPrefix.cancel();
       });
     },