Switch to pselect(2) and add signal handling to Select class

src/util/select.cc

@@ -21,3 +21,15 @@
 Select *Select::instance = NULL;
 
 fd_set Select::dummy_fd_set;
+
+sigset_t Select::dummy_sigset;
+
+void Select::handle_signal( int signum )
+{
+  fatal_assert( signum >= 0 );
+  fatal_assert( signum <= MAX_SIGNAL_NUMBER );
+
+  Select &sel = get_instance();
+  sel.got_signal[ signum ] = 1;
+  sel.got_any_signal = 1;
+}