don't use 100% cpu

llarp/ev.hpp

@@ -152,7 +152,7 @@ struct llarp_ev_loop
   create_tun(llarp_tun_io* tun) = 0;
 
   virtual bool
-  add_ev(llarp::ev_io* ev) = 0;
+  add_ev(llarp::ev_io* ev, bool write = false) = 0;
 
   virtual bool
   running() const = 0;

llarp/ev_epoll.hpp

@@ -296,11 +296,13 @@ struct llarp_epoll_loop : public llarp_ev_loop
   }
 
   bool
-  add_ev(llarp::ev_io* e)
+  add_ev(llarp::ev_io* e, bool write)
   {
     epoll_event ev;
     ev.data.ptr = e;
-    ev.events   = EPOLLIN | EPOLLOUT;
+    ev.events   = EPOLLIN;
+    if(write)
+      ev.events |= EPOLLOUT;
     if(epoll_ctl(epollfd, EPOLL_CTL_ADD, e->fd, &ev) == -1)
     {
       delete e;

llarp/ev_kqueue.hpp

@@ -251,9 +251,12 @@ struct llarp_kqueue_loop : public llarp_ev_loop
   }
 
   bool
-  add_ev(llarp::ev_io* ev)
+  add_ev(llarp::ev_io* ev, bool write)
   {
-    EV_SET(&change, ev->fd, EVFILT_READ | EVFILT_WRITE, EV_ADD, 0, 0, ev);
+    if(write)
+      EV_SET(&change, ev->fd, EVFILT_READ | EVFILT_WRITE, EV_ADD, 0, 0, ev);
+    else
+      EV_SET(&change, ev->fd, EVFILT_READ, EV_ADD, 0, 0, ev);
     if(kevent(kqueuefd, &change, 1, nullptr, 0, nullptr) == -1)
     {
       delete ev;