0 on success, or -1 with errno set.EventLoop.rearmIo
Re-arm an I/O watcher without changing its interest mask.
This is a no-op on the Linux epoll backend when using level-triggered mode (the default), because epoll re-evaluates readiness on every epoll_wait call. It exists for API parity with kqueue where edge-triggered (EV_CLEAR) filters need explicit re-arming.
Parameters
token | Registered I/O watcher token. |