sigfd_w
if (ev_is_active (&sigfd_w))
ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);
ev_set_priority (&sigfd_w, EV_MAXPRI);
ev_io_start (EV_A_ &sigfd_w);
VARx(ev_io, sigfd_w)
#define sigfd_w ((loop)->sigfd_w)