2602       ssize_t res = read (sigfd, si, sizeof (si));  in sigfdcb()
2888       sigfd              = flags & EVFLAG_SIGNALFD  ? -2 : -1;  in loop_init()
2962     close (sigfd);  in ev_loop_destroy()
4053   if (sigfd == -2)  in ev_signal_start()
4055       sigfd = signalfd (-1, &sigfd_set, SFD_NONBLOCK | SFD_CLOEXEC);  in ev_signal_start()
4056       if (sigfd < 0 && errno == EINVAL)  in ev_signal_start()
4057         sigfd = signalfd (-1, &sigfd_set, 0); /* retry without flags */  in ev_signal_start()
4059       if (sigfd >= 0)  in ev_signal_start()
4061           fd_intern (sigfd); /* doing it twice will not hurt */  in ev_signal_start()
4065           ev_io_init (&sigfd_w, sigfdcb, sigfd, EV_READ);  in ev_signal_start()
4072   if (sigfd >= 0)  in ev_signal_start()
4078       signalfd (sigfd, &sigfd_set, 0);  in ev_signal_start()
4087     if (sigfd < 0) /*TODO*/  in ev_signal_start()
4134       if (sigfd >= 0)  in ev_signal_stop()
4142           signalfd (sigfd, &sigfd_set, 0);  in ev_signal_stop()