runtime/jdwp/jdwp_adb.cc [315:364]:
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      if (fd >= 0) {
        FD_SET(fd, &readfds);
        if (maxfd < fd) {
          maxfd = fd;
        }
      }
      fd = clientSock;
      if (fd >= 0) {
        FD_SET(fd, &readfds);
        if (maxfd < fd) {
          maxfd = fd;
        }
      }
      fd = wake_pipe_[0];
      if (fd >= 0) {
        FD_SET(fd, &readfds);
        if (maxfd < fd) {
          maxfd = fd;
        }
      } else {
        LOG(INFO) << "NOTE: entering select w/o wakepipe";
      }

      if (maxfd < 0) {
        VLOG(jdwp) << "+++ all fds are closed";
        return false;
      }

      /*
       * Select blocks until it sees activity on the file descriptors.
       * Closing the local file descriptor does not count as activity,
       * so we can't rely on that to wake us up (it works for read()
       * and accept(), but not select()).
       *
       * We can do one of three things: (1) send a signal and catch
       * EINTR, (2) open an additional fd ("wake pipe") and write to
       * it when it's time to exit, or (3) time out periodically and
       * re-issue the select.  We're currently using #2, as it's more
       * reliable than #1 and generally better than #3.  Wastes two fds.
       */
      selCount = select(maxfd + 1, &readfds, nullptr, nullptr, nullptr);
      if (selCount < 0) {
        if (errno == EINTR) {
          continue;
        }
        PLOG(ERROR) << "select failed";
        goto fail;
      }

      if (wake_pipe_[0] >= 0 && FD_ISSET(wake_pipe_[0], &readfds)) {
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runtime/jdwp/jdwp_socket.cc [393:442]:
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      if (fd >= 0) {
        FD_SET(fd, &readfds);
        if (maxfd < fd) {
          maxfd = fd;
        }
      }
      fd = clientSock;
      if (fd >= 0) {
        FD_SET(fd, &readfds);
        if (maxfd < fd) {
          maxfd = fd;
        }
      }
      fd = wake_pipe_[0];
      if (fd >= 0) {
        FD_SET(fd, &readfds);
        if (maxfd < fd) {
          maxfd = fd;
        }
      } else {
        LOG(INFO) << "NOTE: entering select w/o wakepipe";
      }

      if (maxfd < 0) {
        VLOG(jdwp) << "+++ all fds are closed";
        return false;
      }

      /*
       * Select blocks until it sees activity on the file descriptors.
       * Closing the local file descriptor does not count as activity,
       * so we can't rely on that to wake us up (it works for read()
       * and accept(), but not select()).
       *
       * We can do one of three things: (1) send a signal and catch
       * EINTR, (2) open an additional fd ("wake pipe") and write to
       * it when it's time to exit, or (3) time out periodically and
       * re-issue the select.  We're currently using #2, as it's more
       * reliable than #1 and generally better than #3.  Wastes two fds.
       */
      selCount = select(maxfd + 1, &readfds, nullptr, nullptr, nullptr);
      if (selCount < 0) {
        if (errno == EINTR) {
          continue;
        }
        PLOG(ERROR) << "select failed";
        goto fail;
      }

      if (wake_pipe_[0] >= 0 && FD_ISSET(wake_pipe_[0], &readfds)) {
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