--- /dev/null
+Index: scheduler/select.c
+===================================================================
+--- scheduler/select.c (revision 8887)
++++ scheduler/select.c (working copy)
+@@ -454,7 +454,7 @@
+ if (fdptr->read_cb && event->filter == EVFILT_READ)
+ (*(fdptr->read_cb))(fdptr->data);
+
+- if (fdptr->write_cb && event->filter == EVFILT_WRITE)
++ if (fdptr->use > 1 && fdptr->write_cb && event->filter == EVFILT_WRITE)
+ (*(fdptr->write_cb))(fdptr->data);
+
+ release_fd(fdptr);
+@@ -499,7 +499,8 @@
+ if (fdptr->read_cb && (event->events & (EPOLLIN | EPOLLERR | EPOLLHUP)))
+ (*(fdptr->read_cb))(fdptr->data);
+
+- if (fdptr->write_cb && (event->events & (EPOLLOUT | EPOLLERR | EPOLLHUP)))
++ if (fdptr->use > 1 && fdptr->write_cb &&
++ (event->events & (EPOLLOUT | EPOLLERR | EPOLLHUP)))
+ (*(fdptr->write_cb))(fdptr->data);
+
+ release_fd(fdptr);
+@@ -590,7 +591,8 @@
+ if (fdptr->read_cb && (pfd->revents & (POLLIN | POLLERR | POLLHUP)))
+ (*(fdptr->read_cb))(fdptr->data);
+
+- if (fdptr->write_cb && (pfd->revents & (POLLOUT | POLLERR | POLLHUP)))
++ if (fdptr->use > 1 && fdptr->write_cb &&
++ (pfd->revents & (POLLOUT | POLLERR | POLLHUP)))
+ (*(fdptr->write_cb))(fdptr->data);
+
+ release_fd(fdptr);
+@@ -645,7 +647,8 @@
+ if (fdptr->read_cb && FD_ISSET(fdptr->fd, &cupsd_current_input))
+ (*(fdptr->read_cb))(fdptr->data);
+
+- if (fdptr->write_cb && FD_ISSET(fdptr->fd, &cupsd_current_output))
++ if (fdptr->use > 1 && fdptr->write_cb &&
++ FD_ISSET(fdptr->fd, &cupsd_current_output))
+ (*(fdptr->write_cb))(fdptr->data);
+
+ release_fd(fdptr);