set_subprogram_name("");
}
+/* Returns a readable and writable fd for /dev/null, if successful, otherwise
+ * a negative errno value. The caller must not close the returned fd (because
+ * the same fd will be handed out to subsequent callers). */
+static int
+get_null_fd(void)
+{
+ static int null_fd;
+
+ if (!null_fd) {
+ null_fd = open("/dev/null", O_RDWR);
+ if (null_fd < 0) {
+ int error = errno;
+ VLOG_ERR("could not open /dev/null: %s", ovs_strerror(error));
+ null_fd = -error;
+ }
+ }
+
+ return null_fd;
+}
+
/* Close standard file descriptors (except any that the client has requested we
* leave open by calling daemon_save_fd()). If we're started from e.g. an SSH
* session, then this keeps us from holding that session open artificially. */