#define TIOCOUTQ FIONWRITE
#endif
+/*
+ * O_CLOEXEC is not available everywhere, fallback to not setting the
+ * flag on those systems.
+ */
+#ifndef _WIN32
+#ifndef O_CLOEXEC
+#define O_CLOEXEC 0
+#endif
+#endif
+
/* Non-standard baudrates are not available everywhere. */
#if (defined(HAVE_TERMIOS_SPEED) || defined(HAVE_TERMIOS2_SPEED)) && HAVE_DECL_BOTHER
#define USE_TERMIOS_SPEED