+/* Most Linux architectures and drivers support arbitrary baud rate values via BOTHER */
+#ifdef TCGETS2
+ if (!baud_rate) {
+ struct termios2 tios2;
+ if (ioctl(tty_fd, TCGETS2, &tios2) == 0) {
+ if (inspeed) {
+ tios2.c_cflag &= ~CBAUD;
+ tios2.c_cflag |= BOTHER;
+ tios2.c_ispeed = inspeed;
+ tios2.c_ospeed = inspeed;
+#ifdef TCSETS2
+ if (ioctl(tty_fd, TCSETS2, &tios2) == 0)
+ baud_rate = inspeed;
+#endif
+ } else {
+ if ((tios2.c_cflag & CBAUD) == BOTHER && tios2.c_ospeed)
+ baud_rate = tios2.c_ospeed;
+ }
+ }
+ }
+#endif
+
+/*
+ * We can't proceed if the serial port baud rate is unknown,
+ * since that implies that the serial port is disabled.
+ */
+ if (!baud_rate) {
+ if (inspeed)
+ fatal("speed %d not supported", inspeed);
+ else
+ fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
+ }
+