+ baud_rate = inspeed;
+
+ if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
+ syslog(LOG_ERR, "tcsetattr: %m");
+ die(1);
+ }
+
+ restore_term = 1;
+}
+
+/*
+ * restore_tty - restore the terminal to the saved settings.
+ */
+void
+restore_tty()
+{
+ if (restore_term) {
+ if (!default_device) {
+ /*
+ * Turn off echoing, because otherwise we can get into
+ * a loop with the tty and the modem echoing to each other.
+ * We presume we are the sole user of this tty device, so
+ * when we close it, it will revert to its defaults anyway.
+ */
+ inittermios.c_lflag &= ~(ECHO | ECHONL);
+ }
+ if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
+ if (errno != ENXIO)
+ syslog(LOG_WARNING, "tcsetattr: %m");
+ restore_term = 0;
+ }
+}
+
+/*
+ * setdtr - control the DTR line on the serial port.
+ * This is called from die(), so it shouldn't call die().
+ */
+setdtr(fd, on)
+int fd, on;
+{
+ int modembits = TIOCM_DTR;
+
+ ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
+}
+
+
+/*
+ * open_loopback - open the device we use for getting packets
+ * in demand mode. Here we use a pty.
+ */
+int
+open_loopback()
+{
+ int flags;
+ struct termios tios;
+
+ if (openpty(&loop_master, &loop_slave, loop_name, NULL, NULL) < 0) {
+ syslog(LOG_ERR, "No free pty for loopback");
+ die(1);
+ }
+ SYSDEBUG((LOG_DEBUG, "using %s for loopback", loop_name));
+ if (tcgetattr(loop_slave, &tios) == 0) {
+ tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
+ tios.c_cflag |= CS8 | CREAD;
+ tios.c_iflag = IGNPAR;
+ tios.c_oflag = 0;
+ tios.c_lflag = 0;
+ if (tcsetattr(loop_slave, TCSAFLUSH, &tios) < 0)
+ syslog(LOG_WARNING, "couldn't set attributes on loopback: %m");
+ }
+ if ((flags = fcntl(loop_slave, F_GETFL)) != -1)
+ if (fcntl(loop_slave, F_SETFL, flags | O_NONBLOCK) == -1)
+ syslog(LOG_WARNING, "couldn't set loopback to nonblock: %m");
+ if ((flags = fcntl(loop_master, F_GETFL)) != -1)
+ if (fcntl(loop_master, F_SETFL, flags | O_NONBLOCK) == -1)
+ syslog(LOG_WARNING, "couldn't set loopback(m) to nonblock: %m");
+ return loop_slave;