+ the_channel = &tty_channel;
+ xmit_accm[3] = 0x60000000;
+}
+
+/*
+ * tty_process_extra_options - work out which tty device we are using
+ * and read its options file.
+ */
+void tty_process_extra_options()
+{
+ using_pty = notty || ptycommand != NULL || pty_socket != NULL;
+ if (using_pty)
+ return;
+ if (default_device) {
+ char *p;
+ if (!isatty(0) || (p = ttyname(0)) == NULL) {
+ option_error("no device specified and stdin is not a tty");
+ exit(EXIT_OPTION_ERROR);
+ }
+ strlcpy(devnam, p, sizeof(devnam));
+ if (stat(devnam, &devstat) < 0)
+ fatal("Couldn't stat default device %s: %m", devnam);
+ }
+
+
+ /*
+ * Parse the tty options file.
+ * The per-tty options file should not change
+ * ptycommand, pty_socket, notty or devnam.
+ * options_for_tty doesn't override options set on the command line,
+ * except for some privileged options.
+ */
+ if (!options_for_tty())
+ exit(EXIT_OPTION_ERROR);
+}
+
+/*
+ * tty_check_options - do consistency checks on the options we were given.
+ */
+void
+tty_check_options()
+{
+ struct stat statbuf;
+ int fdflags;
+
+ if (demand && notty) {
+ option_error("demand-dialling is incompatible with notty");
+ exit(EXIT_OPTION_ERROR);
+ }
+ if (demand && connect_script == 0 && ptycommand == NULL
+ && pty_socket == NULL) {
+ option_error("connect script is required for demand-dialling\n");
+ exit(EXIT_OPTION_ERROR);
+ }
+ /* default holdoff to 0 if no connect script has been given */
+ if (connect_script == 0 && !holdoff_specified)
+ holdoff = 0;
+
+ if (using_pty) {
+ if (!default_device) {
+ option_error("%s option precludes specifying device name",
+ pty_socket? "socket": notty? "notty": "pty");
+ exit(EXIT_OPTION_ERROR);
+ }
+ if (ptycommand != NULL && notty) {
+ option_error("pty option is incompatible with notty option");
+ exit(EXIT_OPTION_ERROR);
+ }
+ if (pty_socket != NULL && (ptycommand != NULL || notty)) {
+ option_error("socket option is incompatible with pty and notty");
+ exit(EXIT_OPTION_ERROR);
+ }
+ default_device = notty;
+ lockflag = 0;
+ modem = 0;
+ if (notty && log_to_fd <= 1)
+ log_to_fd = -1;
+ } else {
+ /*
+ * If the user has specified a device which is the same as
+ * the one on stdin, pretend they didn't specify any.
+ * If the device is already open read/write on stdin,
+ * we assume we don't need to lock it, and we can open it
+ * as root.
+ */
+ if (fstat(0, &statbuf) >= 0 && S_ISCHR(statbuf.st_mode)
+ && statbuf.st_rdev == devstat.st_rdev) {
+ default_device = 1;
+ fdflags = fcntl(0, F_GETFL);
+ if (fdflags != -1 && (fdflags & O_ACCMODE) == O_RDWR)
+ privopen = 1;
+ }
+ }
+ if (default_device)
+ nodetach = 1;
+
+ /*
+ * Don't send log messages to the serial port, it tends to
+ * confuse the peer. :-)
+ */
+ if (log_to_fd >= 0 && fstat(log_to_fd, &statbuf) >= 0
+ && S_ISCHR(statbuf.st_mode) && statbuf.st_rdev == devstat.st_rdev)
+ log_to_fd = -1;