+ if (devnam[0] != 0) {
+ for (;;) {
+ /* If the user specified the device name, become the
+ user before opening it. */
+ int err;
+ if (!devnam_info.priv && !privopen)
+ seteuid(uid);
+ ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0);
+ err = errno;
+ if (!devnam_info.priv && !privopen)
+ seteuid(0);
+ if (ttyfd >= 0)
+ break;
+ errno = err;
+ if (err != EINTR) {
+ error("Failed to open %s: %m", devnam);
+ status = EXIT_OPEN_FAILED;
+ }
+ if (!persist || err != EINTR)
+ goto fail;
+ }
+ if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
+ || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
+ warn("Couldn't reset non-blocking mode on device: %m");
+
+ /*
+ * Do the equivalent of `mesg n' to stop broadcast messages.
+ */
+ if (fstat(ttyfd, &statbuf) < 0
+ || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
+ warn("Couldn't restrict write permissions to %s: %m", devnam);
+ } else
+ tty_mode = statbuf.st_mode;
+
+ /*
+ * Set line speed, flow control, etc.
+ * If we have a non-null connection or initializer script,
+ * on most systems we set CLOCAL for now so that we can talk
+ * to the modem before carrier comes up. But this has the
+ * side effect that we might miss it if CD drops before we
+ * get to clear CLOCAL below. On systems where we can talk
+ * successfully to the modem with CLOCAL clear and CD down,
+ * we could clear CLOCAL at this point.
+ */
+ set_up_tty(ttyfd, ((connector != NULL && connector[0] != 0)
+ || initializer != NULL));
+ real_ttyfd = ttyfd;
+ }