- int init_disc = -1;
- int initfdflags;
-
- local_fd = open(devnam, O_NONBLOCK | O_RDWR, 0);
- if (local_fd < 0) {
- error("Failed to open %s: %m(%d)", devnam, errno);
- return 0;
- }
-
- initfdflags = fcntl(local_fd, F_GETFL);
- if (initfdflags == -1) {
- error("Couldn't get device fd flags: %m(%d)", errno);
- close (local_fd);
+ int mfd = -1;
+ int ret = 0;
+ char slave[16];
+
+ /*
+ * We used to open the serial device and set it to the ppp line
+ * discipline here, in order to create a ppp unit. But that is
+ * not a good idea - the user might have specified a device that
+ * they can't open (permission, or maybe it doesn't really exist).
+ * So we grab a pty master/slave pair and use that.
+ */
+ if (!get_pty(&mfd, &local_fd, slave, 0)) {
+ no_ppp_msg = "Couldn't determine if PPP is supported (no free ptys)";