static int slip_open()

in drivers/slip_user.c [123:189]

• 61 lines of code
• 8 McCabe index (conditional complexity)

static int slip_open(void *data)
{
	struct slip_data *pri = data;
	char version_buf[sizeof("nnnnn\0")];
	char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
	char *argv[] = { "uml_net", version_buf, "slip", "up", gate_buf,
			 NULL };
	int sfd, mfd, err;

	err = get_pty();
	if (err < 0) {
		printk(UM_KERN_ERR "slip-open : Failed to open pty, err = %d\n",
		       -err);
		goto out;
	}
	mfd = err;

	err = open(ptsname(mfd), O_RDWR, 0);
	if (err < 0) {
		printk(UM_KERN_ERR "Couldn't open tty for slip line, "
		       "err = %d\n", -err);
		goto out_close;
	}
	sfd = err;

	err = set_up_tty(sfd);
	if (err)
		goto out_close2;

	pri->slave = sfd;
	pri->slip.pos = 0;
	pri->slip.esc = 0;
	if (pri->gate_addr != NULL) {
		sprintf(version_buf, "%d", UML_NET_VERSION);
		strcpy(gate_buf, pri->gate_addr);

		err = slip_tramp(argv, sfd);

		if (err < 0) {
			printk(UM_KERN_ERR "slip_tramp failed - err = %d\n",
			       -err);
			goto out_close2;
		}
		err = os_get_ifname(pri->slave, pri->name);
		if (err < 0) {
			printk(UM_KERN_ERR "get_ifname failed, err = %d\n",
			       -err);
			goto out_close2;
		}
		iter_addresses(pri->dev, open_addr, pri->name);
	}
	else {
		err = os_set_slip(sfd);
		if (err < 0) {
			printk(UM_KERN_ERR "Failed to set slip discipline "
			       "encapsulation - err = %d\n", -err);
			goto out_close2;
		}
	}
	return mfd;
out_close2:
	close(sfd);
out_close:
	close(mfd);
out:
	return err;
}