static int xterm_open()

in drivers/xterm.c [86:198]

• 88 lines of code
• 13 McCabe index (conditional complexity)

static int xterm_open(int input, int output, int primary, void *d,
		      char **dev_out)
{
	struct xterm_chan *data = d;
	int pid, fd, new, err;
	char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
	char *argv[] = { terminal_emulator, title_switch, title, exec_switch,
			 OS_LIB_PATH "/uml/port-helper", "-uml-socket",
			 file, NULL };

	if (access(argv[4], X_OK) < 0)
		argv[4] = "port-helper";

	/*
	 * Check that DISPLAY is set, this doesn't guarantee the xterm
	 * will work but w/o it we can be pretty sure it won't.
	 */
	if (getenv("DISPLAY") == NULL) {
		printk(UM_KERN_ERR "xterm_open: $DISPLAY not set.\n");
		return -ENODEV;
	}

	/*
	 * This business of getting a descriptor to a temp file,
	 * deleting the file and closing the descriptor is just to get
	 * a known-unused name for the Unix socket that we really
	 * want.
	 */
	fd = mkstemp(file);
	if (fd < 0) {
		err = -errno;
		printk(UM_KERN_ERR "xterm_open : mkstemp failed, errno = %d\n",
		       errno);
		return err;
	}

	if (unlink(file)) {
		err = -errno;
		printk(UM_KERN_ERR "xterm_open : unlink failed, errno = %d\n",
		       errno);
		close(fd);
		return err;
	}
	close(fd);

	fd = os_create_unix_socket(file, sizeof(file), 1);
	if (fd < 0) {
		printk(UM_KERN_ERR "xterm_open : create_unix_socket failed, "
		       "errno = %d\n", -fd);
		return fd;
	}

	sprintf(title, data->title, data->device);
	pid = run_helper(NULL, NULL, argv);
	if (pid < 0) {
		err = pid;
		printk(UM_KERN_ERR "xterm_open : run_helper failed, "
		       "errno = %d\n", -err);
		goto out_close1;
	}

	err = os_set_fd_block(fd, 0);
	if (err < 0) {
		printk(UM_KERN_ERR "xterm_open : failed to set descriptor "
		       "non-blocking, err = %d\n", -err);
		goto out_kill;
	}

	data->chan_fd = fd;
	new = xterm_fd(fd, &data->helper_pid);
	if (new < 0) {
		err = new;
		printk(UM_KERN_ERR "xterm_open : os_rcv_fd failed, err = %d\n",
		       -err);
		goto out_kill;
	}

	err = os_set_fd_block(new, 0);
	if (err) {
		printk(UM_KERN_ERR "xterm_open : failed to set xterm "
		       "descriptor non-blocking, err = %d\n", -err);
		goto out_close2;
	}

	CATCH_EINTR(err = tcgetattr(new, &data->tt));
	if (err) {
		new = err;
		goto out_close2;
	}

	if (data->raw) {
		err = raw(new);
		if (err) {
			new = err;
			goto out_close2;
		}
	}

	unlink(file);
	data->pid = pid;
	*dev_out = NULL;

	return new;

 out_close2:
	close(new);
 out_kill:
	os_kill_process(pid, 1);
 out_close1:
	close(fd);

	return err;
}