No way.

No justification provided for anyone to want this feature.

> maybe someone else does find this usable :)
> will loop to find the first available cua line unless -r or line_path
> chosen before open(), so this does not really change the mostly
> expected behaviour i can think of; only does make cua00 little less special.
> 
> -Artturi
> 
> 
> diff --git a/usr.bin/cu/cu.c b/usr.bin/cu/cu.c
> index 03a2df4181f..b4b07a924c6 100644
> --- a/usr.bin/cu/cu.c
> +++ b/usr.bin/cu/cu.c
> @@ -44,6 +44,7 @@ struct bufferevent  *output_ev;
>  int                   is_direct = -1;
>  int                   restricted = 0;
>  const char           *line_path = NULL;
> +int                   line_loop = 0;
>  int                   line_speed = -1;
>  int                   line_fd;
>  struct termios                line_tio;
> @@ -149,8 +150,10 @@ main(int argc, char **argv)
>               }
>       }
>  
> -     if (line_path == NULL)
> -             line_path = "/dev/cua00";
> +     if (line_path == NULL) {
> +             line_path = "cua00";
> +             line_loop = restricted ? 0 : 1;
> +     }
>       if (line_speed == -1)
>               line_speed = 9600;
>       if (is_direct == -1)
> @@ -165,7 +168,18 @@ main(int argc, char **argv)
>       flags = O_RDWR;
>       if (is_direct)
>               flags |= O_NONBLOCK;
> -     line_fd = open(line_path, flags);
> +     for (;;) {
> +             line_fd = open(line_path, flags);
> +             if (!(line_fd < 0) || line_loop == 0 || line_loop > 20)
> +                     break;
> +             warn("open(\"%s\")", line_path);
> +             free(line_path);
> +             if (asprintf(&line_path, "%s%s%d", _PATH_DEV,
> +                 line_loop < 11 ? "cua0" : "cuaU",
> +                 line_loop - (line_loop < 11 ? 1 : 11)) == -1)
> +                     err(1, "asprintf");
> +             line_loop++;
> +     }
>       if (line_fd < 0)
>               err(1, "open(\"%s\")", line_path);
>       if (restricted && pledge("stdio tty", NULL) == -1)
> 

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