[Qemu-devel] Re: [PATCH] add close callback for tty-based char device

["David S. Ahern" <daahern@cisco.com>]

I have not seen response to this. If there are no objections please apply.

Thanks,

David Ahern


On 02/03/2010 09:18 AM, David S. Ahern wrote:
> Add a tty close callback. Right now if a guest device that is connected
> to a tty-based chardev in the host is removed, the tty is not closed.
> With this patch it is closed.
> 
> Example use case is connecting an emulated USB serial cable in the guest
> to tty0 of the host using the monitor command:
> 
> usb_add serial::/dev/tty0
> 
> and then removing the device with:
> 
> usb_del serial::/dev/tty0
> 
> Signed-off-by: David Ahern <daahern@cisco.com>
> 
> diff --git a/qemu-char.c b/qemu-char.c
> index 800ee6c..ecd84ec 100644
> --- a/qemu-char.c
> +++ b/qemu-char.c
> @@ -1173,6 +1173,20 @@ static int tty_serial_ioctl(CharDriverState *chr,
> int cmd
>      return 0;
>  }
> 
> +static void qemu_chr_close_tty(CharDriverState *chr)
> +{
> +    FDCharDriver *s = chr->opaque;
> +    int fd = -1;
> +
> +    if (s)
> +        fd = s->fd_in;
> +
> +    fd_chr_close(chr);
> +
> +    if (fd >= 0)
> +        close(fd);
> +}
> +
>  static CharDriverState *qemu_chr_open_tty(QemuOpts *opts)
>  {
>      const char *filename = qemu_opt_get(opts, "path");
> @@ -1187,6 +1201,7 @@ static CharDriverState *qemu_chr_open_tty(QemuOpts
> *opts)
>          return NULL;
>      }
>      chr->chr_ioctl = tty_serial_ioctl;
> +    chr->chr_close = qemu_chr_close_tty;
>      return chr;
>  }
>  #else  /* ! __linux__ && ! __sun__ */
> 
> --
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