Re: [PATCH v2] char: rename CharBackend->CharFrontend

[Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>]

On 22/10/25 09:46, marcandre.lureau@xxxxxxxxxx wrote:
> From: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
>
> The actual backend is "Chardev", CharBackend is the frontend side of
> it (whatever talks to the backend), let's rename it for readability.
>
> Signed-off-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>
> ---
>   chardev/chardev-internal.h           |  12 +-
>   include/chardev/char-fe.h            |  67 +++++----
>   include/chardev/char.h               |   4 +-
...

> diff --git a/chardev/chardev-internal.h b/chardev/chardev-internal.h
> index 9752dd75f7..8ea10414ab 100644
> --- a/chardev/chardev-internal.h
> +++ b/chardev/chardev-internal.h
> @@ -37,9 +37,9 @@
>   struct MuxChardev {
>       Chardev parent;
>       /* Linked frontends */
> -    CharBackend *backends[MAX_MUX];
> -    /* Linked backend */
> -    CharBackend chr;
> +    CharFrontend *frontends[MAX_MUX];
> +    /* frontend of the underlying muxed chardev */
> +    CharFrontend chr;
>       unsigned long mux_bitset;
>       int focus;
>       bool term_got_escape;
> diff --git a/include/chardev/char-fe.h b/include/chardev/char-fe.h
> index 8ef05b3dd0..7901856f95 100644
> --- a/include/chardev/char-fe.h
> +++ b/include/chardev/char-fe.h
> @@ -8,12 +8,12 @@ typedef void IOEventHandler(void *opaque, QEMUChrEvent event);
>   typedef int BackendChangeHandler(void *opaque);
>   
>   /**
> - * struct CharBackend - back end as seen by front end
> + * struct CharFrontend - Chardev as seen by front end
>    * @fe_is_open: the front end is ready for IO
>    *
>    * The actual backend is Chardev
>    */
> -struct CharBackend {
> +struct CharFrontend {
>       Chardev *chr;
>       IOEventHandler *chr_event;
>       IOCanReadHandler *chr_can_read;
> @@ -27,53 +27,52 @@ struct CharBackend {
>   /**
>    * qemu_chr_fe_init:
>    *
> - * Initializes a front end for the given CharBackend and
> - * Chardev. Call qemu_chr_fe_deinit() to remove the association and
> - * release the driver.
> + * Initializes the frontend @c for the given Chardev backend @s. Call
> + * qemu_chr_fe_deinit() to remove the association and release the backend.
>    *
>    * Returns: false on error.
>    */
> -bool qemu_chr_fe_init(CharBackend *b, Chardev *s, Error **errp);
> +bool qemu_chr_fe_init(CharFrontend *c, Chardev *s, Error **errp);
IMO even clearer for this API would be to use:

  bool qemu_chr_fe_init(CharFrontend *fe, Chardev *be, Error **errp);

and update documentation accordingly.

>   
>   /**
>    * qemu_chr_fe_deinit:
> - * @b: a CharBackend
> + * @c: a CharFrontend
>    * @del: if true, delete the chardev backend
>   *
> - * Dissociate the CharBackend from the Chardev.
> + * Dissociate the CharFrontend from the Chardev.
>    *
>    * Safe to call without associated Chardev.
>    */
> -void qemu_chr_fe_deinit(CharBackend *b, bool del);
> +void qemu_chr_fe_deinit(CharFrontend *c, bool del);
>   
>   /**
>    * qemu_chr_fe_get_driver:
>    *
> - * Returns: the driver associated with a CharBackend or NULL if no
> + * Returns: the driver associated with a CharFrontend or NULL if no
>    * associated Chardev.
>    * Note: avoid this function as the driver should never be accessed directly,
>    *       especially by the frontends that support chardevice hotswap.
>    *       Consider qemu_chr_fe_backend_connected() to check for driver 
> existence
>    */
> -Chardev *qemu_chr_fe_get_driver(CharBackend *be);
> +Chardev *qemu_chr_fe_get_driver(CharFrontend *c);
>   
>   /**
>    * qemu_chr_fe_backend_connected:
>    *
> - * Returns: true if there is a chardevice associated with @be.
> + * Returns: true if there is a backend associated with @c.
>    */
> -bool qemu_chr_fe_backend_connected(CharBackend *be);
> +bool qemu_chr_fe_backend_connected(CharFrontend *c);
LGTM otherwise!