Re: [Qemu-devel] [PATCH v1 16/21] char: remove qemu_chr_open_socket_fd method

[Paolo Bonzini <pbonzini@redhat.com>]

On 09/03/2016 18:28, Daniel P. Berrange wrote:
> The qemu_chr_open_socket_fd method takes care of either doing a
> synchronous socket connect, or creating a listener socket. Part
> of the work when creating the listener socket is to register a
> watch for incoming clients. The caller of qemu_chr_open_socket_fd
> may not want this watch created, as it might be doing a synchronous
> wait for the first client. Rather than passing yet more parameters
> into qemu_chr_open_socket_fd to let it handle this, just remove
> the qemu_chr_open_socket_fd method an inline its functionality
> into the caller. This allows for a clearer control flow and shorter
> code.
> 
> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
> ---
>  qemu-char.c | 61 +++++++++++++++++++++++++------------------------------------
>  1 file changed, 25 insertions(+), 36 deletions(-)
> 
> diff --git a/qemu-char.c b/qemu-char.c
> index 579c620..fee2540 100644
> --- a/qemu-char.c
> +++ b/qemu-char.c
> @@ -3109,32 +3109,6 @@ static void qemu_chr_socket_connected(Object *src, Error *err, void *opaque)
>      object_unref(OBJECT(sioc));
>  }
>  
> -static bool qemu_chr_open_socket_fd(CharDriverState *chr, Error **errp)
> -{
> -    TCPCharDriver *s = chr->opaque;
> -    QIOChannelSocket *sioc = qio_channel_socket_new();
> -
> -    if (s->is_listen) {
> -        if (qio_channel_socket_listen_sync(sioc, s->addr, errp) < 0) {
> -            goto fail;
> -        }
> -        s->listen_ioc = sioc;
> -        s->listen_tag = qio_channel_add_watch(
> -            QIO_CHANNEL(s->listen_ioc), G_IO_IN, tcp_chr_accept, chr, NULL);
> -    } else {
> -        if (qio_channel_socket_connect_sync(sioc, s->addr, errp) < 0) {
> -            goto fail;
> -        }
> -        tcp_chr_new_client(chr, sioc);
> -        object_unref(OBJECT(sioc));
> -    }
> -
> -    return true;
> -
> - fail:
> -    object_unref(OBJECT(sioc));
> -    return false;
> -}
>  
>  /*********************************************************/
>  /* Ring buffer chardev */
> @@ -4349,26 +4323,41 @@ static CharDriverState *qmp_chardev_open_socket(const char *id,
>          s->reconnect_time = reconnect;
>      }
>  
> +    sioc = qio_channel_socket_new();
> +    qio_channel_set_blocking(QIO_CHANNEL(sioc), true, NULL);

This might not be needed after all.

Paolo

>      if (s->reconnect_time) {
> -        sioc = qio_channel_socket_new();
>          qio_channel_socket_connect_async(sioc, s->addr,
>                                           qemu_chr_socket_connected,
>                                           chr, NULL);
> -    } else if (!qemu_chr_open_socket_fd(chr, errp)) {
> -        goto error;
> -    }
> -
> -    if (is_listen && is_waitconnect) {
> -        fprintf(stderr, "QEMU waiting for connection on: %s\n",
> -                chr->filename);
> -        qio_channel_set_blocking(QIO_CHANNEL(s->listen_ioc), true, NULL);
> -        tcp_chr_accept(QIO_CHANNEL(s->listen_ioc), G_IO_IN, chr);
> +    } else if (s->is_listen) {
> +        if (qio_channel_socket_listen_sync(sioc, s->addr, errp) < 0) {
> +            goto error;
> +        }
> +        s->listen_ioc = sioc;
> +        if (is_waitconnect) {
> +            fprintf(stderr, "QEMU waiting for connection on: %s\n",
> +                    chr->filename);
> +            tcp_chr_accept(QIO_CHANNEL(s->listen_ioc), G_IO_IN, chr);
> +        }
>          qio_channel_set_blocking(QIO_CHANNEL(s->listen_ioc), false, NULL);
> +        if (!s->ioc) {
> +            s->listen_tag = qio_channel_add_watch(
> +                QIO_CHANNEL(s->listen_ioc), G_IO_IN, tcp_chr_accept, chr, NULL);
> +        }
> +    } else {
> +        if (qio_channel_socket_connect_sync(sioc, s->addr, errp) < 0) {
> +            goto error;
> +        }
> +        tcp_chr_new_client(chr, sioc);
> +        object_unref(OBJECT(sioc));
>      }
>  
>      return chr;
>  
>   error:
> +    if (sioc) {
> +        object_unref(OBJECT(sioc));
> +    }
>      if (s->tls_creds) {
>          object_unref(OBJECT(s->tls_creds));
>      }
>