Re: [Qemu-devel] [PATCH 1/2] io/channel: add qio_channel_set_keepalive

["Daniel P. Berrangé" <berrange@redhat.com>]

On Wed, Jun 05, 2019 at 01:09:12PM +0300, Vladimir Sementsov-Ogievskiy wrote:
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> ---
>  include/io/channel.h | 13 +++++++++++++
>  io/channel-socket.c  | 19 +++++++++++++++++++
>  io/channel.c         | 14 ++++++++++++++
>  3 files changed, 46 insertions(+)
> 
> diff --git a/include/io/channel.h b/include/io/channel.h
> index 59460cb1ec..34d871a414 100644
> --- a/include/io/channel.h
> +++ b/include/io/channel.h
> @@ -124,6 +124,9 @@ struct QIOChannelClass {
>      int (*io_set_blocking)(QIOChannel *ioc,
>                             bool enabled,
>                             Error **errp);
> +    int (*io_set_keepalive)(QIOChannel *ioc,
> +                            bool enabled,
> +                            Error **errp);
>  
>      /* Optional callbacks */
>      int (*io_shutdown)(QIOChannel *ioc,
> @@ -490,6 +493,16 @@ int qio_channel_set_blocking(QIOChannel *ioc,
>                               bool enabled,
>                               Error **errp);
>  
> +/*
> + * qio_channel_set_keepalive:
> + * @ioc: the channel object
> + * @enabled: the keepalive flag state
> + * @errp: pointer to a NULL-initialized error object
> + */

Missing docs for the return value. SHould be

  "Returns 0 on success, -1 on error."

note we do *not* return "-errno" values in QIOChannel APIs

> +int qio_channel_set_keepalive(QIOChannel *ioc,
> +                              bool enabled,
> +                              Error **errp);
> +

> diff --git a/io/channel-socket.c b/io/channel-socket.c
> index bc5f80e780..5c1ea08660 100644
> --- a/io/channel-socket.c
> +++ b/io/channel-socket.c
> @@ -656,6 +656,24 @@ qio_channel_socket_set_blocking(QIOChannel *ioc,
>  }
>  
>  
> +static int
> +qio_channel_socket_set_keepalive(QIOChannel *ioc,
> +                                 bool enabled,
> +                                 Error **errp)
> +{
> +    QIOChannelSocket *sioc = QIO_CHANNEL_SOCKET(ioc);
> +    int val = enabled;
> +    int ret = qemu_setsockopt(sioc->fd, SOL_SOCKET, SO_KEEPALIVE,
> +                              &val, sizeof(val));
> +
> +    if (ret < 0) {
> +        error_setg_errno(errp, errno, "Unable to set KEEPALIVE");

Add 'return -1' there to be explicit, avoiding need to read up on
whether qemu_setsockopt returns -1 or -errno.  (It returns -1)

> +    }
> +
> +    return ret;
> +}
> +
> +
>  static void
>  qio_channel_socket_set_delay(QIOChannel *ioc,
>                               bool enabled)
> @@ -762,6 +780,7 @@ static void qio_channel_socket_class_init(ObjectClass *klass,
>      ioc_klass->io_writev = qio_channel_socket_writev;
>      ioc_klass->io_readv = qio_channel_socket_readv;
>      ioc_klass->io_set_blocking = qio_channel_socket_set_blocking;
> +    ioc_klass->io_set_keepalive = qio_channel_socket_set_keepalive;
>      ioc_klass->io_close = qio_channel_socket_close;
>      ioc_klass->io_shutdown = qio_channel_socket_shutdown;
>      ioc_klass->io_set_cork = qio_channel_socket_set_cork;
> diff --git a/io/channel.c b/io/channel.c
> index 2a26c2a2c0..0f0b2b7b65 100644
> --- a/io/channel.c
> +++ b/io/channel.c
> @@ -265,6 +265,20 @@ int qio_channel_set_blocking(QIOChannel *ioc,
>      return klass->io_set_blocking(ioc, enabled, errp);
>  }
>  
> +int qio_channel_set_keepalive(QIOChannel *ioc,
> +                              bool enabled,
> +                              Error **errp)
> +{
> +    QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc);
> +
> +    if (!klass->io_set_keepalive) {
> +        error_setg(errp, "KEEPALIVE is not supported by IO channel");
> +        return -ENOTSUP;

return -1;

> +    }
> +
> +    return klass->io_set_keepalive(ioc, enabled, errp);
> +}
> +
>  
>  int qio_channel_close(QIOChannel *ioc,
>                        Error **errp)

Regards,
Daniel
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