Re: [Qemu-devel] [PATCH] qapi: InitSocketAddress: add keepalive option

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

On Thu, Jun 06, 2019 at 01:15:33PM +0300, Vladimir Sementsov-Ogievskiy wrote:
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> ---
> 
> Hi all!
> 
> This is a continuation of "[PATCH v2 0/2] nbd: enable keepalive", but
> it's a try from another side, so almost nothing common with v2.
> 
> 
>  qapi/sockets.json   |  5 ++++-
>  util/qemu-sockets.c | 13 +++++++++++++
>  2 files changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/qapi/sockets.json b/qapi/sockets.json
> index fc81d8d5e8..aefa024051 100644
> --- a/qapi/sockets.json
> +++ b/qapi/sockets.json
> @@ -53,6 +53,8 @@
>  #
>  # @ipv6: whether to accept IPv6 addresses, default try both IPv4 and IPv6
>  #
> +# @keepalive: enable keepalive when connecting to this socket (Since 4.1)
> +#
>  # Since: 1.3
>  ##
>  { 'struct': 'InetSocketAddress',
> @@ -61,7 +63,8 @@
>      '*numeric':  'bool',
>      '*to': 'uint16',
>      '*ipv4': 'bool',
> -    '*ipv6': 'bool' } }
> +    '*ipv6': 'bool',
> +    '*keepalive': 'bool' } }
>  
>  ##
>  # @UnixSocketAddress:
> diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
> index 8850a280a8..d2cd2a9d4f 100644
> --- a/util/qemu-sockets.c
> +++ b/util/qemu-sockets.c
> @@ -457,6 +457,19 @@ int inet_connect_saddr(InetSocketAddress *saddr, Error **errp)
>      }
>  
>      freeaddrinfo(res);
> +
> +    if (saddr->keepalive) {

IIUC, best practice is to use 'saddr->has_keepalive && saddr->keepalive'

> +        int val = 1;
> +        int ret = qemu_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
> +                                  &val, sizeof(val));
> +
> +        if (ret < 0) {
> +            error_setg_errno(errp, errno, "Unable to set KEEPALIVE");
> +            close(sock);
> +            return -1;
> +        }
> +    }
> +
>      return sock;
>  }

Regards,
Daniel
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