netdev - Re: [PATCH iproute2] ip link: don't stop batch processing

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Date:   Fri, 3 Aug 2018 11:08:58 -0700
From:   Dave Taht <dave.taht@...il.com>
To:     mcroce@...hat.com
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH iproute2] ip link: don't stop batch processing

On Fri, Aug 3, 2018 at 10:50 AM Matteo Croce <mcroce@...hat.com> wrote:
>
> When 'ip link show dev DEVICE' is processed in a batch mode, ip exits
> and stop processing further commands.
> This because ipaddr_list_flush_or_save() calls exit() to avoid printing
> the link information twice.
> Replace the exit with a classic goto out instruction.
>
> Signed-off-by: Matteo Croce <mcroce@...hat.com>

one thing I noticed in iproute2-next last week is that

( echo qdisc show dev eno1; sleep 5; echo qdisc show dev eno1; ) | tc -b -

batches the whole thing up to emerge on exit, only.

It didn't used to do that, the output of every command came out as it
completed. I used to use that to timestamp and save the overhead of
invoking the tc utility on openwrt while monitoring qdisc stats in
https://github.com/tohojo/flent/blob/master/misc/tc_iterate.c

alternatively adding timed/timestamped output to tc like -c count or
-I interval would be useful.

> ---
>  ip/ipaddress.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/ip/ipaddress.c b/ip/ipaddress.c
> index 6c306ab7..b7b78f6e 100644
> --- a/ip/ipaddress.c
> +++ b/ip/ipaddress.c
> @@ -1920,7 +1920,7 @@ static int ipaddr_list_flush_or_save(int argc, char **argv, int action)
>                         exit(1);
>                 }
>                 delete_json_obj();
> -               exit(0);
> +               goto out;
>         }
>
>         if (filter.family != AF_PACKET) {
> --
> 2.17.1
>


-- 

Dave Täht
CEO, TekLibre, LLC
http://www.teklibre.com
Tel: 1-669-226-2619