netdev - Re: [PATCH] Fix ss Netid column and Local/Peer

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Date:   Mon, 29 Oct 2018 21:06:35 +0100
From:   "Yoann P." <yoann.p.public@...il.com>
To:     Stefano Brivio <sbrivio@...hat.com>
Cc:     netdev@...r.kernel.org,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH] Fix ss Netid column and Local/Peer_Address

> Hi Yohann,
> 
> On Fri, 26 Oct 2018 22:53:32 +0200
> 
> "Yoann P." <yoann.p.public@...il.com> wrote:
> > When using ss -Hutn4 or -utn3, Netid and State columns are sometime
> > merged, it can be confusing when trying to pipe into awk or column.
> 
> Thanks for fixing this. A few comments though:
> > @@ -144,9 +144,9 @@ static struct column columns[] = {
> > 
> >         { ALIGN_LEFT,   "State",                " ",    0, 0, 0 },
> >         { ALIGN_LEFT,   "Recv-Q",               " ",    0, 0, 0 },
> >         { ALIGN_LEFT,   "Send-Q",               " ",    0, 0, 0 },
> > 
> > -       { ALIGN_RIGHT,  "Local Address:",       " ",    0, 0, 0 },
> > +       { ALIGN_RIGHT,  "Local_Address:",       " ",    0, 0, 0 },
> > 
> >         { ALIGN_LEFT,   "Port",                 "",     0, 0, 0 },
> > 
> > -       { ALIGN_RIGHT,  "Peer Address:",        " ",    0, 0, 0 },
> > +       { ALIGN_RIGHT,  "Peer_Address:",        " ",    0, 0, 0 },
> 
> This is needed only if you pipe the output to column(1), I don't think
> it's a bug, because printing the header when you pass the output to
> column(1) makes little sense -- one should use -H then.
I don't really care about this modification, I came across it while making the 
github issue example, seemed to be little change, so I dit it.
> 
> By the way, why do you use column(1), when ss already prints output in
> columns? Any other issue you are working around?
column can hide columns with "-H -" and is a bit faster than awk to output a 
single column according to time, it's the only reason I mentioned it.
> 
> >         { ALIGN_LEFT,   "Port",                 "",     0, 0, 0 },
> >         { ALIGN_LEFT,   "",                     "",     0, 0, 0 },
> >  
> >  };
> > 
> > @@ -1334,7 +1334,7 @@ static void sock_state_print(struct sockstat *s)
> > 
> >                 out("`- %s", sctp_sstate_name[s->state]);
> >         
> >         } else {
> >         
> >                 field_set(COL_NETID);
> > 
> > -               out("%s", sock_name);
> > +               out("%-6s", sock_name);
> 
> I could reproduce this issue with a 70-columns terminal and the options
> you gave.
> 
> Anyway, I don't think this is the right way to fix it: this will waste
> one to two columns in case we have three letters for the Netid
> specifier, and won't work the day we get six-letters names. In general,
> it looks like a bad idea to reintroduce hardcoded width counts.
I agree, I just not found the proper way to do it (Not a programmer).
> 
> The actual issue seems to be that in some cases the left delimiter for
> the State column is not printed, and I think you should fix that
> instead. I'll look into this within a couple of days and give you some
> more specific hints in case you still need them by then.