[RndTbl] Linux "write"

Trevor Cordes trevor at tecnopolis.ca
Sat Jul 1 04:31:57 CDT 2017


On 2017-06-28 Gilles Detillieux wrote:
> 
> Not that I'm defending systemd in any way (perish the thought!), but
> I'm wondering if it might have something more basic and Unix-y behind
> it. Does it matter whether you have actual login shells on your ttys?
> I.e. does write depend on entries in /run/utmp or /var/log/wtmp? Do
> your ttys show up in a who listing on both the systems that work and
> those that don't? If not, try something else like the -ls option to
> xterm, or a login via ssh.

Good ideas.  No: my ptys don't show up in who.  And I'm using
gnome-terminal.  So I tried your xterm -ls idea and write works fine
between xterms!  So it's a gnome-term or vte's fault then.  I tried
xterm without -ls and it still works.  In fact, xterms still show up in
who even without -ls.

Interesting, who doesn't show any entry for any gnome-term pts, just 1
entry for the X/dm session I assume.  And gnome-term doesn't have any
option for -ls (doesn't have very many options at all as they
continually dumb it down).

I'll file a bz against gnome-term / vte for this as I'm pretty sure
it's supposed to work.  And I know it used to, last year this worked no
problem.  Big changes always occurring in vte so I'm not too surprised.

Thanks Detillieux brothers!


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