[RndTbl] Linux "write"

[Gilbert E. Detillieux]

On 28/06/2017 2:51 AM, Trevor Cordes wrote:
> Can someone else confirm this bug on another Linux system, preferably a
> modern one that uses systemd?
> 
> In X, as non-root:
> 
> open a term (call it term1)
> open another term (term2)
> type "tty" in term2, not your tty number/string
> in term1: type "write <your-login> <tty-string-from-above>"
> 
> replace your-login with the output of "who" if you don't know who you are
> logged in as
> 
> please try both /dev/pts/42 and pts/42 format for the tty part of write
> 
> example: write trevor pts/42
> 
> When I run this I get:
> write: trevor is not logged in on pts/42
> 
> Even though I clearly am.  This used to work perfectly up until last year
> (I think), and I think systemd changed something (big surprise).  No
> chatter about this anywhere that I can see.  Probably the last person on
> earth to use write (at least on F24).
> 
> I found some other things to test that indicate that something is really
> amiss:
> 
>> write trevor
> write: trevor has messages disabled
> 
>> mesg
> is y
> 
>> mesg y
> mesg
> is y
> 
>> write trevor
> write: trevor has messages disabled
> 
>> ll /dev/pts/42
> crw--w---- 1 trevor tty 136, 42 Jun 28 02:48 /dev/pts/42
> 
> 
> If someone else can confirm this bug on a non-Fedora (or a newer one) that
> would be great.  If someone can also confirm that the above behaviour is
> insane, that too would be great.  If anyone has some ideas on what to try
> next, shoot away!  Then I'll file a bz.  Thanks!

Works fine for me under SL6.9, SL7.3, and Raspbian/Jessie, all with the 
latest updates including kernel.  Looks like the latest Fedora is 
borked.  (And we all know the likely culprit, don't we...)

Gilbert

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