Date: Fri, 12 Jan 2024 11:18:23 -0800 From: bob prohaska <fbsd@www.zefox.net> To: Mark Millard <marklmi@yahoo.com> Cc: freebsd-arm@freebsd.org Subject: Re: USB-serial adapter suggestions needed Message-ID: <ZaGQfy8u2xYzztri@www.zefox.net> In-Reply-To: <A1F3092A-CEB1-44DE-ADB3-F45113004B34@yahoo.com> References: <ZZ7fBDxYd8Yyw5fm@www.zefox.net> <E769A770-8D23-4EFC-8E75-F0ACF6705C4E@yahoo.com> <55AC6824-587D-4C67-B64B-2045A1112F69@yahoo.com> <ZZ8ugUkEDXbSUjZp@www.zefox.net> <041F74B4-3D44-4364-9EBD-9F21A4F3B313@yahoo.com> <ZaBLnwaHWYedwY9m@www.zefox.net> <902798B1-2B66-4ECD-BDAC-195C85066FE6@yahoo.com> <8B4C76B2-707E-4978-9CB3-5D547303A7E5@yahoo.com> <ZaFoY58MqBv9hX5b@www.zefox.net> <A1F3092A-CEB1-44DE-ADB3-F45113004B34@yahoo.com>
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On Fri, Jan 12, 2024 at 10:34:11AM -0800, Mark Millard wrote:
>
> If you did not specify the signal explicitly, you tried:
>
> 15 SIGTERM terminate process software termination signal
>
> (I'm not claiming all those "terminate process" signals are
> likely to be involved. But SIGTERM is need not be involved
> at all.)
>
> > Both the ssh connection from workstation to terminal
> > server and the su to root needed to run tip survive.
> >
> > I should apologize for not testing this sooner, it
> > was a very easy experiment. If you think of useful
> > variations please indicate them.
>
> See above, in particular SIGHUP .
>
Just tried SIGHUP several times. The ssh connection didn't
disconnect. There were also no reports about overriding stale
locks.
Using SIGKILL reported:
login: Killed
root@nemesis:/home/bob #
root@nemesis:/home/bob # tip ucom
Stale lock on cuaU0 PID=45604... overriding.
connected
FreeBSD/arm (ns2.zefox.net) (ttyu0)
but the ssh session and su survived.
Finally, I tried SIGSTOP. Again, ssh and su stayed up, but
restarting tip reported:
all ports busy
Power-cycling the usb-serial adpter with usbconfig
isn't able to free the port. That's new-to-me behavior.
Deleting the /dev/cuaU0-related files didn't help.
Not sure what to make of this, except that ssh survives
exit of tip, graceful or not.
Thanks for reading!
bob prohaska
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