Re: bin/55423 (/bin/csh freezes when some interactive programs are suspended)

[Christos Zoulas <christos%zoulas.com@localhost>]

The following reply was made to PR bin/55423; it has been noted by GNATS.

From: Christos Zoulas <christos%zoulas.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: gnats-admin%netbsd.org@localhost,
 netbsd-bugs%netbsd.org@localhost,
 kd%panix.com@localhost
Subject: Re: bin/55423 (/bin/csh freezes when some interactive programs are
 suspended)
Date: Wed, 7 Jul 2021 09:54:33 +0300

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 As I mentioned before, this happens only with shells that don't use =
 command line
 editing. (csh and sh by default). Others that do (bash, tcsh, ash, zsh) =
 reset the
 tty modes.
 
 christos
 
 > On Jul 7, 2021, at 3:40 AM, Kenneth Dunlap <kd%panix.com@localhost> wrote:
 >=20
 > The following reply was made to PR bin/55423; it has been noted by =
 GNATS.
 >=20
 > From: Kenneth Dunlap <kd%panix.com@localhost>
 > To: gnats-bugs%netbsd.org@localhost
 > Cc:
 > Subject: Re: bin/55423 (/bin/csh freezes when some interactive =
 programs are
 > suspended)
 > Date: Tue, 6 Jul 2021 20:39:05 -0400
 >=20
 > Quoth David Holland (dholland-bugs%netbsd.org@localhost):
 >> The following reply was made to PR bin/55423; it has been noted by =
 GNATS.
 >>=20
 >> From: David Holland <dholland-bugs%netbsd.org@localhost>
 >> To: gnats-bugs%netbsd.org@localhost
 >> Cc:
 >> Subject: Re: bin/55423 (/bin/csh freezes when some interactive =
 programs are
 >> suspended)
 >> Date: Tue, 6 Jul 2021 23:53:40 +0000
 >>=20
 >> On Sun, Jul 04, 2021 at 08:45:01PM +0000, Robert Elz wrote:
 >>>   |  My guess is that the job control state is borked, but I'm
 >>>   |  not sure how to check that from another shell.
 >>>=20
 >>> My guess is that the terminal is in non-echo (probably) cbreak mode,
 >>> and that ...
 >>>=20
 >>>   |  Probably need to have py38-readline installed for the behavior =
 to
 >>>   |  manifest.
 >>>=20
 >>> that thing, or the application using it, isn't catching SIGTSTP to =
 return
 >>> the terminal to a sane mode before the process suspends.
 >>>=20
 >>> Try blind typing "stty sane^J"  (ie: end with an explicit line feed,
 >>> not carriage-return) and see what happens.
 >>=20
 >> I had tried that but it didn't occur to me to use ^J, so of course it
 >> didn't work and thus seemed completely dead. Oops.
 >>=20
 >> oh well.
 >>=20
 >> To the original submitter: consider filing an upstream python bug
 >> report. Some things using readline fail and others don't, so it's
 >> probably not directly a readline issue. I think.
 >>=20
 >=20
 > But, it is far more than just python which is failing, and it is
 > *only* failing with /bin/csh.  It happens with a wide range of
 > software, as was pointed out in the original bug report.
 >=20
 > [panix5-kd] ~/Misc <0> /bin/csh
 > You have new mail.
 > % irb
 > irb(main):001:0>
 > Suspended
 >=20
 > csh is now frozen
 >=20
 >=20
 > % R
 >=20
 > R version 4.0.3 (2020-10-10) -- "Bunny-Wunnies Freak Out"
 > Copyright (C) 2020 The R Foundation for Statistical Computing
 > Platform: x86_64-unknown-netbsd9.0 (64-bit)
 >=20
 > R is free software and comes with ABSOLUTELY NO WARRANTY.
 > You are welcome to redistribute it under certain conditions.
 > Type 'license()' or 'licence()' for distribution details.
 >=20
 > R is a collaborative project with many contributors.
 > Type 'contributors()' for more information and
 > 'citation()' on how to cite R or R packages in publications.
 >=20
 > Type 'demo()' for some demos, 'help()' for on-line help, or
 > 'help.start()' for an HTML browser interface to help.
 > Type 'q()' to quit R.
 >=20
 >>=20
 > Suspended
 >=20
 > csh is now frozen
 >=20
 >=20
 > [panix5-kd] ~/Misc <0> /bin/csh
 > % erl
 > Erlang/OTP 23 [erts-11.1.6] [source] [64-bit] [smp:3:3] [ds:3:3:10] =
 [async-threads:1] [hipe]
 >=20
 > Eshell V11.1.6  (abort with ^G)
 > 1>
 >    Suspended
 >             %
 >=20
 >=20
 > csh is now frozen.
 >=20
 > Ken
 > --
 > A vacuum is a hell of a lot better than some of the stuff nature fills =
 it with.
 >                                                         --Tennessee =
 Williams
 >=20
 
 
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