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subprocesses die after SIGCONT?

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Michal Maruška

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Jun 2, 2002, 8:15:29 AM6/2/02
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i run this script:

#!/usr/bin/scsh -s
!#
;; test
(display "start test\n")
(run (sleep 5s))
(display "ok\n")


now i press C-z (i'm in zsh), and with "fg" i resume the process. But (if SLEEP was
running), the process does not finish.

Can anybody else see it ?

i think it's 0.6.2.


when i run PS i get:

after C-z:
5714 0.0 0.0 1592 528 pts/162 TN 14:11 0:00 sleep 5s

after fg:
5714 0.0 0.0 0 0 pts/162 ZN 14:11 0:00 [sleep <defunct>]

Chris Beggy

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Jun 3, 2002, 11:04:16 AM6/3/02
to
m...@maruska.dyndns.org (Michal Maruška) writes:

> i run this script:
>
> #!/usr/bin/scsh -s
> !#
> ;; test
> (display "start test\n")
> (run (sleep 5s))
> (display "ok\n")
>
>
>
>
> now i press C-z (i'm in zsh), and with "fg" i resume the process. But (if SLEEP was
> running), the process does not finish.
>
> Can anybody else see it ?

I see it with bash gnu/linux 2.2.13, scsh-0.6.2.

Chris

Chad Dougherty

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Jun 3, 2002, 11:31:28 AM6/3/02
to

I see it with both zsh-4.0.4 and /bin/sh (which happens to be
KSH_VERSION='@(#)PD KSH v5.2.14 99/07/13.2') under OpenBSD-3.1.
I'm using scsh built from the latest CVS sources.

The weirdest part is that if you stop it, then type fg in a VERY
short time, it seems to do the right thing. If you leave it stopped
for a few whole seconds, then fg it, it just sits there.

-Chad

Martin Gasbichler

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Jun 10, 2002, 4:59:42 AM6/10/02
to

>>>>> "Chad" == Chad Dougherty <ch...@stalphonsos.com> writes:

Chad> On Mon, Jun 03, 2002 at 11:04:16AM -0400, Chris Beggy wrote:
>> m...@maruska.dyndns.org (Michal Maruška) writes:
>>
>> > i run this script:
>> >
>> > #!/usr/bin/scsh -s
>> > !#
>> > ;; test
>> > (display "start test\n")
>> > (run (sleep 5s))
>> > (display "ok\n")
>> >
>> >
>> >
>> >
>> > now i press C-z (i'm in zsh), and with "fg" i resume the process. But (if SLEEP was
>> > running), the process does not finish.
>> >
>> > Can anybody else see it ?
>>
>> I see it with bash gnu/linux 2.2.13, scsh-0.6.2.
>>

Chad> I see it with both zsh-4.0.4 and /bin/sh (which happens to be
Chad> KSH_VERSION='@(#)PD KSH v5.2.14 99/07/13.2') under OpenBSD-3.1.
Chad> I'm using scsh built from the latest CVS sources.

Chad> The weirdest part is that if you stop it, then type fg in a VERY
Chad> short time, it seems to do the right thing. If you leave it stopped
Chad> for a few whole seconds, then fg it, it just sits there.

After the "fg" scsh receives a SIGCONT and a SIGCHLD within a very
short time. Due to a bug in the VM, the SIGCHLD is dropped and scsh
will continue to wait for its child to terminate. I fixed this in CVS.

Thanks for the reports!

--
Martin

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