Debian bug report logs -
#1297, boring messages
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Subject: Bug#1297: nohup doesn't seem to work
Reply-To: Raul Miller <rdm@tad.micro.umn.edu>, debian-bugs@pixar.com
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Date: Wed, 30 Aug 95 18:47 EDT
From: Raul Miller <rdm@tad.micro.umn.edu>
To: debian-bugs@pixar.com
Package: shellutils
Version: 1.12
Revision: 3
I can reliably generate a HUP signal in a program run by nohup. The
general approach is:
rxvt -e sh -c 'nohup testprog & sleep 5'
[The sleep is an arbitrary mechanism to allow the testprog to register
its signal handlers before the HUP is delivered.]
--
Raul
Message sent:
From: iwj10@thor.cam.ac.uk (Ian Jackson)
To: Raul Miller <rdm@tad.micro.umn.edu>
Subject: Bug#1297: Acknowledgement (was: nohup doesn't seem to work)
In-Reply-To: <m0snvvG-0006igC@rdm.legislate.com>
References: <m0snvvG-0006igC@rdm.legislate.com>
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Message sent to debian-devel@pixar.com:
Subject: Bug#1297: nohup doesn't seem to work
Reply-To: Bruce Perens <bruce@Pixar.com>, debian-bugs@pixar.com
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In-Reply-To: Your message of "Wed, 30 Aug 1995 18:47:00 PDT."
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Date: Wed, 30 Aug 1995 16:40:47 -0700
From: Bruce Perens <bruce@Pixar.com>
You aren't registering a handler for SIGHUP, are you? That will invalidate
the action of "nohup".
Bruce
--
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Message sent:
From: iwj10@thor.cam.ac.uk (Ian Jackson)
To: Bruce Perens <bruce@Pixar.com>
Subject: Bug#1297: Info received (was Bug#1297: nohup doesn't seem to work)
In-Reply-To: <m0snwkR-000BgVC@mongo.pixar.com>
References: <m0snwkR-000BgVC@mongo.pixar.com>
Thank you for the additional information you have supplied regarding
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Please do not reply to the address at the top of this message,
unless you wish to report a problem with the bug-tracking system.
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Message sent to debian-devel@pixar.com:
Subject: Bug#1297: nohup doesn't seem to work
Reply-To: Raul Miller <moth@magenta.com>, debian-bugs@pixar.com
Resent-From: Raul Miller <moth@magenta.com>
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Date: Fri, 1 Sep 1995 18:57:36 -0400
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From: Raul Miller <moth@magenta.com>
To: bruce@Pixar.com
Cc: debian-bugs@Pixar.com
In-Reply-To: <m0snwkR-000BgVC@mongo.pixar.com> (message from Bruce Perens on Wed, 30 Aug 1995 16:40:47 -0700)
You aren't registering a handler for SIGHUP, are you? That will invalidate
the action of "nohup".
That makes a certain amount of sense. Hmm, let me check the code for
nohup...
Ok, you're right in that nohup installs a signal handler then execs
the desired program. However, this is a problem under linux.
According to the man page:
Unlike BSD systems, signals under Linux are reset to their
default behavior when raised.
In the case I reported, I'd guess that more than one SIGHUP is being
delivered to the program allegedly protected by nohup. Basically,
this means that it's difficult to come up with a system which pops up
a temporary window to prompt for a password to use in running some
other program.
--
Raul
Message sent:
From: iwj10@thor.cam.ac.uk (Ian Jackson)
To: Raul Miller <moth@magenta.com>
Subject: Bug#1297: Info received (was Bug#1297: nohup doesn't seem to work)
In-Reply-To: <199509012257.SAA00237@magenta.com>
References: <199509012257.SAA00237@magenta.com>
Thank you for the additional information you have supplied regarding
this problem report. It has been forwarded to the developers to
accompany the original report.
If you wish to continue to submit further information on your problem,
please do the same thing again: send it to debian-bugs@pixar.com, ensuring
that the Subject line starts with "Bug#1297" or "Re: Bug#1297" so that
we can identify it as relating to the same problem.
Please do not reply to the address at the top of this message,
unless you wish to report a problem with the bug-tracking system.
Ian Jackson
(maintainer, debian-bugs)
Message sent to debian-devel@pixar.com:
Subject: Bug#1297: nohup doesn't seem to work
Reply-To: Bruce Perens <bruce@Pixar.com>, debian-bugs@pixar.com
Resent-From: Bruce Perens <bruce@Pixar.com>
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To: Raul Miller <moth@magenta.com>, debian-bugs@Pixar.com
Cc: bruce@Pixar.com
In-Reply-To: Your message of "Fri, 01 Sep 1995 18:57:36 PDT."
<199509012257.SAA00237@magenta.com>
Date: Fri, 01 Sep 1995 23:22:27 -0700
From: Bruce Perens <bruce@Pixar.com>
From: Raul Miller <moth@magenta.com>
> Unlike BSD systems, signals under Linux are reset to their
> default behavior when raised.
I think this is a red herring. The signal won't get raised if the handler
is set to SIG_IGN. Moreover, when I run the simple test below, nohup works
correctly. I still suspect something else is getting to the SIGHUP handler
in the test you are running.
Thanks
Bruce
Script started on Fri Sep 1 23:17:33 1995
> bash
bash$ sleep 100 &
[1] 1268
bash$ kill -HUP 1268
bash$
[1]+ Hangup sleep 100
bash$ nohup sleep 100 &
[1] 1269
bash$ nohup: appending output to `nohup.out'
ps
PID TTY STAT TIME COMMAND
135 v01 S 0:01 -tcsh
136 v02 S 0:01 -tcsh
1201 v02 T 0:00 ftp mongo
1259 v02 S 0:00 script
1260 v02 S 0:00 script
1261 pp2 S 0:00 -h -i
1265 pp2 S 0:00 bash
1269 pp2 S N 0:00 sleep 100
1274 pp2 R 0:00 ps
bash$ kill -HUP 1269
bash$ kill -HUP 1269
bash$ kill -HUP 1269
bash$ ps
PID TTY STAT TIME COMMAND
135 v01 S 0:01 -tcsh
136 v02 S 0:01 -tcsh
1201 v02 T 0:00 ftp mongo
1259 v02 S 0:00 script
1260 v02 S 0:00 script
1261 pp2 S 0:00 -h -i
1265 pp2 S 0:00 bash
1269 pp2 S N 0:00 sleep 100
1275 pp2 R 0:00 ps
bash$ exit
exit
> exit
exit
Script done on Fri Sep 1 23:18:25 1995
Message sent:
From: iwj10@thor.cam.ac.uk (Ian Jackson)
To: Bruce Perens <bruce@Pixar.com>
Subject: Bug#1297: Info received (was Bug#1297: nohup doesn't seem to work)
In-Reply-To: <m0solyG-000EppC@mongo.pixar.com>
References: <m0solyG-000EppC@mongo.pixar.com>
Thank you for the additional information you have supplied regarding
this problem report. It has been forwarded to the developers to
accompany the original report.
If you wish to continue to submit further information on your problem,
please do the same thing again: send it to debian-bugs@pixar.com, ensuring
that the Subject line starts with "Bug#1297" or "Re: Bug#1297" so that
we can identify it as relating to the same problem.
Please do not reply to the address at the top of this message,
unless you wish to report a problem with the bug-tracking system.
Ian Jackson
(maintainer, debian-bugs)
Message sent to debian-devel@pixar.com:
Subject: Bug#1297: nohup doesn't seem to work
Reply-To: Raul Miller <moth@magenta.com>, debian-bugs@pixar.com
Resent-From: Raul Miller <moth@magenta.com>
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Date: Sat, 2 Sep 1995 23:55:22 -0400
Message-Id: <199509030355.XAA20235@magenta.com>
From: Raul Miller <moth@magenta.com>
To: bruce@Pixar.com
Cc: debian-bugs@Pixar.com
In-Reply-To: <m0solyG-000EppC@mongo.pixar.com> (message from Bruce Perens on Fri, 01 Sep 1995 23:22:27 -0700)
I think this is a red herring. The signal won't get raised if the
handler is set to SIG_IGN. Moreover, when I run the simple test
below, nohup works correctly. I still suspect something else is
getting to the SIGHUP handler in the test you are running.
[test deleted.]
Ok, perhaps I've completely misdiagnosed what's going on.
Here's my situation: I'm trying to run xdos (from dosemu) as root.
[suid root doesn't work for some features.] So, I need to respond to
the su prompt before I am able to fire up xdos. However, using the
"obvious method" of firing up an rxvt (or, if I remember right, an
xterm) to run the su has the problem that when the rxvt (or xterm)
exits it kills the dos window. nohup won't solve this problem.
>From earlier attempts at getting telnet to do rsh like things under X,
and from some tests I did before submitting this bug report, I believe
that this phenomena is independent of the program I'm running from
inside su. It's also independent of su -- sh -c exhibits the same
symptoms as su -c.
Unfortunately, I'm not going to have access to the machine that has X
installed till tuesday, so I can't run any further tests at this time.
--
Raul
Message sent:
From: iwj10@thor.cam.ac.uk (Ian Jackson)
To: Raul Miller <moth@magenta.com>
Subject: Bug#1297: Info received (was Bug#1297: nohup doesn't seem to work)
In-Reply-To: <199509030355.XAA20235@magenta.com>
References: <199509030355.XAA20235@magenta.com>
Thank you for the additional information you have supplied regarding
this problem report. It has been forwarded to the developers to
accompany the original report.
If you wish to continue to submit further information on your problem,
please do the same thing again: send it to debian-bugs@pixar.com, ensuring
that the Subject line starts with "Bug#1297" or "Re: Bug#1297" so that
we can identify it as relating to the same problem.
Please do not reply to the address at the top of this message,
unless you wish to report a problem with the bug-tracking system.
Ian Jackson
(maintainer, debian-bugs)
Message sent to debian-devel@pixar.com:
Subject: Bug#1297: nohup doesn't seem to work
Reply-To: Bruce Perens <bruce@Pixar.com>, debian-bugs@pixar.com
Resent-From: Bruce Perens <bruce@Pixar.com>
Resent-To: debian-devel@pixar.com
Resent-Date: Sun, 03 Sep 1995 06:03:02 GMT
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To: Raul Miller <moth@magenta.com>
Cc: bruce@Pixar.com, debian-bugs@Pixar.com
In-Reply-To: Your message of "Sat, 02 Sep 1995 23:55:22 PDT."
<199509030355.XAA20235@magenta.com>
Date: Sat, 02 Sep 1995 22:53:39 -0700
From: Bruce Perens <bruce@Pixar.com>
I'm going to close this bug, as it doesn't seem to be a nohup problem.
You might play around with "stty -hup", though I don't know if that will
work.
Bruce
Message sent:
From: iwj10@thor.cam.ac.uk (Ian Jackson)
To: Bruce Perens <bruce@Pixar.com>
Subject: Bug#1297: Info received (was Bug#1297: nohup doesn't seem to work)
In-Reply-To: <m0sp7zv-000Et0C@mongo.pixar.com>
References: <m0sp7zv-000Et0C@mongo.pixar.com>
Thank you for the additional information you have supplied regarding
this problem report. It has been forwarded to the developers to
accompany the original report.
If you wish to continue to submit further information on your problem,
please do the same thing again: send it to debian-bugs@pixar.com, ensuring
that the Subject line starts with "Bug#1297" or "Re: Bug#1297" so that
we can identify it as relating to the same problem.
Please do not reply to the address at the top of this message,
unless you wish to report a problem with the bug-tracking system.
Ian Jackson
(maintainer, debian-bugs)
Ian Jackson /
iwj10@thor.cam.ac.uk,
with the debian-bugs tracking mechanism