[Python-bugs-list] [ python-Bugs-617110 ] SIGINT handler no longer installable.

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Bugs item #617110, was opened at 2002-10-01 18:25
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Category: Python Library
Group: Python 2.2.1
Status: Open
Resolution: None
Priority: 5
Submitted By: Thorstein Thorsteinsson (thorstein)
Assigned to: Nobody/Anonymous (nobody)
Summary: SIGINT handler no longer installable.

Initial Comment:
After the following commands:

>>> import signal
>>> signal.signal(signal.SIGINT,signal.SIG_IGN)
<built-in function default_int_handler>
>>> print signal.getsignal(signal.SIGINT)
1
>>> 

Typing control-C or sending the process a SIGINT leads
to a KeyboardInterrupt exception. Installing a signal
handler instead of SIG_IGN doesn't help. The docs
clearly state that the default handler can be overridden.
Also in python 1.5.2 the above example works as I
would expect - both control-C and SIGINT are ignored
in that version.

I'm running 2.2.1 on Solaris. I have seen the problem
under Linux also.
 
Python 2.2.1 (#1, Jul 16 2002, 15:22:16) 
[GCC 2.95.2 19991024 (release)] on sunos5


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>Comment By: Martin v. Löwis (loewis)
Date: 2002-10-02 16:19

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Can you demonstrate the problem in a self-contained script,
instead of an interactive session? If not, it is likely a
readline issue - not one that we can do much about, so we
would then close this report as "Won't fix".

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Comment By: Thorstein Thorsteinsson (thorstein)
Date: 2002-10-02 15:05

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readline: That seems likely actually. I'm using readline both
on the above installation and on the Linux installation
referred to.

A slightly earlier install without readline works ok:
Python 2.1.1 (#3, Nov 29 2001, 17:41:42) 
[GCC 2.95.2 19991024 (release)] on sunos5

Also, if the Python process isn't connected to a terminal
things work fine.

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Comment By: Michael Hudson (mwh)
Date: 2002-10-02 14:32

Message:
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I find this sort of thing is usually readline's fault.  Is
that possible here?

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