[Python-bugs-list] [ python-Bugs-439992 ] [win32] KeyboardInterrupt Not Caught

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Bugs item #439992, was opened at 2001-07-10 02:24
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=439992&group_id=5470

Category: Python Interpreter Core
Group: Platform-specific
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: [win32] KeyboardInterrupt Not Caught

Initial Comment:
The following program, run under unix (FreeBSD 4.3) and Windows 2000 SP2
with the command line:  python test.py

In both cases, running python 2.1.

The program works as expected under unix and IDLE on Windows 2000, but it
does *not* catch the interrupt in the command line version of Win32 python...
i.e., The traceback message appears rather than my "Leaving Dodge..." message.


while 1:
    try:
        x = raw_input().upper()
        print x
    except KeyboardInterrupt:
        print "Leaving Dodge...\n"
        break

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>Comment By: Tim Peters (tim_one)
Date: 2001-08-07 08:51

Message:
Logged In: YES 
user_id=31435

For posterity, a delightfully confused section of 
MS's "signal" docs:

"""
Note SIGINT is not supported for any Win32 application 
including Windows NT and Windows 95. When a CTRL+C 
interrupt occurs, Win32 operating systems generate a new 
thread to specifically handle that interrupt. This can 
cause a single-thread application such as UNIX, to become 
multithreaded, resulting in unexpected behavior. 
"""

I kid you not.

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Comment By: Guido van Rossum (gvanrossum)
Date: 2001-08-07 06:59

Message:
Logged In: YES 
user_id=6380

Yes, I'm afraid signal handling doesn't always work on
Windows.
I don't know Windows enough to understand how to fix this.

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You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=439992&group_id=5470