[Python-bugs-list] [ python-Bugs-549081 ] test_signal hangs -- signal broken on OpenBSD?

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Bugs item #549081, was opened at 2002-04-26 14:54
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Category: Installation
Group: Python 2.2.1 candidate
Status: Open
Resolution: None
Priority: 5
Submitted By: Noah Spurrier (noah)
Assigned to: Nobody/Anonymous (nobody)
Summary: test_signal hangs -- signal broken on OpenBSD?

Initial Comment:

This appears to be similar to bug as PR#288,
    [ 210635 ] test_signal hangs when running 
    as part of testall (PR#288)

except that I have this problem on a fresh install of
OpenBSD 3.0 while trying to build Python-2.2.1.
I did a generic build running as root:
    ./configure
    ./make
    ./make test

Yours,
Noah



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>Comment By: Michael Hudson (mwh)
Date: 2002-10-31 10:49

Message:
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As far as I am aware (not very) Python signals have always
been broken on OpenBSD.  None of the Python core developers
use OpenBSD, though, so it's always remained a mystery.

frallan, does the C equivalent of your Python test work?  Do
you have any idea what Python (or OpenBSD, maybe) is doing
wrong?

signals are pain.

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Comment By: Frallan the master Jedi (frallan)
Date: 2002-10-31 09:48

Message:
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I get the exact same behavior on OpenBSD 3.1 with Python-
2.2.2. Also this simple test program from the "Python 
Standard Library" book - fails. The program terminates but 
the "got signal" message is never printed.

import signal
import time

def handler (signo, frame):
    print 'got signal', signo

signal.signal(signal.SIGALRM, handler)
# wake me up in two seconds
signal.alarm(2)
now = time.time()
time.sleep(200)
print 'slept for', time.time() - now, "seconds"


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Comment By: Noah Spurrier (noah)
Date: 2002-04-27 16:40

Message:
Logged In: YES 
user_id=59261

Below is the output of test_signal.py. I ran it manually. I 
modified it slightly to print out the pid; the return 
values from the signal calls; and to print a count of the 
loop iteration (starting at 1). You can see that after 
Count 4 it just sits there. After about a minute I hit Ctrl-
Z. I have uploaded the modified version of test_signal.py.
...
bash-2.05# python test_signal.py 
pid: 8606
signal.alarm(20): 0
signal.signal(5, handlerA): 0
signal.signal(2, handlerB): <built-in function 
default_int_handler>
signal.signal(3, signal.SIG_IGN): 0
signal.signal(signal.SIGALRM, signal.default_int_handler): 0
starting pause() loop...
+ sleep 2
count: 1
call pause()...
+ kill -5 8606
pause() returned
+ sleep 2
count: 2
call pause()...
+ kill -2 8606
pause() returned
+ sleep 2
count: 3
call pause()...
+ kill -3 8606
pause() returned
count: 4
call pause()...
^Z
[1]+  Stopped                 python test_signal.py
bash-2.05# ps -p 8606
  PID TT   STAT      TIME COMMAND
 8606 p0  T       0:00.09 python test_signal.py 
bash-2.05# uname -a
OpenBSD nobot 3.0 GENERIC#94 i386
bash-2.05# python
Python 2.2.1 (#4, Apr 26 2002, 23:06:40) 
[GCC 2.95.3 20010125 (prerelease)] on openbsd3





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