Hi all,
I have a console application, using raw_input() (readline) for interface
and SIGALRM for periodic work. Now I added some GUI with PyGTK and all
was fine until I found out that alarm signals stop to arise. The cause
is, to my regret, just 'import gtk'. Here is the code to reproduce:
import signal
import readline # turn on readline
def catcher(signum, _ignored_):
print "beat!"
if __name__ == "__main__":
import gtk # <- causes alarm signals not to be delivered
signal.signal(signal.SIGALRM, catcher)
signal.setitimer(signal.ITIMER_REAL, 3, 3)
raw_input() # to expect "beat!" printing until pressing Enter
On the one hand, I need raw_input() to use all goodies that readline
has; on the other hand, using (classic, Unix) signals is the only way to
bypass the blocking of raw_input(). I tried to find the reason of
signals-pygtk conflict for 2 days, but no much results; any help is
appreciate. I am using Ubuntu Karmic, Python 2.6.
As I see from Python sources, blocking behaviour of raw_input() is done
via custom select(), see Modules/readline.c,
readline_until_enter_or_signal(); and when signal SIGALRM is arisen,
select() is interrupted with errno == EINTR which causes my function
catcher() to be invoked (via PyErr_CheckSignals()). But when I 'import
gtk', EINTR stops to arise, how can it happen?
Thanks in advance,
Ilya Murav'jov
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