Michael Goerz
2/21/2008 5:36:00 PM
Hi,
I'm using subprocess.Popen() to run some background processes. However,
the program is also supposed to catch CTRL+C keyboard interrupts for
refreshs (i.e. a keyboard interrupt doesn't shut down the program).
But as it seems, a keyboard interrupt will automatically pass down to
the subprocesses, causing them to abort. Is there a way that I can
prevent the subprocesses from being canceled by a keyboard interrupt?
To clarify my question, here is a minimal example:
import subprocess
import os
import time
import sys
# is 'sleep' available on Win machines?
# use another dummy program if it isn't
p = subprocess.Popen(['sleep', '10'])
while True:
try:
time.sleep(1)
pass # normal program procedure
print "subprocess poll: " + str(p.poll())
except KeyboardInterrupt:
try:
print("Hit Ctrl+C again to quit")
time.sleep(1)
print "Refreshing"
pass # do some refresh stuff here
except KeyboardInterrupt:
sys.exit(0)
As you can see, after the refresh, p.poll() is '-2'. I'd want the
subprocess to continue undisturbed, i.e. p.poll() would still return 'None'.
Thanks,
Michael