Hi all!
I'm launching a subprocess using the following code, and I'd like to
kill off all associated subprocesses after a given timeout:
myproc = popen2.Popen3(command)
Now, because the command is executed in the shell, I end up with the
following process tree:
PID PPID PGID WINPID TTY UID STIME COMMAND
2332 3156 2332 3412 con 1012 15:34:11
/usr/bin/python2.4
3068 2332 2332 2268 con 1012 15:34:11 /usr/bin/sh
1584 3068 2332 2620 con 1012 15:34:12
/cygdrive/c/GNATPRO/5.01
a/bin/powerpc-elf-gdb
Here are the two options I've come up with:
1) I can kill 3068 using os.kill(myproc.pid, signal.SIGKILL), but that
keeps 1584 running and therefore doesn't do the trick.
2) I can kill the group of processes (2332) using
os.killpg(os.getpgid(myproc.id), signal.SIGKILL), but that terminates
Python as well, and I'd rather continue on my merry way in Python...
Here's my code:
myproc = popen2.Popen3(command)
second_count = 0
while myproc.poll() == -1:
time.sleep(1) # wait a sec
second_count = second_count + 1
if second_count == 30:
##use commented code to kill group
##pgid = os.getpgid(myproc.pid)
##os.killpg(pgid, signal.SIGKILL)
os.kill(myproc.pid, signal.SIGKILL)
One solution I've considered is using the Popen class to launch the
subprocess with shell=False. This would eliminate the shell process so
I'd only have one process to kill.... but I've got some I/O redirection
in my command string that I'd like to pass along to the shell. I think
I need the shell there for other reasons as well. Any idea how I can
know if a given process has children and find out what their PIDs are?
Any suggestions are greatly appreciated!
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