Sorry for the late reply,
But is it necessary to use a child process? I don't want to execute the
command in another process. What happens with the parent process and how
do I execute my command in the parent process?
Thanks
Hugo González Monteverde wrote:
> Hi,
>
> os.system will return the errorval of the application. You need to
>
> 1) get the pid of the child process
> 2) kill it using os.kill(os.SIGTERM)
> 3) reap the killed process
>
> This is all in unix/linux, of course.
>
> what I do (untested, please check order of args and correct usage of
> exec):
>
> pid = os.fork()
>
> if pid == 0: #child process
> os.execvp("tcpdump", "tcpdump", "-n", "-i", "eth0")
>
> else: #parent
> time.sleep(5)
> os.kill(pid, os.SIGTERM)
> os.waitpid(pid, 0) #wait for process to end
>
>
>
> Johan Geldenhuys wrote:
>
>> I have script that calls a system command that I want to run for 5
>> minutes.
>> """
>> import os
>> cmd = 'tcpdump -n -i eth0'
>> os.system(cmd)
>> """
>>
>> I can start a timer after the cmd is issued, but I don't know how to
>> send a control signal to stop the command after I issued it. This is
>> normally from the shell ^c.
>>
>> This cmd my run in more than one thread on different interfaces and I
>> don't whant all of then stopped at once. I think the best way is to
>> make a thread for each interface where the cmd can be issued and
>> stopped without the danger of stopping he wrong thread.
>>
>> Can anybody help?
>>
>> Thanks
>>
>> Johan
>> _______________________________________________
>> Tutor maillist - [email protected]
>> http://mail.python.org/mailman/listinfo/tutor
>>
>
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