Python, how to read from stdout of ongoing process like tcpdump over Ubuntu

Asked Aug 05 '13 at 08:14

Active Aug 05 '13 at 08:14

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I am trying to read from tcpdump output using python. I am using subprocess to read from tcpdump stdout on fedora, redhat, SUSE, but actually my script doesn't work on Ubuntu. my question sounds like this questionhttp://stackoverflow.com/questions/7163877/getting-stdout-from-a-tcpdump-subprocess-after-terminating-it, but actually, I don't find a proper solution.. This is my python code:

tcp_cmd = "tcpdump -i eth2 dst 224.1.1.1"

tcp_handle = Popen(tcp_cmd,shell=True,stdout=PIPE, stderr=PIPE)

tcp_handle.terminate()

result = tcp_handle.stdout.read()`enter code here`

print result

edited Aug 05 '13 at 08:14

falsetru

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asked Aug 05 '13 at 08:14

always read() blocks on ubuntu I know reading from a process after killing it is not valid, but I didnt find another way – Aug 05 '13 at 08:46
Is it only not working on Ubuntu or not working generally? – Mikko Ohtamaa Aug 05 '13 at 09:45
You kill the process right after you started it. Maybe the process didn't have enough time to print anything yet? – Armin Rigo Aug 05 '13 at 14:28

Python, how to read from stdout of ongoing process like tcpdump over Ubuntu

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