[Nottingham] Unix process open sockets

[Charles Samuels]

Roger Light wrote, on Thursday 2008 January 03:
> Hi Phil,
>
> >    Is there a way using perl that, given a process Id ($pid) I can
> >    retrieve/display all the
> >    associated sockets (unix/internet) of the corresponding unix process ?
>
> The answer has to be "yes", but I'm not sure how to do it natively. I
> suspect you might have to resort to looking in /proc/$pid but I don't
> know what for... :)

Hi there,

both netstat and lsof are implemented in terms of /proc/$pid - there's really 
no other way to do it.

You map the contents of each of the symlinks in /proc/$pid/fd/ to a file 
in /proc/net/... - it's not exactly easy

> Both netstat (with "netstat -ap") and lsof can retrieve this
> information, so you could always either look at how they do it or parse
> their output.

I think parsing their output is the way to go.

Good luck, and tell us how you decided to do it and what it's for!

charles
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