[lttng-dev] Question about file descriptor of sockets and pipes

[Mathieu Desnoyers]

* Rui Han (r.han at umiami.edu) wrote:
> Hi All,
> 
> What does the number "6454" and "6455" in the following dump information
> stand for? Are they pipe number and socket number? How did they generated,
> I want to figure out what process is using it, where should I start? Thank
> you very much.
> 
> lttng_statedump_file_descriptor: { cpu_id = 0 }, { pid = 1, fd = 3,
> filename = "pipe:[6454]" }
> lttng_statedump_file_descriptor: { cpu_id = 0 }, { pid = 1, fd = 7,
> filename = "socket:[6455]" }

This is the file name assigned internally to the pipe and socket file
descriptors by the Linux kernel. You might want to compare this with the
output of "lsof". This might be the "NODE" value (to be confirmed).

Thanks,

Mathieu

> 
> Regards,
> Rui

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-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com