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Kamil Kisiel
Asked: 2009-07-31 14:18:27 +0800 CST

How can I get more info on open pipes show in /proc in Linux?

  • 772

In Linux if you go digging in /proc/<pid>/fd often you'll see output like:

lrwx------ 1 root root 64 Jul 30 15:14 0 -> /dev/null
lrwx------ 1 root root 64 Jul 30 15:14 1 -> /dev/null
l-wx------ 1 root root 64 Jul 30 15:14 10 -> pipe:[90222668]
lr-x------ 1 root root 64 Jul 30 15:14 11 -> pipe:[90222669]
l-wx------ 1 root root 64 Jul 30 15:14 13 -> pipe:[90225058]
lr-x------ 1 root root 64 Jul 30 15:14 14 -> pipe:[90225059]

How do I get more info about the open pipes, such as which process is on the other end?

linux pipe

4 Answers

  1. Best Answer

    Similiar to other answers, but:

    lsof | grep 90222668

    Will show you both ends, because both ends share the 'pipe number'.

    • 56

  2. The only way to find what process is on the other end is by looping over all processes in /proc and seeing which are using that pipe (ie, which have symlinks in /proc/pid/fd to the same pipe ID)

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  3. The most information I know how to get on open pipes is

    lsof|grep FIFO

    Still only tells about one end of it, I'm afraid.

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  4. lsof +E | grep FIFO | grep 90222668
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