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Accepted
ericslaw
Asked: 2010-03-18 11:54:19 +0800 CST

lsof not showing what port a proc is listening on

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I have many processes on a box listening on several ports.
I am trying to map ports to pids.
The problem is that lsof is not telling me what ports belong to which process.

Given an apache listening on port 80, I can see it listening via netstat:
user@host% netstat -an|grep LISTEN|grep 80
*.80 *.* 0 0 49152 0 LISTEN

But when I try to map port 80 to a pid I get nothing:
user@host% lsof -iTCP:80 -t

When I try seeing what sockets that specific pid is using I get:
user@host% lsof -lnP -p31 -a -i
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
libhttpd. 31 0 15u IPv4 0x6002d970b80 0t0 TCP *:65535 (LISTEN)

Notice the *:65535 in the NAME column.

Does anyone know why lsof is not reporting the port in use?

I am running as root. I am using a mix of lsof and os versions:
lsof v4.77 on Solaris10 sparc
lsof v4.72 on Redhat4.2
etc

I know that linux solutions can use "netstat -p",
so I guess I'm only looking for why solaris isn't working, but I find lsof is frequently silent and not showing me expected data.

solaris unix netstat lsof

1 Answers

  1. Best Answer

    You'd rather use pfiles which is part of Solaris and supported by Sun, unlike lsof.

    Its usage is slightly different as it expects a pid as argument but you can achieve what you want with something like:

    pfiles $(pgrep libhttpd)

    or even, if you don't know the process name:

    pfiles /proc/*
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