linux-kernel - RE: Seeing TCP socket options (nodelay, cork, etc) in Linux procfs or elsewhere?

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Message-ID: <5608FA8A997F1A46B7E985494F8478DD07930AFA@ELON17P32003A.csfb.cs-group.com>
Date:	Tue, 16 Mar 2010 18:24:58 -0000
From:	"MacCana, Mike" <mike.maccana@...dit-suisse.com>
To:	<linux-kernel@...r.kernel.org>
Subject: RE: Seeing TCP socket options (nodelay, cork, etc) in Linux procfs or elsewhere?

-----Original Message-----
From: Eric Dumazet [mailto:eric.dumazet@...il.com]
Sent: 15 March 2010 16:21
To: MacCana, Mike
Cc: linux-kernel@...r.kernel.org
Subject: Re: Seeing TCP socket options (nodelay, cork, etc) in Linux procfs or elsewhere?

>>Le lundi 15 mars 2010 à 15:49 +0000, MacCana, Mike a écrit :
>>> Hi kernel folks,
>>>  
>>> I was wondering if there was a standard location to see TCP socket 
>>> options (eg, nodelay, cork, etc), perhaps via procfs or some other 
>>> means? I'd like to check whether arbitrary apps (for which I don't 
>>> have
>>> code) are using particular TCP options. 

> the SystemTap Networking Tapset provides a tcp.setsockopt breakpoint which I can use.
> Mike

Here's the tap I used (included for anyone reading on a list archive if there's still no /proc implementation):

sockettest.stap
# Show sockets setting options
probe begin
{
	print ("\nChecking for apps making socket calls\n")
}
probe tcp.setsockopt
{
	printf ("  App '%s' (PID %d) set socket with args %s \n", execname(), pid(), optstr)
}

Mike

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