Date: Mon, 3 Jun 2013 23:39:31 -0400 From: staticsafe <me@staticsafe.ca> To: freebsd-questions@freebsd.org Subject: Re: System Calls that do DNS Message-ID: <20130604033930.GA10393@uriel.asininetech.com> In-Reply-To: <F5EBDC53-CBA3-415D-B7CD-1EC873692348@lafn.org> References: <F5EBDC53-CBA3-415D-B7CD-1EC873692348@lafn.org>
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On Mon, Jun 03, 2013 at 07:57:07PM -0700, Doug Hardie wrote: > I have an unusual situation. A program is doing a DNS lookup and often the IP address has no reverse DNS entries. As a result the program hangs for several timeouts. The call is not being made directly in its code, but is occurring in a system call. There are no specific calls to DNS, its something else doing it. I have been trying to track down which system call is doing it, but without success so far. I have tried syslog calls around each of the system calls I thought might be the culprit, but my guessing is not very good. How can I identify the system call that is calling DNS? If I can find it, I hopefully can find another way to do whatever it does that does not involve a reverse DNS lookup. > > Use truss: http://www.freebsd.org/cgi/man.cgi?query=truss The truss utility traces the system calls called by the specified process or program. -- staticsafe O< ascii ribbon campaign - stop html mail - www.asciiribbon.org Please don't top post - http://goo.gl/YrmAb Don't CC me! I'm subscribed to whatever list I just posted on.
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