System Calls that do DNS
me at staticsafe.ca
Tue Jun 4 03:39:41 UTC 2013
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.
The truss utility traces the system calls called by the specified
process or program.
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