On Sep 16, 2013, at 7:20 AM, Anders Broman <anders.bro...@ericsson.com> wrote:
> In serv_name_lookup() we call getservbyport() for ports not resolved in the
> IANA port list the function
> Seems quite expensive so my question is does it add any value or can I remove
> it?
At least on UN*Xes, getservbyport() does one or more of:
1) look in /etc/services, which is probably based on a
(possibly-out-of-date) version of, err, umm, the IANA port list;
2) query some network service to do a lookup - and that service is
probably using its own database, based on a (possibly-out-of-date) version of,
err, umm, the IANA port list.
On Windows, I don't know what it ends up doing, but I wouldn't be surprised if
it were to look in a file that's based on a (possibly-out-of-date) version of,
err, umm, the IANA port list.
So I strongly doubt getservbyport() adds any value if we have our own IANA port
list file. (We probably didn't always have our own file, and started using
getservbyport() back when we didn't.)
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