Hi,

you cannot change existing DNS entries after they have been added, because the entries are possibly shared between multiple threads, and only the access to the cache itself (and the ->inuse counter) is synchronized.

Best regards,
Stefan Bühler

Von: curl-library [mailto:curl-library-bounces_at_cool.haxx.se] Im Auftrag von Ray Satiro via curl-library
Gesendet: Sonntag, 8. März 2015 22:35
An: Libcurl Development
Betreff: Re: Fixing CURLOPT_RESOLVE

On 3/2/2015 2:28 AM, Ray Satiro wrote:

I've started some work on fixing CURLOPT_RESOLVE. I have fixed it so that multiple addresses can be stored for each host:port. You can see a branch comparison at [1]. I'm exploring the removal of cache entries now. Currently it is documented that an entry can be removed by -host:port but it is not implemented [2][3]. I can't see an easy way to do it. If a Curl_dns_entry has an inuse count and that count is 1 it seems to me there's really no way to tell if that's because it's a user initiated entry (ie CURLOPT_RESOLVE incremented inuse so the cache entry is always in use) or because it's actually in use.

[...]

[1]: https://github.com/bagder/curl/compare/master...jay:fix-curlopt_resolve?expand=1
[2]: http://curl.haxx.se/libcurl/c/CURLOPT_RESOLVE.html
[3]: https://github.com/bagder/curl/blob/17abfd5/lib/hostip.c#L800-L802

I didn't get any feedback on this so I just went ahead and wrote it in the way I think is most correct. https://github.com/jay/curl/commit/1ae8b1f

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Received on 2015-03-17