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dnscache: own source file, improvements

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- Rename `Curl_resolv_unlink()` to `Curl_dns_entry_unlink()`.
- Change `Curl_dnscache_get()` to return CURLcode result. Returns
  now `CURLE_COULDNT_RESOLVE_HOST` for "negative" cache entries.
- Add `Curl_dnscache_add_negative()` to put a "negative" entry
  into the cache.

Closes #20864
This commit is contained in:
Stefan Eissing 2026-03-06 09:22:26 +01:00 • committed by Daniel Stenberg
parent b0f6e9a3d7
commit 96d5b5c688
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35 changed files with 1648 additions and 1413 deletions
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lib/urldata.h
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@ -719,7 +719,8 @@ struct UrlState {
struct Curl_dns_entry *dns[2]; /* DNS to connect FIRST/SECONDARY */
#ifdef USE_CURL_ASYNC
struct Curl_async async; /* asynchronous name resolver data */
struct Curl_resolv_async *async; /* asynchronous name resolver data */
uint32_t next_async_id; /* id of the next async resolve operation */
#endif
#ifdef USE_OPENSSL