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url: Add option CURLOPT_RESOLVER_START_FUNCTION

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- Add new option CURLOPT_RESOLVER_START_FUNCTION to set a callback that
  will be called every time before a new resolve request is started
  (ie before a host is resolved) with a pointer to backend-specific
  resolver data. Currently this is only useful for ares.

- Add new option CURLOPT_RESOLVER_START_DATA to set a user pointer to
  pass to the resolver start callback.

Closes https://github.com/curl/curl/pull/2311
This commit is contained in:
Francisco Sedano 2018-02-14 17:20:43 +00:00 • committed by Jay Satiro
parent dd027c80fe
commit 23713645d4
16 changed files with 379 additions and 3 deletions
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4
docs/libcurl/curl_easy_setopt.3
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@ -139,6 +139,10 @@ Callback for wildcard matching. See \fICURLOPT_FNMATCH_FUNCTION(3)\fP
Data pointer to pass to the wildcard matching callback. See \fICURLOPT_FNMATCH_DATA(3)\fP
.IP CURLOPT_SUPPRESS_CONNECT_HEADERS
Suppress proxy CONNECT response headers from user callbacks. See \fICURLOPT_SUPPRESS_CONNECT_HEADERS(3)\fP
.IP CURLOPT_RESOLVER_START_FUNCTION
Callback to be called before a new resolve request is started. See \fICURLOPT_RESOLVER_START_FUNCTION(3)\fP
.IP CURLOPT_RESOLVER_START_DATA
Data pointer to pass to resolver start callback. See \fICURLOPT_RESOLVER_START_DATA(3)\fP
.SH ERROR OPTIONS
.IP CURLOPT_ERRORBUFFER
Error message buffer. See \fICURLOPT_ERRORBUFFER(3)\fP