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CURLMOPT_SOCKETFUNCTION.md: expand on the easy argument
Since recent changes makes it more likely to be an internal handle that shows up and some users have been surprised by this. Ref: #14792 Closes #14795
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@ -50,6 +50,9 @@ libcurl by calling curl_multi_socket_action(3).
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# CALLBACK ARGUMENTS
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*easy* identifies the specific transfer for which this update is related.
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Since this callback manages a whole multi handle, an application should not
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make assumptions about which particular handle that is passed here. It might
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even be an internal easy handle that the application did not add itself.
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*s* is the specific socket this function invocation concerns. If the
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**what** argument is not CURL_POLL_REMOVE then it holds information about
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