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CURLMOPT_SOCKETFUNCTION.md: add advice for socket callback invocation times

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Explain when a registered socket callback may get invoked to make user
better aware on how to handle it.

Closes #16441
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Stefan Eissing 2025-02-23 10:05:41 +01:00 • committed by Daniel Stenberg
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docs/libcurl/opts/CURLMOPT_SOCKETFUNCTION.md
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@ -47,6 +47,11 @@ libcurl then expects the application to monitor the sockets for the specific
activities and tell libcurl again when something happens on one of them. Tell
libcurl by calling curl_multi_socket_action(3).
This callback may get invoked at any time when interacting with libcurl.
This may even happen after all transfers are done and is *likely* to
happen *during* a call to curl_multi_cleanup(3) when cached connections
are shut down.
# CALLBACK ARGUMENTS
*easy* identifies the specific transfer for which this update is related.