<p class="level0">CURLE_OK (zero) means that the option was set properly, and a non-zero return code means something wrong occurred after the new state was set. See the <a Class="emphasis" href="./libcurl-errors.html">libcurl-errors</a> man page for the full list with descriptions. <a name="LIMITATIONS"></a><h2 class="nroffsh">LIMITATIONS</h2>
<p class="level0">The pausing of transfers does not work with protocols that work without network connectivity, like FILE://. Trying to pause such a transfer, in any direction, will cause problems in the worst case or an error in the best case. <a name="AVAILABILITY"></a><h2 class="nroffsh">AVAILABILITY</h2>
<p class="level0">This function was added in libcurl 7.18.0. Before this version, there was no explicit support for pausing transfers. <a name="USAGE"></a><h2 class="nroffsh">USAGE WITH THE MULTI-SOCKET INTERFACE</h2>
-<p class="level0">Before libcurl 7.32.0, when a specific handle was unpaused with this function, there was no particular forced rechecking or similar of the socket's state, which made the continuation of the transfer get delayed until next multi-socket call invoke or even longer. Alternatively, the user could forcibly call for example curl_multi_socket_all(3) - with a rather hefty performance penalty.
+<p class="level0">Before libcurl 7.32.0, when a specific handle was unpaused with this function, there was no particular forced rechecking or similar of the socket's state, which made the continuation of the transfer get delayed until next multi-socket call invoke or even longer. Alternatively, the user could forcibly call for example <a Class="emphasis" href="./curl_multi_socket_all.html">curl_multi_socket_all</a> - with a rather hefty performance penalty.
<p class="level0">Starting in libcurl 7.32.0, unpausing a transfer will schedule a timeout trigger for that handle 1 millisecond into the future, so that a curl_multi_socket_action( ... CURL_SOCKET_TIMEOUT) can be used immediately afterwards to get the transfer going again as desired. <a name="MEMORY"></a><h2 class="nroffsh">MEMORY USE</h2>
<p class="level0">When pausing a read by returning the magic return code from a write callback, the read data is already in libcurl's internal buffers so it'll have to keep it in an allocated buffer until the reading is again unpaused using this function.
<p class="level0">If the downloaded data is compressed and is asked to get uncompressed automatically on download, libcurl will continue to uncompress the entire downloaded chunk and it will cache the data uncompressed. This has the side- effect that if you download something that is compressed a lot, it can result in a very large data amount needing to be allocated to save the data during the pause. This said, you should probably consider not using paused reading if you allow libcurl to uncompress data automatically. <a name="SEE"></a><h2 class="nroffsh">SEE ALSO</h2>
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