cURL libcurl API curl_easy_recv
curl_easy_recv.3 -- man page
CURLcode curl_easy_recv( CURL * curl , void * buffer , size_t buflen , size_t * n );
This function receives raw data from the established connection. You may use it together with curl_easy_send to implement custom protocols using libcurl. This functionality can be particularly useful if you use proxies and/or SSL encryption: libcurl will take care of proxy negotiation and connection set-up.
buffer is a pointer to your buffer that will get the received data. buflen is the maximum amount of data you can get in that buffer. The variable n points to will receive the number of received bytes.
To establish the connection, set CURLOPT_CONNECT_ONLY option before calling curl_easy_perform or cIcurl_multi_perform(3). Note that curl_easy_recv does not work on connections that were created without this option.
You must ensure that the socket has data to read before calling curl_easy_recv, otherwise the call will return CURLE_AGAIN - the socket is used in non-blocking mode internally. Use curl_easy_getinfo with CURLINFO_LASTSOCKET to obtain the socket; use your operating system facilities like select(2) to check if it has any data you can read.
On success, returns CURLE_OK, stores the received data into buffer, and the number of bytes it actually read into *n.
On failure, returns the appropriate error code.
If there is no data to read, the function returns CURLE_AGAIN. Use your operating system facilities to wait until the data is ready, and retry.
Reading exactly 0 bytes would indicate a closed connection.
If there's no socket available to use from the previous transfer, this function returns CURLE_UNSUPPORTED_PROTOCOL.
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