curl_easy_send(3)						  libcurl Manual						 curl_easy_send(3)

NAME

       curl_easy_send - sends raw data over an "easy" connection

SYNOPSIS

       #include <curl/easy.h>

       CURLcode curl_easy_send( CURL *curl, const void *buffer,  size_t buflen, size_t *n);

DESCRIPTION

       This function sends arbitrary data over the established connection. You may use it together with curl_easy_recv(3) to implement custom pro-
       tocols 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 the data of length buflen that you want sent.  The variable n points to will receive the number of sent bytes.

       To  establish  the  connection,	set CURLOPT_CONNECT_ONLY(3) option before calling curl_easy_perform(3) or curl_multi_perform(3). Note that
       curl_easy_send(3) will not work on connections that were created without this option.

       The call will return CURLE_AGAIN if it's not possible to send data right now - the socket is used in  non-blocking  mode  internally.  When
       CURLE_AGAIN  is	returned,  use	your  operating  system  facilities like select(2) to wait until the socket is writable. The socket may be
       obtained using curl_easy_getinfo(3) with CURLINFO_ACTIVESOCKET(3).

       Furthermore if you wait on the socket and it tells you it's writable, curl_easy_send(3) may return CURLE_AGAIN if the only  data  that  was
       sent was for internal SSL processing, and no other data could be sent.

AVAILABILITY

       Added in 7.18.2.

RETURN VALUE

       On success, returns CURLE_OK and stores the number of bytes actually sent into *n. Note that this may very well be less than the amount you
       wanted to send.

       On failure, returns the appropriate error code.

       This function may return CURLE_AGAIN. In this case, use your operating system facilities to wait until the socket is writable, and retry.

       If there's no socket available to use from the previous transfer, this function returns CURLE_UNSUPPORTED_PROTOCOL.

EXAMPLE

       See sendrecv.c in docs/examples directory for usage example.

SEE ALSO

       curl_easy_setopt(3), curl_easy_perform(3), curl_easy_getinfo(3), curl_easy_recv(3)

libcurl 7.54.0							 December 18, 2016						 curl_easy_send(3)