curl-7.25.0/docs/libcurl/curl_easy_send.html

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<p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
<p class="level0">curl_easy_send - sends raw data over an "easy" connection <a name="SYNOPSIS"></a><h2 class="nroffsh">SYNOPSIS</h2>
<p class="level0"><span Class="bold">#include &lt;curl/easy.h&gt;</span> 
<p class="level0"><span Class="bold">CURLcode curl_easy_send( CURL * curl , const void * buffer ,</span> <span Class="bold"> size_t  buflen , size_t * n );</span> 
<p class="level0"><a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
<p class="level0">This function sends arbitrary data over the established connection. You may use it together with <a class="emphasis" href="./curl_easy_recv.html">curl_easy_recv(3)</a> 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. 
<p class="level0"><span Class="bold">buffer</span> is a pointer to the data of length <span Class="bold">buflen</span> that you want sent. The variable <span Class="bold">n</span> points to will receive the number of sent bytes. 
<p class="level0">To establish the connection, set <span Class="bold">CURLOPT_CONNECT_ONLY</span> option before calling <a class="emphasis" href="./curl_easy_perform.html">curl_easy_perform(3)</a>. Note that <a class="emphasis" href="./curl_easy_send.html">curl_easy_send(3)</a> will not work on connections that were created without this option. 
<p class="level0">You must ensure that the socket is writable before calling <a class="emphasis" href="./curl_easy_send.html">curl_easy_send(3)</a>, otherwise the call will return <span Class="bold">CURLE_AGAIN</span> - the socket is used in non-blocking mode internally. Use <a class="emphasis" href="./curl_easy_getinfo.html">curl_easy_getinfo(3)</a> with <span Class="bold">CURLINFO_LASTSOCKET</span> to obtain the socket; use your operating system facilities like <span Class="emphasis">select(2)</span> to check if it can be written to. <a name="AVAILABILITY"></a><h2 class="nroffsh">AVAILABILITY</h2>
<p class="level0">Added in 7.18.2. <a name="RETURN"></a><h2 class="nroffsh">RETURN VALUE</h2>
<p class="level0">On success, returns <span Class="bold">CURLE_OK</span> and stores the number of bytes actually sent into <span Class="bold">*n</span>. Note that this may very well be less than the amount you wanted to send. 
<p class="level0">On failure, returns the appropriate error code. <a name="EXAMPLE"></a><h2 class="nroffsh">EXAMPLE</h2>
<p class="level0">See <span Class="bold">sendrecv.c</span> in <span Class="bold">docs/examples</span> directory for usage example. <a name="SEE"></a><h2 class="nroffsh">SEE ALSO</h2>
<p class="level0"><a class="manpage" href="./curl_easy_setopt.html">curl_easy_setopt (3)</a> <a class="manpage" href="./curl_easy_perform.html">  curl_easy_perform (3)</a> <a class="manpage" href="./curl_easy_getinfo.html">  curl_easy_getinfo (3)</a> <span Class="manpage"> </span> <a class="manpage" href="./curl_easy_recv.html">curl_easy_recv (3) </a> <p class="roffit">
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