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<title>curl_version_info man page</title>
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<p class="level0"><a name="NAME"></a><h2 class="nroffsh">NAME</h2>
<p class="level0">curl_version_info - returns run-time libcurl version info <a name="SYNOPSIS"></a><h2 class="nroffsh">SYNOPSIS</h2>
<p class="level0"><span Class="bold">#include &lt;curl/curl.h&gt;</span>
<p class="level0"><span Class="bold">curl_version_info_data *curl_version_info( CURLversion type );</span>
<p class="level0"><a name="DESCRIPTION"></a><h2 class="nroffsh">DESCRIPTION</h2>
<p class="level0">Returns a pointer to a filled in struct with information about various run-time features in libcurl. <span Class="emphasis">type</span> should be set to the version of this functionality by the time you write your program. This way, libcurl will always return a proper struct that your program understands, while programs in the future might get an different struct. CURLVERSION_NOW will be the most recent one for the library you have installed:
<p class="level0">&nbsp;       data = curl_version_info(CURLVERSION_NOW);
<p class="level0">Applications should use this information to judge if things are possible to do or not, instead of using compile-time checks, as dynamic/DLL libraries can be changed independent of applications.
<p class="level0">The curl_version_info_data struct looks like this
<p class="level0"><pre>
<p class="level0">typedef struct {
 &nbsp; CURLversion age;          /* see description below */
 <p class="level0">&nbsp; /* when 'age' is 0 or higher, the members below also exist: */
 &nbsp; const char *version;      /* human readable string */
 &nbsp; unsigned int version_num; /* numeric representation */
 &nbsp; const char *host;         /* human readable string */
 &nbsp; int features;             /* bitmask, see below */
 &nbsp; char *ssl_version;        /* human readable string */
 &nbsp; long ssl_version_num;     /* not used, always zero */
 &nbsp; const char *libz_version; /* human readable string */
 &nbsp; const char **protocols;   /* list of protocols */
 <p class="level0">&nbsp; /* when 'age' is 1 or higher, the members below also exist: */
 &nbsp; const char *ares;         /* human readable string */
 &nbsp; int ares_num;             /* number */
 <p class="level0">&nbsp; /* when 'age' is 2 or higher, the member below also exists: */
 &nbsp; const char *libidn;       /* human readable string */
 <p class="level0">} curl_version_info_data;
 <p class="level0"><span Class="emphasis">age</span> describes what age of this struct this is. The number depends on how
 new libcurl you're using. You are however guaranteed to get a struct that you
 have a matching struct for in the header, as you tell libcurl your "age" with
 the input argument.
 <p class="level0"><span Class="emphasis">version</span> is just an ascii string for the libcurl version.
 <p class="level0"><span Class="emphasis">version_num</span> is a 24 bit number created like this: &lt;8 bits major number&gt;
 | &lt;8 bits minor number&gt; | &lt;8 bits patch number&gt;. Version 7.9.8 is therefore
 returned as 0x070908.
 <p class="level0"><span Class="emphasis">host</span> is an ascii string showing what host information that this libcurl
 was built for. As discovered by a configure script or set by the build
 environment.
 <p class="level0"><span Class="emphasis">features</span> can have none, one or more bits set, and the currently defined
 bits are:
 <p class="level1"><p class="level0"><a name="CURLVERSIONIPV6"></a><span class="nroffip">CURL_VERSION_IPV6</span> <p class="level1">supports IPv6
 <p class="level0"><a name="CURLVERSIONKERBEROS4"></a><span class="nroffip">CURL_VERSION_KERBEROS4</span> <p class="level1">supports kerberos4 (when using FTP)
 <p class="level0"><a name="CURLVERSIONSSL"></a><span class="nroffip">CURL_VERSION_SSL</span> <p class="level1">supports SSL (HTTPS/FTPS) (Added in 7.10)
 <p class="level0"><a name="CURLVERSIONLIBZ"></a><span class="nroffip">CURL_VERSION_LIBZ</span> <p class="level1">supports HTTP deflate using libz (Added in 7.10)
 <p class="level0"><a name="CURLVERSIONNTLM"></a><span class="nroffip">CURL_VERSION_NTLM</span> <p class="level1">supports HTTP NTLM (added in 7.10.6)
 <p class="level0"><a name="CURLVERSIONGSSNEGOTIATE"></a><span class="nroffip">CURL_VERSION_GSSNEGOTIATE</span> <p class="level1">supports HTTP GSS-Negotiate (added in 7.10.6)
 <p class="level0"><a name="CURLVERSIONDEBUG"></a><span class="nroffip">CURL_VERSION_DEBUG</span> <p class="level1">libcurl was built with extra debug capabilities built-in. This is mainly of
 interest for libcurl hackers. (added in 7.10.6)
 <p class="level0"><a name="CURLVERSIONASYNCHDNS"></a><span class="nroffip">CURL_VERSION_ASYNCHDNS</span> <p class="level1">libcurl was built with support for asynchronous name lookups, which allows
 more exact timeouts (even on Windows) and less blocking when using the multi
 interface. (added in 7.10.7)
 <p class="level0"><a name="CURLVERSIONSPNEGO"></a><span class="nroffip">CURL_VERSION_SPNEGO</span> <p class="level1">libcurl was built with support for SPNEGO authentication (Simple and Protected
 GSS-API Negotiation Mechanism, defined in RFC 2478.) (added in 7.10.8)
 <p class="level0"><a name="CURLVERSIONLARGEFILE"></a><span class="nroffip">CURL_VERSION_LARGEFILE</span> <p class="level1">libcurl was built with support for large files. (Added in 7.11.1)
 <p class="level0"><a name="CURLVERSIONIDN"></a><span class="nroffip">CURL_VERSION_IDN</span> <p class="level1">libcurl was built with support for IDNA, domain names with international
 letters. (Added in 7.12.0)
 <p class="level0"><a name="CURLVERSIONSSPI"></a><span class="nroffip">CURL_VERSION_SSPI</span> <p class="level1">libcurl was built with support for SSPI. This is only available on Windows and
 makes libcurl use Windows-provided functions for NTLM authentication. It also
 allows libcurl to use the current user and the current user's password without
 the app having to pass them on. (Added in 7.13.2)
 <p class="level0"><span Class="emphasis">ssl_version</span> is an ascii string for the OpenSSL version used. If libcurl
 has no SSL support, this is NULL.
 <p class="level0"><span Class="emphasis">ssl_version_num</span> is the numerical OpenSSL version value as defined by the
 OpenSSL project. If libcurl has no SSL support, this is 0.
 <p class="level0"><span Class="emphasis">libz_version</span> is an ascii string (there is no numerical version). If
 libcurl has no libz support, this is NULL.
 <p class="level0"><span Class="emphasis">protocols</span> is a pointer to an array of char * pointers, containing the
 names protocols that libcurl supports (using lowercase letters). The protocol
 names are the same as would be used in URLs. The array is terminated by a NULL
 entry.
 </pre>
<a name="RETURN"></a><h2 class="nroffsh">RETURN VALUE</h2>
<p class="level0">A pointer to a curl_version_info_data struct. <a name="SEE"></a><h2 class="nroffsh">SEE ALSO</h2>
<p class="level0"><a class="emphasis" href="./curl_version.html">curl_version(3)</a>
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