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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; /* 0 - this kind of struct */
&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; /* number */
&nbsp; char *libz_version; /* human readable string */
&nbsp; const char *protocols[]; /* list of protocols */
} curl_version_info_data;
<p class="level0"><span Class="emphasis">age</span> describes what kind of struct this is. It is always 0 now. In a
future libcurl, if this struct changes, this age counter may be increased, and
then the struct for number 1 will look different (except for this first struct
field).
<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="level0"><span Class="bold">CURL_VERSION_IPV6</span>
supports IPv6
<p class="level0"><span Class="bold">CURL_VERSION_KERBEROS4</span>
supports kerberos4 (when using FTP)
<p class="level0"><span Class="bold">CURL_VERSION_SSL</span>
supports SSL (HTTPS/FTPS)
<p class="level0"><span Class="bold">CURL_VERSION_LIBZ</span>
supports HTTP deflate using libz
<p class="level0"><span Class="bold">CURL_VERSION_NTLM</span>
supports HTTP NTLM (added in 7.10.6)
<p class="level0"><span Class="bold">CURL_VERSION_GSSNEGOTIATE</span>
supports HTTP GSS-Negotiate (added in 7.10.6)
<p class="level0"><span Class="bold">CURL_VERSION_DEBUG</span>
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"><span Class="bold">CURL_VERSION_ASYNCHDNS</span>
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"><span Class="bold">CURL_VERSION_SPNEGO</span>
libcurl was built with support for SPNEGO authentication (Simple and Protected
GSS-API Negotiation Mechanism, defined in RFC 2478.) (added in 7.10.8)
<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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