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curl_version_info(3)                           libcurl Manual                           curl_version_info(3)



NAME
       curl_version_info - returns run-time libcurl version info

SYNOPSIS
       #include <curl/curl.h>

       curl_version_info_data *curl_version_info( CURLversion type);

DESCRIPTION
       Returns  a pointer to a filled in struct with information about various run-time features in libcurl.
       type 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 a different struct. CURLVERSION_NOW will be the most recent one for the library  you
       have installed:

               data = curl_version_info(CURLVERSION_NOW);

       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.

       The curl_version_info_data struct looks like this

       typedef struct {
         CURLversion age;          /* see description below */

         /* when 'age' is 0 or higher, the members below also exist: */
         const char *version;      /* human readable string */
         unsigned int version_num; /* numeric representation */
         const char *host;         /* human readable string */
         int features;             /* bitmask, see below */
         char *ssl_version;        /* human readable string */
         long ssl_version_num;     /* not used, always zero */
         const char *libz_version; /* human readable string */
         const char **protocols;   /* list of protocols */

         /* when 'age' is 1 or higher, the members below also exist: */
         const char *ares;         /* human readable string */
         int ares_num;             /* number */

         /* when 'age' is 2 or higher, the member below also exists: */
         const char *libidn;       /* human readable string */

         /* when 'age' is 3 or higher, the members below also exist: */
         int iconv_ver_num;       /* '_libiconv_version' if iconv support enabled */

         const char *libssh_version; /* human readable string */

       } curl_version_info_data;

       age describes what the age of this struct is. The number depends on how new the libcurl you're  using
       is.  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.

       version is just an ascii string for the libcurl version.

       version_num is a 24 bit number created like this: <8 bits major number> | <8 bits minor number> |  <8
       bits patch number>. Version 7.9.8 is therefore returned as 0x070908.

       host  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.

       features can have none, one or more bits set, and the currently defined bits are:

              CURL_VERSION_IPV6
                     supports IPv6

              CURL_VERSION_KERBEROS4
                     supports kerberos4 (when using FTP)

              CURL_VERSION_SSL
                     supports SSL (HTTPS/FTPS) (Added in 7.10)

              CURL_VERSION_LIBZ
                     supports HTTP deflate using libz (Added in 7.10)

              CURL_VERSION_NTLM
                     supports HTTP NTLM (added in 7.10.6)

              CURL_VERSION_GSSNEGOTIATE
                     supports HTTP GSS-Negotiate (added in 7.10.6)

              CURL_VERSION_DEBUG
                     libcurl was built with debug capabilities (added in 7.10.6)

              CURL_VERSION_CURLDEBUG
                     libcurl was built with memory tracking debug capabilities. This is mainly  of  interest
                     for libcurl hackers. (added in 7.19.6)

              CURL_VERSION_ASYNCHDNS
                     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)

              CURL_VERSION_SPNEGO
                     libcurl  was built with support for SPNEGO authentication (Simple and Protected GSS-API
                     Negotiation Mechanism, defined in RFC 2478.) (added in 7.10.8)

              CURL_VERSION_LARGEFILE
                     libcurl was built with support for large files. (Added in 7.11.1)

              CURL_VERSION_IDN
                     libcurl was built with support for  IDNA,  domain  names  with  international  letters.
                     (Added in 7.12.0)

              CURL_VERSION_SSPI
                     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)

              CURL_VERSION_CONV
                     libcurl was built with support for character  conversions,  as  provided  by  the  CUR-LOPT_CONV_* CURLOPT_CONV_*
                     LOPT_CONV_* callbacks. (Added in 7.15.4)

              CURL_VERSION_TLSAUTH_SRP
                     libcurl was built with support for TLS-SRP. (Added in 7.21.4)

              CURL_VERSION_NTLM_WB
                     libcurl  was  built  with  support  for NTLM delegation to a winbind helper.  (Added in
                     7.22.0)
       ssl_version is an ASCII string for the OpenSSL version used. If libcurl has no SSL support,  this  is
       NULL.

       ssl_version_num  is the numerical OpenSSL version value as defined by the OpenSSL project. If libcurl
       has no SSL support, this is 0.

       libz_version is an ASCII string (there is no numerical version). If libcurl has no libz support, this
       is NULL.

       protocols  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.

RETURN VALUE
       A pointer to a curl_version_info_data struct.

SEE ALSO
       curl_version(3)




libcurl 7.19.6                                  10 June 2009                            curl_version_info(3)