curl_version_info man page

## 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 an 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;     /* number */
       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 */
     } curl_version_info_data;
     age 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.
     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)
     CURL_VERSION_LIBZ supports HTTP deflate using libz
     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 extra debug capabilities built-in. This is mainly of
     interest for libcurl hackers. (added in 7.10.6)
     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.
     CURL_VERSION_IDN libcurl was built with support for IDNA, domain names with international
     letters.
     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)

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