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 hav-
ing to pass them on. (Added in 7.13.2)
CURL_VERSION_CONV
libcurl was built with support for character conversions, as provided by the CURLOPT_CONV_* callbacks. (Added in 7.15.4)
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)