curl_version_info(3) libcurl Manual curl_version_info(3)NAMEcurl_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
features in the running version of 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 possi‐
ble 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 capabili‐
ties. 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 Win‐
dows) 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-pro‐
vided 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 CURLOPT_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)
CURL_VERSION_HTTP2
libcurl was built with support for HTTP2. (Added in
7.33.0)
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 ter‐
minated by a NULL entry.
RETURN VALUE
A pointer to a curl_version_info_data struct.
SEE ALSOcurl_version(3)libcurl 7.33.0 18 Feb 2014 curl_version_info(3)
