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 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; /* 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 */
} 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
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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 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 authen-
tication (Simple and Protected GSS-API Negotiation
Mechanism, defined in RFC 2478.) (added in 7.10.8)
CURL_VERSION_LARGEFILE
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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 authentica-
tion. 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)
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 sup-
port, this is 0.
libz_version is an ascii string (there is no numerical ver-
sion). If libcurl has no libz support, this is NULL.
protocols is a pointer to an array of char * pointers, con-
taining 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 ALSOcurl_version(3)libcurl 7.13.2 Last change: 11 Mar 2005 3
