1curl_version_info(3) libcurl Manual curl_version_info(3)
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6 curl_version_info - returns run-time libcurl version info
7
9 #include <curl/curl.h>
10 curl_version_info_data *curl_version_info( CURLversion type);
12
14 Returns a pointer to a filled in struct with information about various
15 run-time features in libcurl. type should be set to the version of this
16 functionality by the time you write your program. This way, libcurl
17 will always return a proper struct that your program understands, while
18 programs in the future might get an different struct. CURLVERSION_NOW
19 will be the most recent one for the library you have installed:
20 data = curl_version_info(CURLVERSION_NOW);
22 Applications should use this information to judge if things are possi‐
24 ble to do or not, instead of using compile-time checks, as dynamic/DLL
25 libraries can be changed independent of applications.
26 The curl_version_info_data struct looks like this
28 typedef struct {
30 CURLversion age; /* see description below */
31 /* when 'age' is 0 or higher, the members below also exist: */
33 const char *version; /* human readable string */
34 unsigned int version_num; /* numeric representation */
35 const char *host; /* human readable string */
36 int features; /* bitmask, see below */
37 char *ssl_version; /* human readable string */
38 long ssl_version_num; /* not used, always zero */
39 const char *libz_version; /* human readable string */
40 const char **protocols; /* list of protocols */
41 /* when 'age' is 1 or higher, the members below also exist: */
43 const char *ares; /* human readable string */
44 int ares_num; /* number */
45 /* when 'age' is 2 or higher, the member below also exists: */
47 const char *libidn; /* human readable string */
48 /* when 'age' is 3 or higher, the members below also exist: */
50 int iconv_ver_num; /* '_libiconv_version' if iconv support enabled */
51 const char *libssh_version; /* human readable string */
53 } curl_version_info_data;
55 age describes what age of this struct this is. The number depends on
57 how new libcurl you're using. You are however guaranteed to get a
58 struct that you have a matching struct for in the header, as you tell
59 libcurl your "age" with the input argument.
60 version is just an ascii string for the libcurl version.
62 version_num is a 24 bit number created like this: <8 bits major number>
64 | <8 bits minor number> | <8 bits patch number>. Version 7.9.8 is
65 therefore returned as 0x070908.
66 host is an ascii string showing what host information that this libcurl
68 was built for. As discovered by a configure script or set by the build
69 environment.
70 features can have none, one or more bits set, and the currently defined
72 bits are:
73 CURL_VERSION_IPV6
75 supports IPv6
76 CURL_VERSION_KERBEROS4
78 supports kerberos4 (when using FTP)
79 CURL_VERSION_SSL
81 supports SSL (HTTPS/FTPS) (Added in 7.10)
82 CURL_VERSION_LIBZ
84 supports HTTP deflate using libz (Added in 7.10)
85 CURL_VERSION_NTLM
87 supports HTTP NTLM (added in 7.10.6)
88 CURL_VERSION_GSSNEGOTIATE
90 supports HTTP GSS-Negotiate (added in 7.10.6)
91 CURL_VERSION_DEBUG
93 libcurl was built with extra debug capabilities built-in.
94 This is mainly of interest for libcurl hackers. (added in
95 7.10.6)
96 CURL_VERSION_ASYNCHDNS
98 libcurl was built with support for asynchronous name
99 lookups, which allows more exact timeouts (even on Win‐
100 dows) and less blocking when using the multi interface.
101 (added in 7.10.7)
102 CURL_VERSION_SPNEGO
104 libcurl was built with support for SPNEGO authentication
105 (Simple and Protected GSS-API Negotiation Mechanism,
106 defined in RFC 2478.) (added in 7.10.8)
107 CURL_VERSION_LARGEFILE
109 libcurl was built with support for large files. (Added in
110 7.11.1)
111 CURL_VERSION_IDN
113 libcurl was built with support for IDNA, domain names
114 with international letters. (Added in 7.12.0)
115 CURL_VERSION_SSPI
117 libcurl was built with support for SSPI. This is only
118 available on Windows and makes libcurl use Windows-pro‐
119 vided functions for NTLM authentication. It also allows
120 libcurl to use the current user and the current user's
121 password without the app having to pass them on. (Added
122 in 7.13.2)
123 CURL_VERSION_CONV
125 libcurl was built with support for character conversions,
126 as provided by the CUURLOPT_CONV_* callbacks. (Added in
127 7.15.4)
128 ssl_version is an ascii string for the OpenSSL version used. If libcurl
129 has no SSL support, this is NULL.
130 ssl_version_num is the numerical OpenSSL version value as defined by
132 the OpenSSL project. If libcurl has no SSL support, this is 0.
133 libz_version is an ascii string (there is no numerical version). If
135 libcurl has no libz support, this is NULL.
136 protocols is a pointer to an array of char * pointers, containing the
138 names protocols that libcurl supports (using lowercase letters). The
139 protocol names are the same as would be used in URLs. The array is ter‐
140 minated by a NULL entry.
141
143 A pointer to a curl_version_info_data struct.
144
146 curl_version(3)
147libcurl 7.16.1 2 Nov 2006 curl_version_info(3)