docs/libcurl/curl_version_info.3

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.TH curl_version_info 3 "30 Sep 2002" "libcurl 7.10" "libcurl Manual"
.SH NAME
curl_version_info - returns run-time libcurl version info
.SH SYNOPSIS
.B #include <curl/curl.h>
.sp
.BI "curl_version_info_data *curl_version_info( CURLversion "type ");"
.ad
.SH DESCRIPTION
Returns a pointer to a filled in struct with information about various
run-time features in libcurl. \fItype\fP 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

.nf
typedef struct {
  CURLversion age;          /* 0 - this kind of struct */
  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 */
  char *libz_version;       /* human readable string */
  const char *protocols[];  /* list of protocols */
} curl_version_info_data;
.fi

\fIage\fP describes what kind of struct this is. It is always 0 now. In a
future libcurl, if this struct changes, this age counter may be increased, and
then the struct for number 1 will look different (except for this first struct
field).

\fIversion\fP is just an ascii string for the libcurl version.

\fIversion_num\fP is a 6 digit hexadecimal number created like this: <2 digits
major number> | <2 digits minor number> | <2 digits patch number>. Version
7.9.8 is therefore returned as 0x070908.

\fIhost\fP 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.

\fIfeatures\fP can have none, one or more bits set, and the currently defined
bits are:
.TP 5.5
.B CURL_VERSION_IPV6
supports IPv6
.TP
.B CURL_VERSION_KERBEROS4
supports kerberos4 (when using FTP)
.TP
.B CURL_VERSION_SSL
supports SSL (HTTPS/FTPS)
.TP
.B CURL_VERSION_LIBZ
supports HTTP deflate using libz
.PP
\fIssl_version\fP is an ascii string for the OpenSSL version used. If libcurl
has no SSL support, this is NULL.

\fIssl_version_num\fP is the numerical OpenSSL version value as defined by the
OpenSSL project. If libcurl has no SSL support, this is 0.

\fIlibz_version\fP is an ascii string (there is no numerical version). If
libcurl has no libz support, this is NULL.

\fIprotocols\fP 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.


.SH RETURN VALUE
A pointer to a curl_version_info_data struct.
.SH "SEE ALSO"
\fIcurl_version(3)\fP
.SH BUGS
No known bugs.