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=pod
=head1 NAME
OPENSSL_VERSION_NUMBER, SSLeay, SSLeay_version - get OpenSSL version number
=head1 SYNOPSIS
#include <openssl/opensslv.h>
#define OPENSSL_VERSION_NUMBER 0xnnnnnnnnnL
#include <openssl/crypto.h>
long SSLeay(void);
const char *SSLeay_version(int t);
=head1 DESCRIPTION
OPENSSL_VERSION_NUMBER is a numeric release version identifier:
MMNNFFPPS: major minor fix patch status
The status nibble has one of the values 0 for development, 1 to e for betas
1 to 14, and f for release.
for example
0x000906000 == 0.9.6 dev
0x000906023 == 0.9.6b beta 3
0x00090605f == 0.9.6e release
Versions prior to 0.9.3 have identifiers E<lt> 0x0930.
Versions between 0.9.3 and 0.9.5 had a version identifier with this
interpretation:
MMNNFFRBB major minor fix final beta/patch
for example
0x000904100 == 0.9.4 release
0x000905000 == 0.9.5 dev
Version 0.9.5a had an interim interpretation that is like the current one,
except the patch level got the highest bit set, to keep continuity. The
number was therefore 0x0090581f.
For backward compatibility, SSLEAY_VERSION_NUMBER is also defined.
SSLeay() returns this number. The return value can be compared to the
macro to make sure that the correct version of the library has been
loaded, especially when using DLLs on Windows systems.
SSLeay_version() returns different strings depending on B<t>:
=over 4
=item SSLEAY_VERSION
The text variant of the version number and the release date. For example,
"OpenSSL 0.9.5a 1 Apr 2000".
=item SSLEAY_CFLAGS
The compiler flags set for the compilation process in the form
"compiler: ..." if available or "compiler: information not available"
otherwise.
=item SSLEAY_BUILT_ON
The date of the build process in the form "built on: ..." if available
or "built on: date not available" otherwise.
=item SSLEAY_PLATFORM
The "Configure" target of the library build in the form "platform: ..."
if available or "platform: information not available" otherwise.
=item SSLEAY_DIR
The "OPENSSLDIR" setting of the library build in the form "OPENSSLDIR: "...""
if available or "OPENSSLDIR: N/A" otherwise.
=back
For an unknown B<t>, the text "not available" is returned.
=head1 RETURN VALUE
The version number.
=head1 SEE ALSO
L<crypto(3)|crypto(3)>
=head1 HISTORY
SSLeay() and SSLEAY_VERSION_NUMBER are available in all versions of SSLeay and OpenSSL.
OPENSSL_VERSION_NUMBER is available in all versions of OpenSSL.
B<SSLEAY_DIR> was added in OpenSSL 0.9.7.
=cut
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