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=head1 NAME
nbd_get_version_extra - return the extra version of the library
=head1 SYNOPSIS
#include <libnbd.h>
const char * nbd_get_version_extra (
struct nbd_handle *h
);
=head1 DESCRIPTION
Return the extra version of libnbd. This is a freeform string
which is set at package build time using:
./configure --with-extra="..."
and it intended to be used by downstream packagers (eg. Linux distributions)
to convey extra version information, such as the precise version of
the libnbd RPM, C<.deb> etc.
The string may be C<"">, indicating that no extra version information
is available, or that this is an upstream build of libnbd.
=head1 RETURN VALUE
This call returns a statically allocated string, valid for the
lifetime of the process or until libnbd is unloaded by
L<dlclose(3)>. You B<must not> try to free the string.
=head1 ERRORS
This function does not fail.
The following parameters must not be NULL: C<h>.
For more information see L<libnbd(3)/Non-NULL parameters>.
=head1 VERSION
This function first appeared in libnbd 1.24.
If you need to test if this function is available at compile time
check if the following macro is defined:
#define LIBNBD_HAVE_NBD_GET_VERSION_EXTRA 1
=head1 SEE ALSO
L<nbd_create(3)>,
L<nbd_get_package_name(3)>,
L<nbd_get_version_extra(3)>,
L<libnbd(3)>.
=head1 AUTHORS
Eric Blake
Richard W.M. Jones
=head1 COPYRIGHT
Copyright Red Hat
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