=head1 NAME

nbd_get_meta_context - return the i'th meta context request

=head1 SYNOPSIS

 #include <libnbd.h>

 char * nbd_get_meta_context (
          struct nbd_handle *h, size_t i
        );

=head1 DESCRIPTION

During connection libnbd can negotiate zero or more metadata
contexts with the server.  Metadata contexts are features (such
as C<"base:allocation">) which describe information returned
by the L<nbd_block_status_64(3)> command (for C<"base:allocation">
this is whether blocks of data are allocated, zero or sparse).

This command returns the i'th meta context request, as added by
L<nbd_add_meta_context(3)>, and bounded by
L<nbd_get_nr_meta_contexts(3)>.

=head1 RETURN VALUE

This call returns a string.  The caller must free the
returned string to avoid a memory leak.

=head1 ERRORS

On error C<NULL> is returned.

Refer to L<libnbd(3)/ERROR HANDLING>
for how to get further details of the error.

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 1.6.

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_META_CONTEXT 1

=head1 SEE ALSO

L<nbd_add_meta_context(3)>,
L<nbd_block_status_64(3)>,
L<nbd_can_meta_context(3)>,
L<nbd_clear_meta_contexts(3)>,
L<nbd_create(3)>,
L<nbd_get_nr_meta_contexts(3)>,
L<libnbd(3)>.

=head1 AUTHORS

Eric Blake

Richard W.M. Jones

=head1 COPYRIGHT

Copyright Red Hat
