nbd_get_meta_context - return the i'th meta context request
#include <libnbd.h>
char * nbd_get_meta_context (
struct nbd_handle *h, size_t i
);During connection libnbd can negotiate zero or more metadata contexts with the server. Metadata contexts are features (such as "base:allocation") which describe information returned by the nbd_block_status_64(3) command (for "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 nbd_add_meta_context(3), and bounded by nbd_get_nr_meta_contexts(3).
This call returns a string. The caller must free the returned string to avoid a memory leak.
On error NULL is returned.
Refer to "ERROR HANDLING" in libnbd(3) for how to get further details of the error.
The following parameters must not be NULL: h. For more information see "Non-NULL parameters" in libnbd(3).
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 1nbd_add_meta_context(3), nbd_block_status_64(3), nbd_can_meta_context(3), nbd_clear_meta_contexts(3), nbd_create(3), nbd_get_nr_meta_contexts(3), libnbd(3).
Eric Blake
Richard W.M. Jones
Copyright Red Hat
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