nbd_opt_info - request the server for information about an export
#include <libnbd.h> int nbd_opt_info (struct nbd_handle *h);
Request that the server supply information about the export name previously specified by the most recent nbd_set_export_name(3) or nbd_connect_uri(3). This can only be used if nbd_set_opt_mode(3) enabled option mode.
If successful, functions like nbd_is_read_only(3) and nbd_get_size(3) will report details about that export. In general, if nbd_opt_go(3) is called next, that call will likely succeed with the details remaining the same, although this is not guaranteed by all servers.
Not all servers understand this request, and even when it is understood, the server might fail the request even when a corresponding nbd_opt_go(3) would succeed.
If the call is successful the function returns
-1 is returned.
Refer to "ERROR HANDLING" in libnbd(3) for how to get further details of the error.
The handle must be negotiating, otherwise this call will return an error.
This function first appeared in libnbd 1.4.
If you need to test if this function is available at compile time check if the following macro is defined:
#define LIBNBD_HAVE_NBD_OPT_INFO 1
nbd_aio_opt_info(3), nbd_connect_uri(3), nbd_create(3), nbd_get_size(3), nbd_is_read_only(3), nbd_opt_go(3), nbd_set_export_name(3), nbd_set_opt_mode(3), libnbd(3).
Richard W.M. Jones
Copyright (C) 2019-2021 Red Hat Inc.
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