NAME¶

nbd_set_request_structured_replies - control use of structured replies

SYNOPSIS¶

 #include <libnbd.h>
 int nbd_set_request_structured_replies (
       struct nbd_handle *h, bool request
     );

DESCRIPTION¶

By default, libnbd tries to negotiate structured replies with the server, as this protocol extension must be in use before nbd_can_meta_context(3) or nbd_can_df(3) can return true. However, for integration testing, it can be useful to clear this flag rather than find a way to alter the server to fail the negotiation request. It is also useful to set this to false prior to using nbd_set_opt_mode(3) if it is desired to control when to send nbd_opt_structured_reply(3) during negotiation.

Note that setting this knob to false also disables any automatic request for extended headers.

RETURN VALUE¶

If the call is successful the function returns 0.

ERRORS¶

On error -1 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).

HANDLE STATE¶

nbd_set_request_structured_replies can be called when the handle is in the following state:

 ┌─────────────────────────────────────┬─────────────────────────┐
 │ Handle created, before connecting   │ ✅ allowed              │
 │ Connecting                          │ ❌ error                │
 │ Connecting & handshaking (opt_mode) │ ❌ error                │
 │ Connected to the server             │ ❌ error                │
 │ Connection shut down                │ ❌ error                │
 │ Handle dead                         │ ❌ error                │
 └─────────────────────────────────────┴─────────────────────────┘

VERSION¶

This function first appeared in libnbd 1.2.

If you need to test if this function is available at compile time check if the following macro is defined:

 #define LIBNBD_HAVE_NBD_SET_REQUEST_STRUCTURED_REPLIES 1

SEE ALSO¶

nbd_can_df(3), nbd_can_meta_context(3), nbd_create(3), nbd_get_request_structured_replies(3), nbd_get_structured_replies_negotiated(3), nbd_opt_structured_reply(3), nbd_set_handshake_flags(3), nbd_set_opt_mode(3), nbd_set_request_extended_headers(3), nbd_set_strict_mode(3), libnbd(3).

AUTHORS¶

Eric Blake

Richard W.M. Jones

COPYRIGHT¶

Copyright Red Hat

LICENSE¶

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA