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=head1 NAME
nbd_set_request_structured_replies - control use of structured replies
=head1 SYNOPSIS
#include <libnbd.h>
int nbd_set_request_structured_replies (
struct nbd_handle *h, bool request
);
=head1 DESCRIPTION
By default, libnbd tries to
negotiate structured replies with the
server, as this protocol extension must be in use before
L<nbd_can_meta_context(3)> or L<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
L<nbd_set_opt_mode(3)> if it is desired to control when to send
L<nbd_opt_structured_reply(3)> during negotiation.
Note that setting this knob to false also disables any automatic
request for extended headers.
=head1 RETURN VALUE
If the call is successful the function returns C<0>.
=head1 ERRORS
On error C<-1> 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 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 │
└─────────────────────────────────────┴─────────────────────────┘
=head1 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
=head1 SEE ALSO
L<nbd_can_df(3)>,
L<nbd_can_meta_context(3)>,
L<nbd_create(3)>,
L<nbd_get_request_structured_replies(3)>,
L<nbd_get_structured_replies_negotiated(3)>,
L<nbd_opt_structured_reply(3)>,
L<nbd_set_handshake_flags(3)>,
L<nbd_set_opt_mode(3)>,
L<nbd_set_request_extended_headers(3)>,
L<nbd_set_strict_mode(3)>,
L<libnbd(3)>.
=head1 AUTHORS
Eric Blake
Richard W.M. Jones
=head1 COPYRIGHT
Copyright Red Hat
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