1nbd_set_request_extended_headers(3) LIBNBD nbd_set_request_extended_headers(3)
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NAME

6       nbd_set_request_extended_headers - control use of extended headers
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SYNOPSIS

9        #include <libnbd.h>
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11        int nbd_set_request_extended_headers (
12              struct nbd_handle *h, bool request
13            );
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DESCRIPTION

16       By default, libnbd tries to negotiate extended headers with the server,
17       as this protocol extension permits the use of 64-bit zero, trim, and
18       block status actions.  However, for integration testing, it can be
19       useful to clear this flag rather than find a way to alter the server to
20       fail the negotiation request.
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22       For backwards compatibility, the setting of this knob is ignored if
23       nbd_set_request_structured_replies(3) is also set to false, since the
24       use of extended headers implies structured replies.
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RETURN VALUE

27       If the call is successful the function returns 0.
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ERRORS

30       On error -1 is returned.
31
32       Refer to "ERROR HANDLING" in libnbd(3) for how to get further details
33       of the error.
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35       The following parameters must not be NULL: "h".  For more information
36       see "Non-NULL parameters" in libnbd(3).
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HANDLE STATE

39       The handle must be newly created, otherwise this call will return an
40       error.
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VERSION

43       This function first appeared in libnbd 1.18.
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45       If you need to test if this function is available at compile time check
46       if the following macro is defined:
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48        #define LIBNBD_HAVE_NBD_SET_REQUEST_EXTENDED_HEADERS 1
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SEE ALSO

51       nbd_block_status_64(3), nbd_cache(3), nbd_create(3),
52       nbd_get_extended_headers_negotiated(3),
53       nbd_get_request_extended_headers(3), nbd_opt_extended_headers(3),
54       nbd_set_handshake_flags(3), nbd_set_request_structured_replies(3),
55       nbd_set_strict_mode(3), nbd_trim(3), nbd_zero(3), libnbd(3).
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AUTHORS

58       Eric Blake
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60       Richard W.M. Jones
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63       Copyright Red Hat
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LICENSE

66       This library is free software; you can redistribute it and/or modify it
67       under the terms of the GNU Lesser General Public License as published
68       by the Free Software Foundation; either version 2 of the License, or
69       (at your option) any later version.
70
71       This library is distributed in the hope that it will be useful, but
72       WITHOUT ANY WARRANTY; without even the implied warranty of
73       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
74       Lesser General Public License for more details.
75
76       You should have received a copy of the GNU Lesser General Public
77       License along with this library; if not, write to the Free Software
78       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
79       02110-1301 USA
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83libnbd-1.18.1                     2023-10-31nbd_set_request_extended_headers(3)
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