1nbd_get_protocol(3)                 LIBNBD                 nbd_get_protocol(3)
2
3
4

NAME

6       nbd_get_protocol - return the NBD protocol variant
7

SYNOPSIS

9        #include <libnbd.h>
10
11        const char * nbd_get_protocol (struct nbd_handle *h);
12

DESCRIPTION

14       Return the NBD protocol variant in use on the connection.  At the
15       moment this returns one of the strings "oldstyle", "newstyle" or
16       "newstyle-fixed".  Other strings might be returned in the future.  Most
17       modern NBD servers use "newstyle-fixed".
18
19       This call does not block, because it returns data that is saved in the
20       handle from the NBD protocol handshake.
21

RETURN VALUE

23       This call returns a statically allocated string, valid for the lifetime
24       of the process or until libnbd is unloaded by dlclose(3).  You must not
25       try to free the string.
26

ERRORS

28       On error "NULL" is returned.
29
30       Refer to "ERROR HANDLING" in libnbd(3) for how to get further details
31       of the error.
32

HANDLE STATE

34       The handle must be connected and finished handshaking with the server,
35       or shut down, otherwise this call will return an error.
36

VERSION

38       This function first appeared in libnbd 1.2.
39
40       If you need to test if this function is available at compile time check
41       if the following macro is defined:
42
43        #define LIBNBD_HAVE_NBD_GET_PROTOCOL 1
44

SEE ALSO

46       nbd_get_handshake_flags(3), nbd_get_structured_replies_negotiated(3),
47       nbd_get_tls_negotiated(3), nbd_create(3), libnbd(3).
48

AUTHORS

50       Eric Blake
51
52       Richard W.M. Jones
53

55       Copyright (C) 2019 Red Hat Inc.
56

LICENSE

58       This library is free software; you can redistribute it and/or modify it
59       under the terms of the GNU Lesser General Public License as published
60       by the Free Software Foundation; either version 2 of the License, or
61       (at your option) any later version.
62
63       This library is distributed in the hope that it will be useful, but
64       WITHOUT ANY WARRANTY; without even the implied warranty of
65       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
66       Lesser General Public License for more details.
67
68       You should have received a copy of the GNU Lesser General Public
69       License along with this library; if not, write to the Free Software
70       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
71       02110-1301 USA
72
73
74
75libnbd-1.2.1                      2019-11-14               nbd_get_protocol(3)
Impressum