1nbd_aio_flush(3)                    LIBNBD                    nbd_aio_flush(3)
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NAME

6       nbd_aio_flush - send flush command to the NBD server
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SYNOPSIS

9        #include <libnbd.h>
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11        typedef struct {
12          int (*callback) (void *user_data, int *error);
13          void *user_data;
14          void (*free) (void *user_data);
15        } nbd_completion_callback;
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17        int64_t nbd_aio_flush (struct nbd_handle *h,
18                               nbd_completion_callback completion_callback,
19                               uint32_t flags);
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DESCRIPTION

22       Issue the flush command to the NBD server.
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24       To check if the command completed, call nbd_aio_command_completed(3).
25       Or supply the optional "completion_callback" which will be invoked as
26       described in "Completion callbacks" in libnbd(3).
27
28       Other parameters behave as documented in nbd_flush(3).
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RETURN VALUE

31       This call returns the 64 bit cookie of the command.  The cookie is ≥ 1.
32       Cookies are unique (per libnbd handle, not globally).
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ERRORS

35       On error "-1" is returned.
36
37       Refer to "ERROR HANDLING" in libnbd(3) for how to get further details
38       of the error.
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HANDLE STATE

41       The handle must be connected and finished handshaking with the server,
42       otherwise this call will return an error.
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VERSION

45       This function first appeared in libnbd 1.0.
46
47       If you need to test if this function is available at compile time check
48       if the following macro is defined:
49
50        #define LIBNBD_HAVE_NBD_AIO_FLUSH 1
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SEE ALSO

53       "Issuing asynchronous commands" in libnbd(3), nbd_can_flush(3),
54       nbd_flush(3), nbd_create(3), libnbd(3).
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AUTHORS

57       Eric Blake
58
59       Richard W.M. Jones
60
62       Copyright (C) 2019 Red Hat Inc.
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LICENSE

65       This library is free software; you can redistribute it and/or modify it
66       under the terms of the GNU Lesser General Public License as published
67       by the Free Software Foundation; either version 2 of the License, or
68       (at your option) any later version.
69
70       This library is distributed in the hope that it will be useful, but
71       WITHOUT ANY WARRANTY; without even the implied warranty of
72       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
73       Lesser General Public License for more details.
74
75       You should have received a copy of the GNU Lesser General Public
76       License along with this library; if not, write to the Free Software
77       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
78       02110-1301 USA
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82libnbd-1.2.1                      2019-11-14                  nbd_aio_flush(3)
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