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).
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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.
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47       If you need to test if this function is available at compile time check
48       if the following macro is defined:
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50        #define LIBNBD_HAVE_NBD_AIO_FLUSH 1
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SEE ALSO

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

57       Eric Blake
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59       Richard W.M. Jones
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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-1.3.7                      2020-04-23                  nbd_aio_flush(3)
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