1nbd_aio_peek_command_completed(3)   LIBNBD   nbd_aio_peek_command_completed(3)
2
3
4

NAME

6       nbd_aio_peek_command_completed - check if any command has completed
7

SYNOPSIS

9        #include <libnbd.h>
10
11        int64_t nbd_aio_peek_command_completed (struct nbd_handle *h);
12

DESCRIPTION

14       Return the unique positive 64 bit cookie of the first non-retired but
15       completed command, 0 if there are in-flight commands but none of them
16       are awaiting retirement, or "-1" on error including when there are no
17       in-flight commands. Any cookie returned by this function must still be
18       passed to nbd_aio_command_completed(3) to actually retire the command
19       and learn whether the command was successful.
20

RETURN VALUE

22       This call returns a 64 bit signed integer ≥ 0.
23

ERRORS

25       On error "-1" is returned.
26
27       Refer to "ERROR HANDLING" in libnbd(3) for how to get further details
28       of the error.
29
30       The following parameters must not be NULL: "h".  For more information
31       see "Non-NULL parameters" in libnbd(3).
32

VERSION

34       This function first appeared in libnbd 1.0.
35
36       If you need to test if this function is available at compile time check
37       if the following macro is defined:
38
39        #define LIBNBD_HAVE_NBD_AIO_PEEK_COMMAND_COMPLETED 1
40

SEE ALSO

42       nbd_aio_command_completed(3), nbd_create(3), libnbd(3).
43

AUTHORS

45       Eric Blake
46
47       Richard W.M. Jones
48

50       Copyright (C) 2019-2021 Red Hat Inc.
51

LICENSE

53       This library is free software; you can redistribute it and/or modify it
54       under the terms of the GNU Lesser General Public License as published
55       by the Free Software Foundation; either version 2 of the License, or
56       (at your option) any later version.
57
58       This library is distributed in the hope that it will be useful, but
59       WITHOUT ANY WARRANTY; without even the implied warranty of
60       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
61       Lesser General Public License for more details.
62
63       You should have received a copy of the GNU Lesser General Public
64       License along with this library; if not, write to the Free Software
65       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
66       02110-1301 USA
67
68
69
70libnbd-1.14.2                     2023-01-03 nbd_aio_peek_command_completed(3)
Impressum