1nbd_aio_peek_command_completed(3)   LIBNBD   nbd_aio_peek_command_completed(3)
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NAME

6       nbd_aio_peek_command_completed - check if any command has completed
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SYNOPSIS

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

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

25       On error "-1" is returned.
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27       Refer to "ERROR HANDLING" in libnbd(3) for how to get further details
28       of the error.
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VERSION

31       This function first appeared in libnbd 1.0.
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33       If you need to test if this function is available at compile time check
34       if the following macro is defined:
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36        #define LIBNBD_HAVE_NBD_AIO_PEEK_COMMAND_COMPLETED 1
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SEE ALSO

39       nbd_aio_command_completed(3), nbd_create(3), libnbd(3).
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AUTHORS

42       Eric Blake
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44       Richard W.M. Jones
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47       Copyright (C) 2019-2021 Red Hat Inc.
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LICENSE

50       This library is free software; you can redistribute it and/or modify it
51       under the terms of the GNU Lesser General Public License as published
52       by the Free Software Foundation; either version 2 of the License, or
53       (at your option) any later version.
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55       This library is distributed in the hope that it will be useful, but
56       WITHOUT ANY WARRANTY; without even the implied warranty of
57       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
58       Lesser General Public License for more details.
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60       You should have received a copy of the GNU Lesser General Public
61       License along with this library; if not, write to the Free Software
62       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
63       02110-1301 USA
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67libnbd-1.7.12                     2021-05-29 nbd_aio_peek_command_completed(3)
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