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 (
12                  struct nbd_handle *h
13                );
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DESCRIPTION

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

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

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

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

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

47       Eric Blake
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49       Richard W.M. Jones
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52       Copyright Red Hat
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LICENSE

55       This library is free software; you can redistribute it and/or modify it
56       under the terms of the GNU Lesser General Public License as published
57       by the Free Software Foundation; either version 2 of the License, or
58       (at your option) any later version.
59
60       This library is distributed in the hope that it will be useful, but
61       WITHOUT ANY WARRANTY; without even the implied warranty of
62       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
63       Lesser General Public License for more details.
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65       You should have received a copy of the GNU Lesser General Public
66       License along with this library; if not, write to the Free Software
67       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
68       02110-1301 USA
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72libnbd-1.16.5                     2023-09-26 nbd_aio_peek_command_completed(3)
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