1nbd_aio_command_completed(3) LIBNBD nbd_aio_command_completed(3)
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6 nbd_aio_command_completed - check if the command completed
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9 #include <libnbd.h>
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11 int nbd_aio_command_completed (struct nbd_handle *h,
12 uint64_t cookie);
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15 Return true if the command completed. If this function returns true
16 then the command was successful and it has been retired. Return false
17 if the command is still in flight. This can also fail with an error in
18 case the command failed (in this case the command is also retired). A
19 command is retired either via this command, or by using a completion
20 callback which returns 1.
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22 The "cookie" parameter is the positive unique 64 bit cookie for the
23 command, as returned by a call such as nbd_aio_pread(3).
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26 This call returns a boolean value.
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29 On error "-1" is returned.
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31 Refer to "ERROR HANDLING" in libnbd(3) for how to get further details
32 of the error.
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35 This function first appeared in libnbd 1.0.
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37 If you need to test if this function is available at compile time check
38 if the following macro is defined:
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40 #define LIBNBD_HAVE_NBD_AIO_COMMAND_COMPLETED 1
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43 nbd_aio_pread(3), nbd_create(3), libnbd(3).
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46 Eric Blake
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48 Richard W.M. Jones
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51 Copyright (C) 2019-2021 Red Hat Inc.
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54 This library is free software; you can redistribute it and/or modify it
55 under the terms of the GNU Lesser General Public License as published
56 by the Free Software Foundation; either version 2 of the License, or
57 (at your option) any later version.
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59 This library is distributed in the hope that it will be useful, but
60 WITHOUT ANY WARRANTY; without even the implied warranty of
61 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
62 Lesser General Public License for more details.
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64 You should have received a copy of the GNU Lesser General Public
65 License along with this library; if not, write to the Free Software
66 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
67 02110-1301 USA
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71libnbd-1.7.12 2021-05-29 nbd_aio_command_completed(3)