nbd_aio_command_completed(3)        LIBNBD        nbd_aio_command_completed(3)


NAME
       nbd_aio_command_completed - check if the command completed

SYNOPSIS
        #include <libnbd.h>

        int nbd_aio_command_completed (
              struct nbd_handle *h, uint64_t cookie
            );

DESCRIPTION
       Return true if the command completed.  If this function returns true
       then the command was successful and it has been retired.  Return false
       if the command is still in flight.  This can also fail with an error in
       case the command failed (in this case the command is also retired).  A
       command is retired either via this command, or by using a completion
       callback which returns 1.

       The "cookie" parameter is the positive unique 64 bit cookie for the
       command, as returned by a call such as nbd_aio_pread(3).

RETURN VALUE
       This call returns a boolean value.

ERRORS
       On error -1 is returned.

       Refer to "ERROR HANDLING" in libnbd(3) for how to get further details
       of the error.

       The following parameters must not be NULL: "h".  For more information
       see "Non-NULL parameters" in libnbd(3).

VERSION
       This function first appeared in libnbd 1.0.

       If you need to test if this function is available at compile time check
       if the following macro is defined:

        #define LIBNBD_HAVE_NBD_AIO_COMMAND_COMPLETED 1

SEE ALSO
       nbd_aio_pread(3), nbd_create(3), libnbd(3).

AUTHORS
       Eric Blake

       Richard W.M. Jones

COPYRIGHT
       Copyright Red Hat

LICENSE
       This library is free software; you can redistribute it and/or modify it
       under the terms of the GNU Lesser General Public License as published
       by the Free Software Foundation; either version 2 of the License, or
       (at your option) any later version.

       This library is distributed in the hope that it will be useful, but
       WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       Lesser General Public License for more details.

       You should have received a copy of the GNU Lesser General Public
       License along with this library; if not, write to the Free Software
       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
       02110-1301 USA

libnbd-1.20.0                     2024-05-31      nbd_aio_command_completed(3)