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 (C) 2019-2021 Red Hat Inc.

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