nbd_poll2 - poll the handle once, with fd

       Eric Blake

       Richard W.M. Jones

       Copyright Red Hat

       This is the same as nbd_poll(3), but an additional file descriptor parameter is passed.  The additional
       fd is also polled (using "POLLIN").  One use for this is to wait for an eventfd(2).

       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).

       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-1.22.2                                      2025-06-16                                       nbd_poll2(3)

       nbd_poll2 - poll the handle once, with fd

       This call returns an integer ≥ 0.

nbd_create(3), nbd_poll(3), libnbd(3), eventfd(2).

        #include <libnbd.h>

        int nbd_poll2 (
              struct nbd_handle *h, int fd, int timeout
            );

       This function first appeared in libnbd 1.16.

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

        #define LIBNBD_HAVE_NBD_POLL2 1