NAME

       nbd_poll2 - poll the handle once, with fd

SYNOPSIS

        #include <libnbd.h>

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

DESCRIPTION

       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).

RETURN VALUE

       This call returns an integer ≥ 0.

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 1.16.

       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

SEE ALSO

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

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