nbd_aio_connect_tcp(3)              LIBNBD              nbd_aio_connect_tcp(3)


NAME
       nbd_aio_connect_tcp - connect to the NBD server over a TCP port

SYNOPSIS
        #include <libnbd.h>

        int nbd_aio_connect_tcp (
              struct nbd_handle *h, const char *hostname,
              const char *port
            );

DESCRIPTION
       Begin connecting to the NBD server listening on "hostname:port".
       Parameters behave as documented in nbd_connect_tcp(3).

       You can check if the connection attempt is still underway by calling
       nbd_aio_is_connecting(3).  If nbd_set_opt_mode(3) is enabled, the
       connection is ready for manual option negotiation once
       nbd_aio_is_negotiating(3) returns true; otherwise, the connection
       attempt will include the NBD handshake, and is ready for use once
       nbd_aio_is_ready(3) returns true.

RETURN VALUE
       If the call is successful the function returns 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", "hostname", "port".
       For more information see "Non-NULL parameters" in libnbd(3).

HANDLE STATE
       nbd_aio_connect_tcp can be called when the handle is in the following
       state:

        <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>
        | Handle created, before connecting   | <?> allowed              |
        | Connecting                          | <?> error                |
        | Connecting & handshaking (opt_mode) | <?> error                |
        | Connected to the server             | <?> error                |
        | Connection shut down                | <?> error                |
        | Handle dead                         | <?> error                |
        <?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?><?>

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_CONNECT_TCP 1

SEE ALSO
       nbd_aio_is_connecting(3), nbd_aio_is_negotiating(3),
       nbd_aio_is_ready(3), nbd_connect_tcp(3), nbd_create(3),
       nbd_set_opt_mode(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_connect_tcp(3)