=head1 NAME

nbd_set_uri_allow_transports - set the allowed transports in NBD URIs

=head1 SYNOPSIS

 #include <libnbd.h>

 int nbd_set_uri_allow_transports (
       struct nbd_handle *h, uint32_t mask
     );

=head1 DESCRIPTION

Set which transports are allowed to appear in NBD URIs.
The default is to allow any transport.

The C<mask> parameter may contain any of the following flags
ORed together:

=over 4

=item C<LIBNBD_ALLOW_TRANSPORT_TCP> = 0x1

=item C<LIBNBD_ALLOW_TRANSPORT_UNIX> = 0x2

=item C<LIBNBD_ALLOW_TRANSPORT_VSOCK> = 0x4

=item C<LIBNBD_ALLOW_TRANSPORT_SSH> = 0x8

=back

For convenience, the constant C<LIBNBD_ALLOW_TRANSPORT_MASK> is
available to describe all transports recognized by this build of
libnbd.  A future version of the library may add new flags.

=head1 RETURN VALUE

If the call is successful the function returns C<0>.

=head1 ERRORS

On error C<-1> is returned.

Refer to L<libnbd(3)/ERROR HANDLING>
for how to get further details of the error.

The following parameters must not be NULL: C<h>.
For more information see L<libnbd(3)/Non-NULL parameters>.

=head1 HANDLE STATE

nbd_set_uri_allow_transports
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                │
 └─────────────────────────────────────┴─────────────────────────┘

=head1 VERSION

This function first appeared in libnbd 1.2.

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

 #define LIBNBD_HAVE_NBD_SET_URI_ALLOW_TRANSPORTS 1

=head1 SEE ALSO

L<nbd_connect_uri(3)>,
L<nbd_create(3)>,
L<nbd_set_uri_allow_tls(3)>,
L<libnbd(3)>.

=head1 AUTHORS

Eric Blake

Richard W.M. Jones

=head1 COPYRIGHT

Copyright Red Hat
