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=head1 NAME
nbd_aio_get_fd - return file descriptor associated with this connection
=head1 SYNOPSIS
#include <libnbd.h>
int nbd_aio_get_fd (
struct nbd_handle *h
);
=head1 DESCRIPTION
Return the underlying file descriptor associated with this
connection. You can use this to check if the file descriptor
is ready for reading or writing and call L<nbd_aio_notify_read(3)>
or L<nbd_aio_notify_write(3)>. See also L<nbd_aio_get_direction(3)>.
Do not do anything else with the file descriptor.
=head1 RETURN VALUE
This call returns a file descriptor.
=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 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_GET_FD 1
=head1 SEE ALSO
L<nbd_aio_get_direction(3)>,
L<nbd_aio_notify_read(3)>,
L<nbd_aio_notify_write(3)>,
L<nbd_create(3)>,
L<libnbd(3)>.
=head1 AUTHORS
Eric Blake
Richard W.M. Jones
=head1 COPYRIGHT
Copyright Red Hat
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