=head1 NAME

nbd_set_debug - set or clear the debug flag

=head1 SYNOPSIS

 #include <libnbd.h>

 int nbd_set_debug (
       struct nbd_handle *h, bool debug
     );

=head1 DESCRIPTION

Set or clear the debug flag.  When debugging is enabled,
debugging messages from the library are printed to stderr,
unless a debugging callback has been defined too
(see L<nbd_set_debug_callback(3)>) in which case they are
sent to that function.  This flag defaults to false on
newly created handles, except if C<LIBNBD_DEBUG=1> is
set in the environment in which case it defaults to true.

=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 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_SET_DEBUG 1

=head1 SEE ALSO

L<nbd_create(3)>,
L<nbd_set_debug_callback(3)>,
L<nbd_set_handle_name(3)>,
L<libnbd(3)>.

=head1 AUTHORS

Eric Blake

Richard W.M. Jones

=head1 COPYRIGHT

Copyright Red Hat
