Richard W.M. Jones wrote: Just a quick note to say that I've upgraded the bindings again. - Included the fix for domain/network handles in mlvirsh (http://www.redhat.com/archives/libvir-list/2007-June/msg00361.html) - Connections, domain and network handles are now statically typed "read-write" or "read-only". C.connect gives you a read-write connection handle. C.connect_readonly gives you a read-only connection handle. From a read-only connection handle you can only derive read-only domain and network handles. You can demote a read-write handle to a read-only handle using the C/D/N.const functions, but obviously not the other way around. This makes it impossible to compile programs that do write/update things on read-only handles. No code changes are required[1] and there is no runtime penalty. As a good example of this, see http://et.redhat.com/~rjones/ocaml-libvirt/html/Libvirt.Domain.html#VALcr... and the subsequent functions. Rich. [1] Well, unless you were doing unsafe things with read-only handles before, in which case you need to fix your program! -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903