On Mon, Oct 31, 2016 at 02:59:59PM +0300, Ponomarenko Andrey wrote: A few things: You can ignore guestfs_internal_* APIs. As the name suggests no ABI guarantees are made for those symbols. I don't agree with the conclusions in this web page related to guestfs_add_domain_argv and guestfs_add_drive_opts_argv: https://abi-laboratory.pro/tracker/compat_report/libguestfs/1.26.10/1.28.... The initial bitmask in the struct controls which fields are present, and we handle old caller / new library (and indeed new caller / old library) correctly as far as I know. I understand that there's insufficient information in a C header file to really describe this stuff, but there we are. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top