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This returns the number of whole block devices added. It is usually simpler to call this than to list the devices and count them, which is what we do in some places in the current codebase.
This program generates a large amount of code and documentation for all the daemon actions. To add a new action there are only two files you need to change, 'generator_actions.ml' to describe the interface, and daemon/<somefile>.c to write the implementation. After editing these files, build it (make -C generator) to regenerate all the output files. 'make' will rerun this automatically when necessary. IMPORTANT: This program should NOT print any warnings at compile time or run time. If it prints warnings, you should treat them as errors. OCaml tips: (1) In emacs, install tuareg-mode to display and format OCaml code correctly. 'vim' comes with a good OCaml editing mode by default. (2) Read the resources at http://ocaml-tutorial.org/ (3) A module called 'Generator_foo' is defined in one or two files called 'generator_foo.mli' and 'generator_foo.ml' (NB: lowercase first letter). The *.mli file, if present, defines the public interface for the module. The *.ml file is the implementation. If the *.mli file is missing then everything is exported. Some notable files in this directory: generator_actions.ml The libguestfs API. generator_structs.ml Structures returned by the API. generator_c.ml Generate C API. generator_<lang>.ml Generate bindings for <lang>. generator_main.ml The main generator program.