nescc-wiring (1)

nescc-wiring nesc-xml-file

nescc-wiring is a tool to verify that wiring constraints specified on individual components are respected in a nesC program. These wiring constraints can specify that an interface provided or used by a component must be wired at least once, at most once, or exactly once. If no wiring constraints are violated, nescc-wiring terminates with an exit status of 0. Otherwise, appropriate error messages are printed and nescc-wiring terminates with a non-zero exit status.

Wiring constraints are specified by placing @atmostonce(), @atleastonce() and @exactlyonce() attributes on the relevant interfaces. For instance, writing

  module Fun {
    provides interface Init @atleastonce();
  ...

ensures that programs using module Fun must wire its Init interface at least once.

Specifically, when the annotation is placed on a provided interface, there must be the specified number of paths in the wiring graph from any module to that interface. If the annotations are placed on a used interface, there must be the specified number of paths in the wiring graph from the interface to any module.

To use this wiring check tool, you must declare the @atmostonce(), @atleastonce() and @exactlyonce() attributes in some global header file as follows:

  struct @atleastonce() { };
  struct @atmostonce() { };
  struct @exactlyonce() { };

and you must pass the following options to nescc to create the XML file that you pass to nescc-wiring:

  -fnesc-dump=wiring
  -fnesc-dump='interfaces(!abstract())'
  -fnesc-dump='referenced(interfacedefs, components)'
  -fnesc-dumpfile=nesc-xml-file

nescc(1)