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resolve_backend

nros_rmw_cffi

Function resolve_backend 

Source 
pub fn resolve_backend(selector: Option<&[u8]>) -> BackendResolution
Expand description

Phase 128.A.3 — selection policy for the single-backend Executor::open / nros::init path.

Algorithm:

  1. If selector is Some(name) (typically from $NROS_RMW), look it up in the registry. Hit → BackendResolution::Single; miss → BackendResolution::Unknown.
  2. Otherwise, if exactly one backend is registered, return it.
  3. Otherwise, if zero, BackendResolution::NoBackend; if more than one, BackendResolution::Ambiguous.

Callers convert the resolution to a NrosRmwRet via backend_resolution_to_ret.

Bridge consumers (Executor::open_multi) bypass this function and call nros_rmw_cffi_lookup per spec instead.