Function findTargetInKernel

prog.go:1247–1271

findTargetInKernel attempts to find a named type in the current kernel. target will point at the found type after a successful call. Searches both vmlinux and any loaded modules. Returns a non-nil handle if the type was found in a module, [btf.ErrNotFound] if the type wasn't found or if BTF is not

(typeName string, target *btf.Type, cache *btf.Cache)

// Returns a non-nil handle if the type was found in a module, [btf.ErrNotFound]
// if the type wasn't found or if BTF is not enabled.
func findTargetInKernel(typeName string, target *btf.Type, cache *btf.Cache) (*btf.Spec, *btf.Handle, error) {
	kernelSpec, err := cache.Kernel()
	if err != nil {
		return nil, nil, fmt.Errorf("load kernel spec: %w (%w)", btf.ErrNotFound, err)
	}

	err = kernelSpec.TypeByName(typeName, target)
	if errors.Is(err, btf.ErrNotFound) {
		spec, module, err := findTargetInModule(typeName, target, cache)
		if err != nil {
			// EPERM may be returned when we do not have CAP_SYS_ADMIN.
			// Wrap error with btf.ErrNotFound so callers can handle it accordingly.
			if errors.Is(err, unix.EPERM) {
				return spec, nil, fmt.Errorf("find target in modules: %w (%w)", btf.ErrNotFound, err)
			}

			return nil, nil, fmt.Errorf("find target in modules: %w", err)
		}
		return spec, module, nil
	}
	if err != nil {
		return nil, nil, fmt.Errorf("find target in vmlinux: %w", err)
	}
	return kernelSpec, nil, err
}

// findTargetInModule attempts to find a named type in any loaded module.
//