tetragon: Add entry selector data function

Signed-off-by: Jiri Olsa <[email protected]>

pkg/selectors/kernel.go

@@ -1260,22 +1260,31 @@ func InitKernelSelectors(selectors []v1alpha1.KProbeSelector, args []v1alpha1.KP
 	return kernelSelectors.data.e, nil
 }
 
-func InitKernelSelectorState(selectors []v1alpha1.KProbeSelector, args []v1alpha1.KProbeArg,
-	actionArgTable *idtable.Table, listReader ValueReader) (*KernelSelectorState, error) {
-	kernelSelectors := NewKernelSelectorState(listReader)
+func makeEntrySelector(k *KernelSelectorState, selectors []v1alpha1.KProbeSelector,
+	args []v1alpha1.KProbeArg, actionArgTable *idtable.Table) error {
 
-	WriteSelectorUint32(&kernelSelectors.data, uint32(len(selectors)))
+	WriteSelectorUint32(&k.data, uint32(len(selectors)))
 	soff := make([]uint32, len(selectors))
 	for i := range selectors {
-		soff[i] = AdvanceSelectorLength(&kernelSelectors.data)
+		soff[i] = AdvanceSelectorLength(&k.data)
 	}
 	for i, s := range selectors {
-		WriteSelectorLength(&kernelSelectors.data, soff[i])
-		loff := AdvanceSelectorLength(&kernelSelectors.data)
-		if err := parseSelector(kernelSelectors, &s, i, args, actionArgTable); err != nil {
-			return nil, err
+		WriteSelectorLength(&k.data, soff[i])
+		loff := AdvanceSelectorLength(&k.data)
+		if err := parseSelector(k, &s, i, args, actionArgTable); err != nil {
+			return err
 		}
-		WriteSelectorLength(&kernelSelectors.data, loff)
+		WriteSelectorLength(&k.data, loff)
+	}
+	return nil
+}
+
+func InitKernelSelectorState(selectors []v1alpha1.KProbeSelector, args []v1alpha1.KProbeArg,
+	actionArgTable *idtable.Table, listReader ValueReader) (*KernelSelectorState, error) {
+	kernelSelectors := NewKernelSelectorState(listReader)
+
+	if err := makeEntrySelector(kernelSelectors, selectors, args, actionArgTable); err != nil {
+		return nil, err
 	}
 	return kernelSelectors, nil
 }

pkg/selectors/selectors.go

@@ -81,7 +81,7 @@ type KernelSelectorData struct {
 }
 
 type KernelSelectorState struct {
-	data KernelSelectorData
+	data KernelSelectorData // entry probe selector
 
 	// valueMaps are used to populate value maps for InMap and NotInMap operators
 	valueMaps []ValueMap