platform: Improve iOS OOM killer

service/oomkiller/service_stub.go

@@ -0,0 +1,39 @@
+//go:build !darwin || !cgo
+
+package oomkiller
+
+import (
+	"context"
+
+	"github.com/sagernet/sing-box/adapter"
+	boxService "github.com/sagernet/sing-box/adapter/service"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/log"
+	"github.com/sagernet/sing-box/option"
+	E "github.com/sagernet/sing/common/exceptions"
+)
+
+func RegisterService(registry *boxService.Registry) {
+	boxService.Register[option.OOMKillerServiceOptions](registry, C.TypeOOMKiller, NewService)
+}
+
+type Service struct {
+	boxService.Adapter
+}
+
+func NewService(ctx context.Context, logger log.ContextLogger, tag string, options option.OOMKillerServiceOptions) (adapter.Service, error) {
+	return &Service{
+		Adapter: boxService.NewAdapter(C.TypeOOMKiller, tag),
+	}, nil
+}
+
+func (s *Service) Start(stage adapter.StartStage) error {
+	if stage != adapter.StartStateStart {
+		return nil
+	}
+	return E.New("memory pressure monitoring is not available on this platform")
+}
+
+func (s *Service) Close() error {
+	return nil
+}