1 /* 2 * Copyright (C) 2021 The Android Open Source Project 3 * Android BPF library - public API 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 #pragma once 19 20 #include <log/log.h> 21 22 #include <android-base/properties.h> 23 24 namespace android { 25 namespace bpf { 26 27 // Wait for bpfloader to load BPF programs. waitForProgsLoaded()28static inline void waitForProgsLoaded() { 29 // infinite loop until success with 5/10/20/40/60/60/60... delay 30 for (int delay = 5;; delay *= 2) { 31 if (delay > 60) delay = 60; 32 if (android::base::WaitForProperty("bpf.progs_loaded", "1", std::chrono::seconds(delay))) 33 return; 34 ALOGW("Waited %ds for bpf.progs_loaded, still waiting...", delay); 35 } 36 } 37 38 } // namespace bpf 39 } // namespace android 40