1 /*
2 * Copyright (C) 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "Utils.h"
18 #include <hwbinder/HidlSupport.h>
19
20 #include <string.h>
21 #include <android-base/logging.h>
22 #include <android-base/properties.h>
23
24 namespace android::hardware {
25
zeroMemory(uint8_t * data,size_t size)26 void zeroMemory(uint8_t* data, size_t size) {
27 memset(data, 0, size);
28 }
29
isHwServiceManagerInstalled()30 static bool isHwServiceManagerInstalled() {
31 return access("/system_ext/bin/hwservicemanager", F_OK) == 0 ||
32 access("/system/system_ext/bin/hwservicemanager", F_OK) == 0 ||
33 access("/system/bin/hwservicemanager", F_OK) == 0;
34 }
35
waitForHwServiceManager()36 static bool waitForHwServiceManager() {
37 if (!isHwServiceManagerInstalled()) {
38 return false;
39 }
40 // TODO(b/31559095): need bionic host so that we can use 'prop_info' returned
41 // from WaitForProperty
42 #ifdef __ANDROID__
43 static const char* kHwServicemanagerReadyProperty = "hwservicemanager.ready";
44
45 using std::literals::chrono_literals::operator""s;
46
47 using android::base::WaitForProperty;
48 while (true) {
49 if (base::GetBoolProperty("hwservicemanager.disabled", false)) {
50 return false;
51 }
52 if (WaitForProperty(kHwServicemanagerReadyProperty, "true", 1s)) {
53 return true;
54 }
55 LOG(WARNING) << "Waited for hwservicemanager.ready for a second, waiting another...";
56 }
57 #endif // __ANDROID__
58 return true;
59 }
60
isHwbinderSupportedBlocking()61 bool isHwbinderSupportedBlocking() {
62 return waitForHwServiceManager();
63 }
64 } // namespace android::hardware
65