LegacySupport.h revision f1b7028bb0f43603aaa9d7c1d9aedf7c1e86b0a0 
1/*
2 * Copyright (C) 2016 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 <hidl/HidlTransportSupport.h>
18#include <sys/wait.h>
19#include <utils/Log.h>
20#include <utils/Errors.h>
21#include <utils/StrongPointer.h>
22
23#ifndef ANDROID_HIDL_LEGACY_SUPPORT_H
24#define ANDROID_HIDL_LEGACY_SUPPORT_H
25
26namespace android {
27namespace hardware {
28
29namespace details {
30bool blockingHalBinderizationEnabled();
31void blockIfBinderizationDisabled(const std::string& interface,
32                                  const std::string& instance);
33} // namespace details
34
35/**
36 * Registers passthrough service implementation.
37 */
38template<class Interface>
39__attribute__((warn_unused_result))
40status_t registerPassthroughServiceImplementation(
41        std::string name = "default") {
42    // TODO(b/34274385)
43    // If binderization is enabled, we should start up. Otherwise, wait around.
44    // If we return/kill ourselves, we will just be restarted by init. This
45    // function is only called from thin wrapping services, so blocking won't
46    // stop anything important from happening.
47    details::blockIfBinderizationDisabled(Interface::descriptor, name);
48
49    sp<Interface> service = Interface::getService(name, true /* getStub */);
50
51    if (service == nullptr) {
52        ALOGE("Could not get passthrough implementation for %s/%s.",
53            Interface::descriptor, name.c_str());
54        return EXIT_FAILURE;
55    }
56
57    LOG_FATAL_IF(service->isRemote(), "Implementation of %s/%s is remote!",
58            Interface::descriptor, name.c_str());
59
60    status_t status = service->registerAsService(name);
61
62    if (status == OK) {
63        ALOGI("Registration complete for %s/%s.",
64            Interface::descriptor, name.c_str());
65    } else {
66        ALOGE("Could not register service %s/%s (%d).",
67            Interface::descriptor, name.c_str(), status);
68    }
69
70    return status;
71}
72
73/**
74 * Creates default passthrough service implementation. This method never returns.
75 *
76 * Return value is exit status.
77 */
78template<class Interface>
79__attribute__((warn_unused_result))
80status_t defaultPassthroughServiceImplementation(std::string name,
81                                            size_t maxThreads = 1) {
82    configureRpcThreadpool(maxThreads, true);
83    status_t result = registerPassthroughServiceImplementation<Interface>(name);
84
85    if (result != OK) {
86        return result;
87    }
88
89    joinRpcThreadpool();
90    return 0;
91}
92template<class Interface>
93__attribute__((warn_unused_result))
94status_t defaultPassthroughServiceImplementation(size_t maxThreads = 1) {
95    return defaultPassthroughServiceImplementation<Interface>("default", maxThreads);
96}
97
98}  // namespace hardware
99}  // namespace android
100
101#endif  // ANDROID_HIDL_LEGACY_SUPPORT_H
102