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The Android Open Source Projectcbb10112009-03-03 19:31:44 -08001/*
2 * Copyright (C) 2005 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
Dianne Hackbornc1309d72012-05-08 18:54:22 -070017#define LOG_TAG "misc"
18
The Android Open Source Projectcbb10112009-03-03 19:31:44 -080019#include <utils/misc.h>
Steven Moreland8da96132017-04-13 15:17:59 -070020
21#include <pthread.h>
22
Dianne Hackbornc1309d72012-05-08 18:54:22 -070023#include <utils/Log.h>
Dianne Hackbornc1309d72012-05-08 18:54:22 -070024#include <utils/Vector.h>
25
Jiyong Park011ee122018-05-29 16:41:30 +090026#if defined(__ANDROID__) && !defined(__ANDROID_RECOVERY__)
Jiyong Park0b3c24b2017-05-26 17:57:18 +090027#include <dlfcn.h>
28#include <vndksupport/linker.h>
29#endif
30
31extern "C" void do_report_sysprop_change();
32
The Android Open Source Projectcbb10112009-03-03 19:31:44 -080033using namespace android;
34
35namespace android {
36
Dianne Hackbornc1309d72012-05-08 18:54:22 -070037struct sysprop_change_callback_info {
38 sysprop_change_callback callback;
39 int priority;
40};
The Android Open Source Projectcbb10112009-03-03 19:31:44 -080041
Yabin Cui4a6e5a32015-01-26 19:48:54 -080042#if !defined(_WIN32)
Dianne Hackbornc1309d72012-05-08 18:54:22 -070043static pthread_mutex_t gSyspropMutex = PTHREAD_MUTEX_INITIALIZER;
Yi Konge1731a42018-07-16 18:11:34 -070044static Vector<sysprop_change_callback_info>* gSyspropList = nullptr;
Dianne Hackbornc1309d72012-05-08 18:54:22 -070045#endif
46
Yabin Cui4a6e5a32015-01-26 19:48:54 -080047#if !defined(_WIN32)
Dan Willemsen528f1442017-11-29 18:06:11 -080048void add_sysprop_change_callback(sysprop_change_callback cb, int priority) {
Dianne Hackbornc1309d72012-05-08 18:54:22 -070049 pthread_mutex_lock(&gSyspropMutex);
Yi Konge1731a42018-07-16 18:11:34 -070050 if (gSyspropList == nullptr) {
Dianne Hackbornc1309d72012-05-08 18:54:22 -070051 gSyspropList = new Vector<sysprop_change_callback_info>();
52 }
53 sysprop_change_callback_info info;
54 info.callback = cb;
55 info.priority = priority;
56 bool added = false;
57 for (size_t i=0; i<gSyspropList->size(); i++) {
58 if (priority >= gSyspropList->itemAt(i).priority) {
59 gSyspropList->insertAt(info, i);
60 added = true;
61 break;
62 }
63 }
64 if (!added) {
65 gSyspropList->add(info);
66 }
67 pthread_mutex_unlock(&gSyspropMutex);
Dianne Hackbornc1309d72012-05-08 18:54:22 -070068}
Dan Willemsen528f1442017-11-29 18:06:11 -080069#else
70void add_sysprop_change_callback(sysprop_change_callback, int) {}
71#endif
Dianne Hackbornc1309d72012-05-08 18:54:22 -070072
Jiyong Park011ee122018-05-29 16:41:30 +090073#if defined(__ANDROID__) && !defined(__ANDROID_RECOVERY__)
Jiyong Park0b3c24b2017-05-26 17:57:18 +090074void (*get_report_sysprop_change_func())() {
75 void (*func)() = nullptr;
76 void* handle = android_load_sphal_library("libutils.so", RTLD_NOW);
77 if (handle != nullptr) {
78 func = reinterpret_cast<decltype(func)>(dlsym(handle, "do_report_sysprop_change"));
79 }
80
81 return func;
82}
83#endif
84
Dianne Hackbornc1309d72012-05-08 18:54:22 -070085void report_sysprop_change() {
Jiyong Park0b3c24b2017-05-26 17:57:18 +090086 do_report_sysprop_change();
87
Jiyong Park011ee122018-05-29 16:41:30 +090088#if defined(__ANDROID__) && !defined(__ANDROID_RECOVERY__)
Jiyong Park0b3c24b2017-05-26 17:57:18 +090089 // libutils.so is double loaded; from the default namespace and from the
90 // 'sphal' namespace. Redirect the sysprop change event to the other instance
91 // of libutils.so loaded in the 'sphal' namespace so that listeners attached
92 // to that instance is also notified with this event.
93 static auto func = get_report_sysprop_change_func();
94 if (func != nullptr) {
95 (*func)();
96 }
97#endif
98}
99
100}; // namespace android
101
102void do_report_sysprop_change() {
Yabin Cui4a6e5a32015-01-26 19:48:54 -0800103#if !defined(_WIN32)
Dianne Hackbornc1309d72012-05-08 18:54:22 -0700104 pthread_mutex_lock(&gSyspropMutex);
105 Vector<sysprop_change_callback_info> listeners;
Yi Konge1731a42018-07-16 18:11:34 -0700106 if (gSyspropList != nullptr) {
Dianne Hackbornc1309d72012-05-08 18:54:22 -0700107 listeners = *gSyspropList;
108 }
109 pthread_mutex_unlock(&gSyspropMutex);
110
111 //ALOGI("Reporting sysprop change to %d listeners", listeners.size());
112 for (size_t i=0; i<listeners.size(); i++) {
113 listeners[i].callback();
114 }
115#endif
116}