The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 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 | #define LOG_TAG "UEventObserver" |
Jeff Brown | 9cf36b7 | 2012-10-10 17:17:58 -0700 | [diff] [blame] | 18 | //#define LOG_NDEBUG 0 |
| 19 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 20 | #include "utils/Log.h" |
| 21 | |
| 22 | #include "hardware_legacy/uevent.h" |
| 23 | #include "jni.h" |
| 24 | #include "JNIHelp.h" |
Andreas Gampe | ed6b9df | 2014-11-20 22:02:20 -0800 | [diff] [blame] | 25 | #include "core_jni_helpers.h" |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 26 | |
Jeff Brown | 9cf36b7 | 2012-10-10 17:17:58 -0700 | [diff] [blame] | 27 | #include <utils/Mutex.h> |
| 28 | #include <utils/Vector.h> |
| 29 | #include <utils/String8.h> |
| 30 | #include <ScopedUtfChars.h> |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 31 | |
Jeff Brown | 9cf36b7 | 2012-10-10 17:17:58 -0700 | [diff] [blame] | 32 | namespace android { |
| 33 | |
| 34 | static Mutex gMatchesMutex; |
| 35 | static Vector<String8> gMatches; |
| 36 | |
| 37 | static void nativeSetup(JNIEnv *env, jclass clazz) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 38 | if (!uevent_init()) { |
| 39 | jniThrowException(env, "java/lang/RuntimeException", |
Jeff Brown | 9cf36b7 | 2012-10-10 17:17:58 -0700 | [diff] [blame] | 40 | "Unable to open socket for UEventObserver"); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 41 | } |
| 42 | } |
| 43 | |
Jeff Brown | 9cf36b7 | 2012-10-10 17:17:58 -0700 | [diff] [blame] | 44 | static bool isMatch(const char* buffer, size_t length) { |
| 45 | AutoMutex _l(gMatchesMutex); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 46 | |
Jeff Brown | 9cf36b7 | 2012-10-10 17:17:58 -0700 | [diff] [blame] | 47 | for (size_t i = 0; i < gMatches.size(); i++) { |
| 48 | const String8& match = gMatches.itemAt(i); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 49 | |
Jeff Brown | 9cf36b7 | 2012-10-10 17:17:58 -0700 | [diff] [blame] | 50 | // Consider all zero-delimited fields of the buffer. |
| 51 | const char* field = buffer; |
Jeff Brown | c51cb89 | 2012-10-11 15:58:49 -0700 | [diff] [blame] | 52 | const char* end = buffer + length + 1; |
Jeff Brown | 9cf36b7 | 2012-10-10 17:17:58 -0700 | [diff] [blame] | 53 | do { |
| 54 | if (strstr(field, match.string())) { |
| 55 | ALOGV("Matched uevent message with pattern: %s", match.string()); |
| 56 | return true; |
| 57 | } |
| 58 | field += strlen(field) + 1; |
| 59 | } while (field != end); |
| 60 | } |
| 61 | return false; |
| 62 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 63 | |
Jeff Brown | 9cf36b7 | 2012-10-10 17:17:58 -0700 | [diff] [blame] | 64 | static jstring nativeWaitForNextEvent(JNIEnv *env, jclass clazz) { |
| 65 | char buffer[1024]; |
| 66 | |
| 67 | for (;;) { |
| 68 | int length = uevent_next_event(buffer, sizeof(buffer) - 1); |
| 69 | if (length <= 0) { |
| 70 | return NULL; |
| 71 | } |
| 72 | buffer[length] = '\0'; |
| 73 | |
| 74 | ALOGV("Received uevent message: %s", buffer); |
| 75 | |
| 76 | if (isMatch(buffer, length)) { |
| 77 | // Assume the message is ASCII. |
| 78 | jchar message[length]; |
| 79 | for (int i = 0; i < length; i++) { |
| 80 | message[i] = buffer[i]; |
| 81 | } |
| 82 | return env->NewString(message, length); |
| 83 | } |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | static void nativeAddMatch(JNIEnv* env, jclass clazz, jstring matchStr) { |
| 88 | ScopedUtfChars match(env, matchStr); |
| 89 | |
| 90 | AutoMutex _l(gMatchesMutex); |
| 91 | gMatches.add(String8(match.c_str())); |
| 92 | } |
| 93 | |
| 94 | static void nativeRemoveMatch(JNIEnv* env, jclass clazz, jstring matchStr) { |
| 95 | ScopedUtfChars match(env, matchStr); |
| 96 | |
| 97 | AutoMutex _l(gMatchesMutex); |
| 98 | for (size_t i = 0; i < gMatches.size(); i++) { |
| 99 | if (gMatches.itemAt(i) == match.c_str()) { |
| 100 | gMatches.removeAt(i); |
| 101 | break; // only remove first occurrence |
| 102 | } |
| 103 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 104 | } |
| 105 | |
Daniel Micay | 76f6a86 | 2015-09-19 17:31:01 -0400 | [diff] [blame] | 106 | static const JNINativeMethod gMethods[] = { |
Jeff Brown | 9cf36b7 | 2012-10-10 17:17:58 -0700 | [diff] [blame] | 107 | { "nativeSetup", "()V", |
| 108 | (void *)nativeSetup }, |
| 109 | { "nativeWaitForNextEvent", "()Ljava/lang/String;", |
| 110 | (void *)nativeWaitForNextEvent }, |
| 111 | { "nativeAddMatch", "(Ljava/lang/String;)V", |
| 112 | (void *)nativeAddMatch }, |
| 113 | { "nativeRemoveMatch", "(Ljava/lang/String;)V", |
| 114 | (void *)nativeRemoveMatch }, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 115 | }; |
| 116 | |
| 117 | |
| 118 | int register_android_os_UEventObserver(JNIEnv *env) |
| 119 | { |
Andreas Gampe | ed6b9df | 2014-11-20 22:02:20 -0800 | [diff] [blame] | 120 | FindClassOrDie(env, "android/os/UEventObserver"); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 121 | |
Andreas Gampe | ed6b9df | 2014-11-20 22:02:20 -0800 | [diff] [blame] | 122 | return RegisterMethodsOrDie(env, "android/os/UEventObserver", gMethods, NELEM(gMethods)); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 123 | } |
| 124 | |
| 125 | } // namespace android |