| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "UEventObserver" |
| //#define LOG_NDEBUG 0 |
| |
| #include "utils/Log.h" |
| |
| #include "hardware_legacy/uevent.h" |
| #include "jni.h" |
| #include <nativehelper/JNIHelp.h> |
| #include "core_jni_helpers.h" |
| |
| #include <utils/Mutex.h> |
| #include <utils/Vector.h> |
| #include <utils/String8.h> |
| #include <nativehelper/ScopedUtfChars.h> |
| |
| namespace android { |
| |
| static Mutex gMatchesMutex; |
| static Vector<String8> gMatches; |
| |
| static void nativeSetup(JNIEnv *env, jclass clazz) { |
| if (!uevent_init()) { |
| jniThrowException(env, "java/lang/RuntimeException", |
| "Unable to open socket for UEventObserver"); |
| } |
| } |
| |
| static bool isMatch(const char* buffer, size_t length) { |
| AutoMutex _l(gMatchesMutex); |
| |
| for (size_t i = 0; i < gMatches.size(); i++) { |
| const String8& match = gMatches.itemAt(i); |
| |
| // Consider all zero-delimited fields of the buffer. |
| const char* field = buffer; |
| const char* end = buffer + length + 1; |
| do { |
| if (strstr(field, match.string())) { |
| ALOGV("Matched uevent message with pattern: %s", match.string()); |
| return true; |
| } |
| field += strlen(field) + 1; |
| } while (field != end); |
| } |
| return false; |
| } |
| |
| static jstring nativeWaitForNextEvent(JNIEnv *env, jclass clazz) { |
| char buffer[1024]; |
| |
| for (;;) { |
| int length = uevent_next_event(buffer, sizeof(buffer) - 1); |
| if (length <= 0) { |
| return NULL; |
| } |
| buffer[length] = '\0'; |
| |
| ALOGV("Received uevent message: %s", buffer); |
| |
| if (isMatch(buffer, length)) { |
| // Assume the message is ASCII. |
| jchar message[length]; |
| for (int i = 0; i < length; i++) { |
| message[i] = buffer[i]; |
| } |
| return env->NewString(message, length); |
| } |
| } |
| } |
| |
| static void nativeAddMatch(JNIEnv* env, jclass clazz, jstring matchStr) { |
| ScopedUtfChars match(env, matchStr); |
| |
| AutoMutex _l(gMatchesMutex); |
| gMatches.add(String8(match.c_str())); |
| } |
| |
| static void nativeRemoveMatch(JNIEnv* env, jclass clazz, jstring matchStr) { |
| ScopedUtfChars match(env, matchStr); |
| |
| AutoMutex _l(gMatchesMutex); |
| for (size_t i = 0; i < gMatches.size(); i++) { |
| if (gMatches.itemAt(i) == match.c_str()) { |
| gMatches.removeAt(i); |
| break; // only remove first occurrence |
| } |
| } |
| } |
| |
| static const JNINativeMethod gMethods[] = { |
| { "nativeSetup", "()V", |
| (void *)nativeSetup }, |
| { "nativeWaitForNextEvent", "()Ljava/lang/String;", |
| (void *)nativeWaitForNextEvent }, |
| { "nativeAddMatch", "(Ljava/lang/String;)V", |
| (void *)nativeAddMatch }, |
| { "nativeRemoveMatch", "(Ljava/lang/String;)V", |
| (void *)nativeRemoveMatch }, |
| }; |
| |
| |
| int register_android_os_UEventObserver(JNIEnv *env) |
| { |
| FindClassOrDie(env, "android/os/UEventObserver"); |
| |
| return RegisterMethodsOrDie(env, "android/os/UEventObserver", gMethods, NELEM(gMethods)); |
| } |
| |
| } // namespace android |