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      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"
     18 #include "utils/Log.h"
     19 
     20 #include "hardware_legacy/uevent.h"
     21 #include "jni.h"
     22 #include "JNIHelp.h"
     23 #include "android_runtime/AndroidRuntime.h"
     24 
     25 namespace android
     26 {
     27 
     28 static void
     29 android_os_UEventObserver_native_setup(JNIEnv *env, jclass clazz)
     30 {
     31     if (!uevent_init()) {
     32         jniThrowException(env, "java/lang/RuntimeException",
     33                           "Unable to open socket for UEventObserver");
     34     }
     35 }
     36 
     37 static int
     38 android_os_UEventObserver_next_event(JNIEnv *env, jclass clazz, jbyteArray jbuffer)
     39 {
     40     int buf_sz = env->GetArrayLength(jbuffer);
     41     char *buffer = (char*)env->GetByteArrayElements(jbuffer, NULL);
     42 
     43     int length = uevent_next_event(buffer, buf_sz - 1);
     44 
     45     env->ReleaseByteArrayElements(jbuffer, (jbyte*)buffer, 0);
     46 
     47     return length;
     48 }
     49 
     50 static JNINativeMethod gMethods[] = {
     51     {"native_setup", "()V",   (void *)android_os_UEventObserver_native_setup},
     52     {"next_event",   "([B)I", (void *)android_os_UEventObserver_next_event},
     53 };
     54 
     55 
     56 int register_android_os_UEventObserver(JNIEnv *env)
     57 {
     58     jclass clazz;
     59 
     60     clazz = env->FindClass("android/os/UEventObserver");
     61     if (clazz == NULL) {
     62         ALOGE("Can't find android/os/UEventObserver");
     63         return -1;
     64     }
     65 
     66     return AndroidRuntime::registerNativeMethods(env,
     67                 "android/os/UEventObserver", gMethods, NELEM(gMethods));
     68 }
     69 
     70 }   // namespace android
     71