Home | History | Annotate | Download | only in jni 
      1 /*
      2  * Copyright (C) 2011 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 "SerialServiceJNI"
     18 #include "utils/Log.h"
     19 
     20 #include "jni.h"
     21 #include <nativehelper/JNIHelp.h>
     22 #include "android_runtime/AndroidRuntime.h"
     23 
     24 #include <sys/types.h>
     25 #include <sys/stat.h>
     26 #include <fcntl.h>
     27 
     28 namespace android
     29 {
     30 
     31 static struct parcel_file_descriptor_offsets_t
     32 {
     33     jclass mClass;
     34     jmethodID mConstructor;
     35 } gParcelFileDescriptorOffsets;
     36 
     37 static jobject android_server_SerialService_open(JNIEnv *env, jobject /* thiz */, jstring path)
     38 {
     39     const char *pathStr = env->GetStringUTFChars(path, NULL);
     40 
     41     int fd = open(pathStr, O_RDWR | O_NOCTTY);
     42     if (fd < 0) {
     43         ALOGE("could not open %s", pathStr);
     44         env->ReleaseStringUTFChars(path, pathStr);
     45         return NULL;
     46     }
     47     env->ReleaseStringUTFChars(path, pathStr);
     48 
     49     jobject fileDescriptor = jniCreateFileDescriptor(env, fd);
     50     if (fileDescriptor == NULL) {
     51         return NULL;
     52     }
     53     return env->NewObject(gParcelFileDescriptorOffsets.mClass,
     54         gParcelFileDescriptorOffsets.mConstructor, fileDescriptor);
     55 }
     56 
     57 
     58 static const JNINativeMethod method_table[] = {
     59     { "native_open",                "(Ljava/lang/String;)Landroid/os/ParcelFileDescriptor;",
     60                                     (void*)android_server_SerialService_open },
     61 };
     62 
     63 int register_android_server_SerialService(JNIEnv *env)
     64 {
     65     jclass clazz = env->FindClass("com/android/server/SerialService");
     66     if (clazz == NULL) {
     67         ALOGE("Can't find com/android/server/SerialService");
     68         return -1;
     69     }
     70 
     71     clazz = env->FindClass("android/os/ParcelFileDescriptor");
     72     LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
     73     gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
     74     gParcelFileDescriptorOffsets.mConstructor = env->GetMethodID(clazz, "<init>", "(Ljava/io/FileDescriptor;)V");
     75     LOG_FATAL_IF(gParcelFileDescriptorOffsets.mConstructor == NULL,
     76                  "Unable to find constructor for android.os.ParcelFileDescriptor");
     77 
     78     return jniRegisterNativeMethods(env, "com/android/server/SerialService",
     79             method_table, NELEM(method_table));
     80 }
     81 
     82 };
     83