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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 "System"
     18 
     19 #include "JNIHelp.h"
     20 #include "JniConstants.h"
     21 #include "ScopedUtfChars.h"
     22 #include "cutils/log.h"
     23 #include "openssl/opensslv.h"
     24 #include "toStringArray.h"
     25 #include "zlib.h"
     26 
     27 #include <string>
     28 #include <vector>
     29 
     30 #include <limits.h>
     31 #include <stdlib.h>
     32 #include <string.h>
     33 #include <unistd.h>
     34 
     35 static void System_log(JNIEnv* env, jclass, jchar type, jstring javaMessage, jthrowable exception) {
     36     ScopedUtfChars message(env, javaMessage);
     37     if (message.c_str() == NULL) {
     38         // Since this function is used for last-gasp debugging output, be noisy on failure.
     39         ALOGE("message.c_str() == NULL");
     40         return;
     41     }
     42     int priority;
     43     switch (type) {
     44     case 'D': case 'd': priority = ANDROID_LOG_DEBUG;   break;
     45     case 'E': case 'e': priority = ANDROID_LOG_ERROR;   break;
     46     case 'F': case 'f': priority = ANDROID_LOG_FATAL;   break;
     47     case 'I': case 'i': priority = ANDROID_LOG_INFO;    break;
     48     case 'S': case 's': priority = ANDROID_LOG_SILENT;  break;
     49     case 'V': case 'v': priority = ANDROID_LOG_VERBOSE; break;
     50     case 'W': case 'w': priority = ANDROID_LOG_WARN;    break;
     51     default:            priority = ANDROID_LOG_DEFAULT; break;
     52     }
     53     LOG_PRI(priority, LOG_TAG, "%s", message.c_str());
     54     if (exception != NULL) {
     55         jniLogException(env, priority, LOG_TAG, exception);
     56     }
     57 }
     58 
     59 // Sets a field via JNI. Used for the standard streams, which are read-only otherwise.
     60 static void System_setFieldImpl(JNIEnv* env, jclass clazz,
     61         jstring javaName, jstring javaSignature, jobject object) {
     62     ScopedUtfChars name(env, javaName);
     63     if (name.c_str() == NULL) {
     64         return;
     65     }
     66     ScopedUtfChars signature(env, javaSignature);
     67     if (signature.c_str() == NULL) {
     68         return;
     69     }
     70     jfieldID fieldID = env->GetStaticFieldID(clazz, name.c_str(), signature.c_str());
     71     env->SetStaticObjectField(clazz, fieldID, object);
     72 }
     73 
     74 static jobjectArray System_specialProperties(JNIEnv* env, jclass) {
     75     std::vector<std::string> properties;
     76 
     77     char path[PATH_MAX];
     78     properties.push_back(std::string("user.dir=") + getcwd(path, sizeof(path)));
     79 
     80     properties.push_back("android.zlib.version=" ZLIB_VERSION);
     81     properties.push_back("android.openssl.version=" OPENSSL_VERSION_TEXT);
     82 
     83     return toStringArray(env, properties);
     84 }
     85 
     86 static JNINativeMethod gMethods[] = {
     87     NATIVE_METHOD(System, log, "(CLjava/lang/String;Ljava/lang/Throwable;)V"),
     88     NATIVE_METHOD(System, setFieldImpl, "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/Object;)V"),
     89     NATIVE_METHOD(System, specialProperties, "()[Ljava/lang/String;"),
     90 };
     91 void register_java_lang_System(JNIEnv* env) {
     92     jniRegisterNativeMethods(env, "java/lang/System", gMethods, NELEM(gMethods));
     93 }
     94