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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 <sys/time.h>
     34 #include <time.h>
     35 #include <unistd.h>
     36 
     37 static void System_log(JNIEnv* env, jclass, jchar type, jstring javaMessage, jthrowable exception) {
     38     ScopedUtfChars message(env, javaMessage);
     39     if (message.c_str() == NULL) {
     40         // Since this function is used for last-gasp debugging output, be noisy on failure.
     41         ALOGE("message.c_str() == NULL");
     42         return;
     43     }
     44     int priority;
     45     switch (type) {
     46     case 'D': case 'd': priority = ANDROID_LOG_DEBUG;   break;
     47     case 'E': case 'e': priority = ANDROID_LOG_ERROR;   break;
     48     case 'F': case 'f': priority = ANDROID_LOG_FATAL;   break;
     49     case 'I': case 'i': priority = ANDROID_LOG_INFO;    break;
     50     case 'S': case 's': priority = ANDROID_LOG_SILENT;  break;
     51     case 'V': case 'v': priority = ANDROID_LOG_VERBOSE; break;
     52     case 'W': case 'w': priority = ANDROID_LOG_WARN;    break;
     53     default:            priority = ANDROID_LOG_DEFAULT; break;
     54     }
     55     LOG_PRI(priority, LOG_TAG, "%s", message.c_str());
     56     if (exception != NULL) {
     57         jniLogException(env, priority, LOG_TAG, exception);
     58     }
     59 }
     60 
     61 // Sets a field via JNI. Used for the standard streams, which are read-only otherwise.
     62 static void System_setFieldImpl(JNIEnv* env, jclass clazz,
     63         jstring javaName, jstring javaSignature, jobject object) {
     64     ScopedUtfChars name(env, javaName);
     65     if (name.c_str() == NULL) {
     66         return;
     67     }
     68     ScopedUtfChars signature(env, javaSignature);
     69     if (signature.c_str() == NULL) {
     70         return;
     71     }
     72     jfieldID fieldID = env->GetStaticFieldID(clazz, name.c_str(), signature.c_str());
     73     env->SetStaticObjectField(clazz, fieldID, object);
     74 }
     75 
     76 static jobjectArray System_specialProperties(JNIEnv* env, jclass) {
     77     std::vector<std::string> properties;
     78 
     79     char path[PATH_MAX];
     80     properties.push_back(std::string("user.dir=") + getcwd(path, sizeof(path)));
     81 
     82     properties.push_back("android.zlib.version=" ZLIB_VERSION);
     83     properties.push_back("android.openssl.version=" OPENSSL_VERSION_TEXT);
     84 
     85     return toStringArray(env, properties);
     86 }
     87 
     88 static jlong System_currentTimeMillis(JNIEnv*, jclass) {
     89     timeval now;
     90     gettimeofday(&now, NULL);
     91     jlong when = now.tv_sec * 1000LL + now.tv_usec / 1000;
     92     return when;
     93 }
     94 
     95 static jlong System_nanoTime(JNIEnv*, jclass) {
     96     timespec now;
     97     clock_gettime(CLOCK_MONOTONIC, &now);
     98     return now.tv_sec * 1000000000LL + now.tv_nsec;
     99 }
    100 
    101 static jstring System_mapLibraryName(JNIEnv* env, jclass, jstring javaName) {
    102     ScopedUtfChars name(env, javaName);
    103     if (name.c_str() == NULL) {
    104         return NULL;
    105     }
    106     char* mappedName = NULL;
    107     asprintf(&mappedName, OS_SHARED_LIB_FORMAT_STR, name.c_str());
    108     jstring result = env->NewStringUTF(mappedName);
    109     free(mappedName);
    110     return result;
    111 }
    112 
    113 static JNINativeMethod gMethods[] = {
    114     NATIVE_METHOD(System, currentTimeMillis, "()J"),
    115     NATIVE_METHOD(System, log, "(CLjava/lang/String;Ljava/lang/Throwable;)V"),
    116     NATIVE_METHOD(System, mapLibraryName, "(Ljava/lang/String;)Ljava/lang/String;"),
    117     NATIVE_METHOD(System, nanoTime, "()J"),
    118     NATIVE_METHOD(System, setFieldImpl, "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/Object;)V"),
    119     NATIVE_METHOD(System, specialProperties, "()[Ljava/lang/String;"),
    120 };
    121 void register_java_lang_System(JNIEnv* env) {
    122     jniRegisterNativeMethods(env, "java/lang/System", gMethods, NELEM(gMethods));
    123 }
    124