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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 #if defined(HAVE_ANDROID_OS)
     38 extern "C" void android_get_LD_LIBRARY_PATH(char*, size_t);
     39 #endif
     40 
     41 static void System_log(JNIEnv* env, jclass, jchar type, jstring javaMessage, jthrowable exception) {
     42     ScopedUtfChars message(env, javaMessage);
     43     if (message.c_str() == NULL) {
     44         // Since this function is used for last-gasp debugging output, be noisy on failure.
     45         ALOGE("message.c_str() == NULL");
     46         return;
     47     }
     48     int priority;
     49     switch (type) {
     50     case 'D': case 'd': priority = ANDROID_LOG_DEBUG;   break;
     51     case 'E': case 'e': priority = ANDROID_LOG_ERROR;   break;
     52     case 'F': case 'f': priority = ANDROID_LOG_FATAL;   break;
     53     case 'I': case 'i': priority = ANDROID_LOG_INFO;    break;
     54     case 'S': case 's': priority = ANDROID_LOG_SILENT;  break;
     55     case 'V': case 'v': priority = ANDROID_LOG_VERBOSE; break;
     56     case 'W': case 'w': priority = ANDROID_LOG_WARN;    break;
     57     default:            priority = ANDROID_LOG_DEFAULT; break;
     58     }
     59     LOG_PRI(priority, LOG_TAG, "%s", message.c_str());
     60     if (exception != NULL) {
     61         jniLogException(env, priority, LOG_TAG, exception);
     62     }
     63 }
     64 
     65 // Sets a field via JNI. Used for the standard streams, which are read-only otherwise.
     66 static void System_setFieldImpl(JNIEnv* env, jclass clazz,
     67         jstring javaName, jstring javaSignature, jobject object) {
     68     ScopedUtfChars name(env, javaName);
     69     if (name.c_str() == NULL) {
     70         return;
     71     }
     72     ScopedUtfChars signature(env, javaSignature);
     73     if (signature.c_str() == NULL) {
     74         return;
     75     }
     76     jfieldID fieldID = env->GetStaticFieldID(clazz, name.c_str(), signature.c_str());
     77     env->SetStaticObjectField(clazz, fieldID, object);
     78 }
     79 
     80 static jobjectArray System_specialProperties(JNIEnv* env, jclass) {
     81     std::vector<std::string> properties;
     82 
     83     char path[PATH_MAX];
     84     properties.push_back(std::string("user.dir=") + getcwd(path, sizeof(path)));
     85 
     86     properties.push_back("android.zlib.version=" ZLIB_VERSION);
     87 #if defined(OPENSSL_IS_BORINGSSL)
     88     properties.push_back("android.openssl.version=BoringSSL");
     89 #else
     90     properties.push_back("android.openssl.version=" OPENSSL_VERSION_TEXT);
     91 #endif
     92 
     93     const char* library_path = getenv("LD_LIBRARY_PATH");
     94 #if defined(HAVE_ANDROID_OS)
     95     if (library_path == NULL) {
     96         android_get_LD_LIBRARY_PATH(path, sizeof(path));
     97         library_path = path;
     98     }
     99 #endif
    100     if (library_path == NULL) {
    101         library_path = "";
    102     }
    103     properties.push_back(std::string("java.library.path=") + library_path);
    104 
    105     return toStringArray(env, properties);
    106 }
    107 
    108 static jlong System_currentTimeMillis(JNIEnv*, jclass) {
    109     timeval now;
    110     gettimeofday(&now, NULL);
    111     jlong when = now.tv_sec * 1000LL + now.tv_usec / 1000;
    112     return when;
    113 }
    114 
    115 static jlong System_nanoTime(JNIEnv*, jclass) {
    116 #if defined(__linux__)
    117     timespec now;
    118     clock_gettime(CLOCK_MONOTONIC, &now);
    119     return now.tv_sec * 1000000000LL + now.tv_nsec;
    120 #else // __APPLE__
    121     timeval now;
    122     gettimeofday(&now, NULL);
    123     return static_cast<jlong>(now.tv_sec) * 1000000000LL + now.tv_usec * 1000LL;
    124 #endif
    125 }
    126 
    127 static JNINativeMethod gMethods[] = {
    128     NATIVE_METHOD(System, currentTimeMillis, "!()J"),
    129     NATIVE_METHOD(System, log, "(CLjava/lang/String;Ljava/lang/Throwable;)V"),
    130     NATIVE_METHOD(System, nanoTime, "!()J"),
    131     NATIVE_METHOD(System, setFieldImpl, "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/Object;)V"),
    132     NATIVE_METHOD(System, specialProperties, "()[Ljava/lang/String;"),
    133 };
    134 void register_java_lang_System(JNIEnv* env) {
    135     jniRegisterNativeMethods(env, "java/lang/System", gMethods, NELEM(gMethods));
    136 }
    137