java_lang_System.cpp revision 7757924895a28a43ab9f7c3931cc9f972e870ddc
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 37static 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. 62static 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 76static 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 88static 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 95static jlong System_nanoTime(JNIEnv*, jclass) { 96 timespec now; 97#ifdef CLOCK_MONOTONIC_RAW 98 clock_gettime(CLOCK_MONOTONIC_RAW, &now); 99#else // Darwin, say. 100 clock_gettime(CLOCK_MONOTONIC, &now); 101#endif 102 return now.tv_sec * 1000000000LL + now.tv_nsec; 103} 104 105static jstring System_mapLibraryName(JNIEnv* env, jclass, jstring javaName) { 106 ScopedUtfChars name(env, javaName); 107 if (name.c_str() == NULL) { 108 return NULL; 109 } 110 char* mappedName = NULL; 111 asprintf(&mappedName, OS_SHARED_LIB_FORMAT_STR, name.c_str()); 112 jstring result = env->NewStringUTF(mappedName); 113 free(mappedName); 114 return result; 115} 116 117static JNINativeMethod gMethods[] = { 118 NATIVE_METHOD(System, currentTimeMillis, "()J"), 119 NATIVE_METHOD(System, log, "(CLjava/lang/String;Ljava/lang/Throwable;)V"), 120 NATIVE_METHOD(System, mapLibraryName, "(Ljava/lang/String;)Ljava/lang/String;"), 121 NATIVE_METHOD(System, nanoTime, "()J"), 122 NATIVE_METHOD(System, setFieldImpl, "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/Object;)V"), 123 NATIVE_METHOD(System, specialProperties, "()[Ljava/lang/String;"), 124}; 125void register_java_lang_System(JNIEnv* env) { 126 jniRegisterNativeMethods(env, "java/lang/System", gMethods, NELEM(gMethods)); 127} 128