| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "AndroidSystemNatives.h" |
| #include "JNIHelp.h" |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| |
| /* |
| * public static native String getEnvByName(String name) |
| * |
| * (Calling it plain "getenv" might confuse GDB if you try to put a breakpoint |
| * on the libc version.) |
| */ |
| static jstring java_getEnvByName(JNIEnv* env, jclass, jstring nameStr) { |
| jstring valueStr = NULL; |
| |
| if (nameStr != NULL) { |
| const char* name = env->GetStringUTFChars(nameStr, NULL); |
| const char* val = getenv(name); |
| if (val != NULL) { |
| valueStr = env->NewStringUTF(val); |
| } |
| env->ReleaseStringUTFChars(nameStr, name); |
| } else { |
| jniThrowNullPointerException(env, NULL); |
| } |
| |
| return valueStr; |
| } |
| |
| /* |
| * Pointer to complete environment, from Posix. |
| */ |
| extern char** environ; |
| |
| /* |
| * public static native String getEnvByIndex() |
| * |
| * (Calling it plain "getenv" might confuse GDB if you try to put a breakpoint |
| * on the libc version.) |
| */ |
| static jstring java_getEnvByIndex(JNIEnv* env, jclass, jint index) { |
| jstring valueStr = NULL; |
| |
| char* entry = environ[index]; |
| if (entry != NULL) { |
| valueStr = env->NewStringUTF(entry); |
| } |
| |
| return valueStr; |
| } |
| |
| /* |
| * public static native String setFieldImpl() |
| * |
| * Sets a field via JNI. Used for the standard streams, which are r/o |
| * otherwise. |
| */ |
| static void java_setFieldImpl(JNIEnv* env, jclass clazz, |
| jstring name, jstring sig, jobject object) { |
| const char* fieldName = env->GetStringUTFChars(name, NULL); |
| const char* fieldSig = env->GetStringUTFChars(sig, NULL); |
| |
| jfieldID fieldID = env->GetStaticFieldID(clazz, fieldName, fieldSig); |
| env->SetStaticObjectField(clazz, fieldID, object); |
| |
| env->ReleaseStringUTFChars(name, fieldName); |
| env->ReleaseStringUTFChars(sig, fieldSig); |
| } |
| |
| /* |
| * JNI registration |
| */ |
| static JNINativeMethod gMethods[] = { |
| /* name, signature, funcPtr */ |
| { "getEnvByName", "(Ljava/lang/String;)Ljava/lang/String;", (void*) java_getEnvByName }, |
| { "getEnvByIndex", "(I)Ljava/lang/String;", (void*) java_getEnvByIndex }, |
| { "setFieldImpl", "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/Object;)V", (void*) java_setFieldImpl }, |
| }; |
| |
| int register_java_lang_System(JNIEnv* env) { |
| return jniRegisterNativeMethods(env, "java/lang/System", |
| gMethods, NELEM(gMethods)); |
| } |