| /* |
| * 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 "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 clazz, jstring nameStr) |
| { |
| jstring valueStr = NULL; |
| |
| if (nameStr != NULL) { |
| const char* name; |
| const char* val; |
| |
| name = (*env)->GetStringUTFChars(env, nameStr, NULL); |
| val = getenv(name); |
| if (val != NULL) |
| valueStr = (*env)->NewStringUTF(env, val); |
| |
| (*env)->ReleaseStringUTFChars(env, nameStr, name); |
| } else { |
| jniThrowException(env, "java/lang/NullPointerException", 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 clazz, jint index) |
| { |
| jstring valueStr = NULL; |
| |
| char* entry = environ[index]; |
| if (entry != NULL) { |
| valueStr = (*env)->NewStringUTF(env, 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(env, name, NULL); |
| const char* fieldSig = (*env)->GetStringUTFChars(env, sig, NULL); |
| |
| jfieldID fieldID = (*env)->GetStaticFieldID(env, clazz, fieldName, fieldSig); |
| (*env)->SetStaticObjectField(env, clazz, fieldID, object); |
| |
| (*env)->ReleaseStringUTFChars(env, name, fieldName); |
| (*env)->ReleaseStringUTFChars(env, sig, fieldSig); |
| } |
| |
| /* |
| * JNI registration |
| */ |
| static JNINativeMethod gMethods[] = { |
| /* name, signature, funcPtr */ |
| { "getEnvByName", "(Ljava/lang/String;)Ljava/lang/String;", java_getEnvByName }, |
| { "getEnvByIndex", "(I)Ljava/lang/String;", java_getEnvByIndex }, |
| { "setFieldImpl", "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/Object;)V", java_setFieldImpl }, |
| }; |
| |
| int register_java_lang_System(JNIEnv* env) |
| { |
| return jniRegisterNativeMethods(env, "java/lang/System", |
| gMethods, NELEM(gMethods)); |
| } |
| |