1 /* 2 * Copyright (C) 2014 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 "FileDescriptor" 18 19 #include "JniConstants.h" 20 21 #include <sys/socket.h> 22 #include <sys/types.h> 23 24 static jboolean FileDescriptor_isSocket(JNIEnv*, jclass, jint fd) { 25 // If getsockopt succeeds, we know we're dealing with a socket. 26 // This is the cheapest way we know of to test whether an fd is a socket. 27 int option; 28 socklen_t option_length = sizeof(option); 29 return TEMP_FAILURE_RETRY(getsockopt(fd, SOL_SOCKET, SO_DEBUG, &option, &option_length)) == 0; 30 } 31 32 static JNINativeMethod gMethods[] = { 33 NATIVE_METHOD(FileDescriptor, isSocket, "(I)Z"), 34 }; 35 void register_java_io_FileDescriptor(JNIEnv* env) { 36 jniRegisterNativeMethods(env, "java/io/FileDescriptor", gMethods, NELEM(gMethods)); 37 } 38
