1 /* 2 * Copyright (C) 2010 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 #ifndef NET_FD_H_included 18 #define NET_FD_H_included 19 20 #include "Errors.h" 21 #include "JniUtil.h" 22 23 /** 24 * Wraps access to the int inside a java.io.FileDescriptor, taking care of throwing exceptions. 25 */ 26 class NetFd { 27 public: NetFd(JNIEnv * env,jobject fileDescriptor)28 NetFd(JNIEnv* env, jobject fileDescriptor) 29 : mEnv(env), mFileDescriptor(fileDescriptor), mFd(-1) {} 30 isClosed()31 bool isClosed() { 32 mFd = conscrypt::JniUtil::jniGetFDFromFileDescriptor(mEnv, mFileDescriptor); 33 bool closed = (mFd == -1); 34 if (closed) { 35 conscrypt::Errors::jniThrowException(mEnv, "java/net/SocketException", "Socket closed"); 36 } 37 return closed; 38 } 39 get()40 int get() const { 41 return mFd; 42 } 43 44 private: 45 JNIEnv* mEnv; 46 jobject mFileDescriptor; 47 int mFd; 48 49 // Disallow copy and assignment. 50 NetFd(const NetFd&); 51 void operator=(const NetFd&); 52 }; 53 54 /** 55 * Used to retry syscalls that can return EINTR. This differs from TEMP_FAILURE_RETRY in that 56 * it also considers the case where the reason for failure is that another thread called 57 * Socket.close. 58 */ 59 #define NET_FAILURE_RETRY(fd, exp) \ 60 ({ \ 61 typeof(exp) _rc; \ 62 do { \ 63 _rc = (exp); \ 64 if (_rc == -1) { \ 65 if (fd.isClosed() || errno != EINTR) { \ 66 break; \ 67 } \ 68 } \ 69 } while (_rc == -1); \ 70 _rc; \ 71 }) 72 73 #endif // NET_FD_H_included 74